En matrise er en gruppe av lignende type elementer som har sammenhengende minneplassering. En matrise er en samling av like-type variabler som er oppgitt med et felles navn.
Denne opplæringen vil kort finne ut hvordan du lagrer verdi i en matrise på de vanligste språkene.
1. C Språk
Alle arrays er den sammenhengende blokken av minneplasseringer. Som standard lagrer den laveste posisjonen til matrisen det første elementet, og den høyeste posisjonen lagret de siste dataene. I C deklareres matrisen ved å spesifisere elementets type og den totale lengden på matrisen som kreves for å lagre dataene.
Syntaks for å deklarere array
type arrayName [ arrSize ];
Syntaks for initialisering for lagring av matriseverdier
ikke noe inngangssignal
double balance[6] = {500.0, 52.0, 63.6, 77.80, 70.10, 80.12}; Eksempel
#include int main () { int n[ 11 ]; /* declaring an array comprising of 11 integers */ int i,j; /* initialize elements of array n to 0 */ for ( i = 0; i <11; 100 i++ ) { n[ i ]="i" + 10; * storing or initializing the array at location with element } result of element's value for (j="0;" j < 11; j++ printf('element stored position [%d]="%d
'," j, n[j] ); return 0; pre> <p> <strong>Output</strong> </p> <pre> Element stored at position [0] = 10 Element stored at position [1] = 11 Element stored at position [2] = 12 Element stored at position [3] = 13 Element stored at position [4] = 14 Element stored at position [5] = 15 Element stored at position [6] = 16 Element stored at position [7] = 17 Element stored at position [8] = 18 Element stored at position [9] = 19 Element stored at position [10] = 20 </pre> <h3>Multidimensional Array in C</h3> <p>In C language, the elements of a 2 D (two-dimensional) array are accessed with the help of subscripts, i.e., the row index number and the column index number of the array.</p> <p> <strong>Syntax for declaring Array</strong> </p> <pre> int val = arr[x][y]; </pre> <p> <strong>Syntax for Initializing Two-Dimensional Arrays</strong> </p> <pre> int a[1][4] = { {4, 4, 2, 1} , /* initializers for row indexed by 0 */ {4, 5, 16, 10} , /* initializers for row indexed by 1 */ {8, 19, 10, 11} /* initializers for row indexed by 2 */ }; </pre> <p> <strong></strong> </p> <pre> #include int main () { /* declaring and initializing the array with 4 rows and 2 columns*/ int arr[4][2] = { {1,0}, {1,2}, {2,4}, {3,6}}; int i, j; /* output each array element's value */ for ( i = 0; i <4; i++ ) { for ( j="0;" < 2; j++ printf(' data stored in 2d array[%d][%d]="%d
'," i,j, arr[i][j] ); } return 0; pre> <p> <strong>Output</strong> </p> <pre> Data stored in 2D array[0][0] = 1 Data stored in 2D array[0][1] = 0 Data stored in 2D array[1][0] = 1 Data stored in 2D array[1][1] = 2 Data stored in 2D array[2][0] = 2 Data stored in 2D array[2][1] = 4 Data stored in 2D array[3][0] = 3 Data stored in 2D array[3][1] = 6 </pre> <h2>2. C++ Language</h2> <p>In C++ language the user needs to specify the element type and total length of array.</p> <p> <strong>Syntax to Declare Array</strong> </p> <pre> type arrName [ arrSize ]; </pre> <p> <strong>Syntax to initialize array</strong> </p> <pre> int arr[] = { 1, 2, 3, 4, 5 } </pre> <p> <strong>Example</strong> </p> <pre> #include using namespace std; int main () { // declaring an array with 4 rows. int arr[4] = {1,7,50,6}; // traversing the output for each array value for ( int i = 0; i <4; i++ ) { cout << 'array at position[' i ']: '; arr[i]<< endl; } return 0; < pre> <p> <strong>Output</strong> </p> <pre> array at position[0]: 1 array at position[1]: 7 array at position[2]: 50 array at position[3]: 6 </pre> <h3>Multidimensional Array</h3> <p>C++ language also enables the Multidimensional arrays.</p> <p> <strong>Syntax for initializing 2D array</strong> </p> <pre> int a[4][3] = { {0, 1, 2} , /* storing data in array for row indexed by 0 */ {42, 25, 62} , /* storing data in array for row indexed by 1 */ {18, 90, 15}, /* storing data in array for row indexed by 2 */ {21, 19, 25}, /* storing data in array for row indexed by 3 */ }; </pre> <p> <strong>Example</strong> </p> <pre> #include using namespace std; int main () { // declaring an array with 4 rows and 2 columns. int arr[4][2] = { {1,0}, {0,2}, {2,3}, {5,6}}; // traversing the output for each array value for ( int i = 0; i <4; i++ ) for ( int j="0;" < 2; j++ { cout << 'array at position[' i '][' ']: '; arr[i][j]<< endl; } return 0; pre> <p> <strong>Output</strong> </p> <pre> array at position[0][0]: 1 array at position[0][1]: 0 array at position[1][0]: 0 array at position[1][1]: 2 array at position[2][0]: 2 array at position[2][1]: 3 array at position[3][0]: 5 array at position[3][1]: 6 </pre> <h2>3. Java</h2> <p>In Java language, Arrays work differently than what they used to do in C or C++ language.</p> <h3>One-Dimensional Arrays:</h3> <p>To declare an array, the user needs to have two primary components: the type and the array's name.</p> <p>The 'Type' refers to the elementary type of a specific array. It determines the data type of all elements that are included in the array. It comprises the array of primitive data types, unlike integers, char, float, double, etc., or it could include the user-defined data types (objects of a class) as well. Therefore, the element type for the array concludes what kind of data the array will contain.</p> <p> <strong>Syntax</strong> </p> <pre> type arr_var_name[]; OR type[] arr_var_name; OR var-name = new type [size]; </pre> <p> <strong>Store values in one-dimensional array</strong> </p> <p>Assigning values to an element in an array is similar to assigning values to scalar variables.</p> <pre> Array [index]= initializers; arr[1]= 50 arr[2]= 20 </pre> <h4>NOTE: It the array element is not assigned any value, by default it has a Null (empty) value.</h4> <p> <strong>Example</strong> </p> <pre> //Java Program to demonstrate how to initialize, store and display //values in one-dimensional arrays. class Testarray{ public static void main(String args[]){ int arr[]=new int[5];//declaration and instantiation arr[0]=20;//initialization of the array arr[1]=40; arr[2]=60; arr[3]=80; arr[4]=100; //traversing array to print the array values for(int i=0;i <arr.length;i++) system.out.println(arr[i]); }} < pre> <p> <strong>Output</strong> </p> <pre> 20 40 60 80 100 </pre> <h3>Arrays of Objects</h3> <p>An array of objects is constructed in the same way as an array of primitive type data elements.</p> <p> <strong>Example</strong> </p> <pre> // Java program to create, store and display values for one-dimensional // array of objects class Employee { public int id_no; public String name; Employee(int id_no, String name) { this.id_no = id_no; this.name = name; } } // The Elements of the array are objects of a class Employee. public class Array_Objects_Example { public static void main (String[] args) { // declares an Array of integers. Employee[] arr; // assigning space for 5 objects of type Employee. arr = new Employee[5]; // storing the value for the first element of the array arr[0] = new Employee(111,'Varun'); // storing the value for the second elements of the array arr[1] = new Employee(121,'Sukla'); // so on... arr[2] = new Employee(131,'Virat'); arr[3] = new Employee(141,'Anuskha'); arr[4] = new Employee(151,'Mohit'); // accessing the elements of the specified array for (int i = 0; i <arr.length; i++) system.out.println('element at ' + i : arr[i].id_no +' '+ arr[i].name); } < pre> <p> <strong>Output</strong> </p> <pre> Element at 0 : 111 Varun Element at 1 : 121 Sukla Element at 2 : 131 Virat Element at 3 : 141 Anuskha Element at 4 : 151 Mohit </pre> <h3>Multidimensional Arrays</h3> <p>Multidimensional arrays are termed 'arrays of arrays' as they can hold each element of an array with the reference of another array. These are also known as Jagged Arrays. A multidimensional array is constructed by adding a set of square brackets ([]) per dimension.</p> <p> <strong>Syntax</strong> </p> <pre> int[][] intArray = new int[10][20]; //a 2D array or matrix int[][][] intArray = new int[10][20][10]; //a 3D array </pre> <p> <strong>Example to store values in a Multidimensional Array</strong> </p> <pre> arry[0][0]=10; arry[0][1]=20; arry[0][2]=30; arry[1][0]=40; arry[1][1]=50; arry[1][3]=60; arry[2][1]=70; arry[2][2]=80; arry[2][3]=90; </pre> <p> <strong>Example of Multidimensional Array</strong> </p> <pre> class multiDimensional_Example { public static void main(String args[]) { // declaring and storing data in 2-Dimensional array int arry[][] = { {12,17,19},{32,62,12},{37,34,32} }; // traversing and printing the 2-Dimensional array for (int i=0; i<3 3 ; i++) { for (int j="0;" < j++) system.out.print(arry[i][j] + ' '); system.out.println(); } pre> <p> <strong>Output</strong> </p> <pre> 12 17 19 32 62 12 37 34 32 </pre> <h2>4. PHP</h2> <p>PHP array is an ordered map (holds elements on the base of the key-value). It is utilized to hold multiple values of a similar data type in a single variable.</p> <p>PHP contains 3 kinds of array that are as follows:</p> <ol class="points"> <li>Indexed Array</li> <li>Associative Array</li> <li>Multidimensional Array</li> </ol> <h3>1. Indexed Array</h3> <p>PHP index is described by an integer number that begins with 0 (default value). The PHP array can store any data type, such as numbers, characters, strings, and objects. All PHP array data are allocated an index number by default.</p> <p> <strong>Syntax to store values</strong> </p> <pre> $Colour =array('Red', 'White', 'Black', 'Yellow'); </pre> <p> <strong>Or</strong> </p> <pre> $Colour[0]='Red '; $Colour[1]='White'; $Colour[2]='Black'; $Colour[3]='Yellow'; </pre> <p> <strong>Example</strong> </p> <pre> </pre> <p> <strong>Output</strong> </p> <pre> Colours are: Red, White, Black, Yellow </pre> <h3>2. Associative Array</h3> <p>In PHP, the user can associate any specific name with each array elements using the '=>' symbol.</p> <p> <strong>Syntax</strong> </p> <pre> $marks =array('Reema'=>'95','John'=>'45','Rahul'=>'20'); </pre> <p> <strong>Or</strong> </p> <pre> $marks['Reema ']='95'; $marks['John']='45'; $marks ['Rahul ']='20'; </pre> <p> <strong>Example</strong> </p> <pre> <?php $marks['Reema ']='95'; $marks['John']='45'; $marks ['Rahul ']='20'; echo 'Reema's Marks: '.$marks ['Reema '].' <br/>'; echo ' John's Marks: '.$marks['John'].' <br>'; echo ' Rahul's Marks: '.$marks ['Rahul '].' <br>'; ?> </pre> <p> <strong>Output</strong> </p> <pre> Reema's Marks: 95 John's Marks: 45 Rahul's Marks: 20 </pre> <h3>3. Multidimensional Array</h3> <p>Multidimensional arrays in PHP are also termed as 'array of arrays'. It enabled the user to store array data in a tabular format. PHP multidimensional array can be expressed in the form of a matrix which is denoted by row * column.</p> <p> <strong>Syntax</strong> </p> <pre> $emp = array ( array (1,'Reema',95), array(2,'john',45), array(3,'rahul',20) ); </pre> <p> <strong>Example</strong> </p> <pre> <?php $emp = array ( array (1,'Reema',95), array(2,'john',45), array(3,'rahul',20) ); for ($row = 0; $row < 3; $row++) { for ($col = 0; $col < 3; $col++) { echo $emp[$row][$col].' '; } echo ' <br/>'; } ?> </pre> <p> <strong>Output</strong> </p> <pre> 1 Reema 95 2 john 45 3 rahul 20 </pre> <h2>5. Python</h2> <p>Python uses a module named 'Array' to handle all the functions of Arrays in Python. It is helpful when the user wants to manipulate only particular data values. Given below are the keywords that are important to learn the concept of an array in Python:</p> <ul> <li>Element - Any data stored in an array is known an element.</li> <li>Index - Whenever an array stores any data, it has some numerical location known as index that is beneficial to identify the location of the element.</li> </ul> <p> <strong>Syntax</strong> </p> <pre> from array import * arrayName = array(typecode, [data_to_be_initialized]) </pre> <p> <strong>Example</strong> </p> <pre> import array as arry n = arry.array('i', [20, 40, 60, 80]) print('First array value:', n[0]) print('Second array value:', n[1]) print('Second last array value:', n[-1]) </pre> <p> <strong>Output</strong> </p> <pre> First array value: 20 Second array value: 40 Second last array value: 80 </pre> <hr></3></pre></arr.length;></pre></arr.length;i++)></pre></4;></pre></4;></pre></4;></pre></11;> Flerdimensjonal matrise i C
I C-språket får man tilgang til elementene i en 2D (to-dimensjonal) matrise ved hjelp av subscripts, dvs. radindeksnummeret og kolonneindeksnummeret til matrisen.
Syntaks for å deklarere Array
int val = arr[x][y];
Syntaks for initialisering av todimensjonale matriser
int a[1][4] = { {4, 4, 2, 1} , /* initializers for row indexed by 0 */ {4, 5, 16, 10} , /* initializers for row indexed by 1 */ {8, 19, 10, 11} /* initializers for row indexed by 2 */ };
#include int main () { /* declaring and initializing the array with 4 rows and 2 columns*/ int arr[4][2] = { {1,0}, {1,2}, {2,4}, {3,6}}; int i, j; /* output each array element's value */ for ( i = 0; i <4; i++ ) { for ( j="0;" < 2; j++ printf(\' data stored in 2d array[%d][%d]="%d
'," i,j, arr[i][j] ); } return 0; pre> <p> <strong>Output</strong> </p> <pre> Data stored in 2D array[0][0] = 1 Data stored in 2D array[0][1] = 0 Data stored in 2D array[1][0] = 1 Data stored in 2D array[1][1] = 2 Data stored in 2D array[2][0] = 2 Data stored in 2D array[2][1] = 4 Data stored in 2D array[3][0] = 3 Data stored in 2D array[3][1] = 6 </pre> <h2>2. C++ Language</h2> <p>In C++ language the user needs to specify the element type and total length of array.</p> <p> <strong>Syntax to Declare Array</strong> </p> <pre> type arrName [ arrSize ]; </pre> <p> <strong>Syntax to initialize array</strong> </p> <pre> int arr[] = { 1, 2, 3, 4, 5 } </pre> <p> <strong>Example</strong> </p> <pre> #include using namespace std; int main () { // declaring an array with 4 rows. int arr[4] = {1,7,50,6}; // traversing the output for each array value for ( int i = 0; i <4; i++ ) { cout << \'array at position[\' i \']: \'; arr[i]<< endl; } return 0; < pre> <p> <strong>Output</strong> </p> <pre> array at position[0]: 1 array at position[1]: 7 array at position[2]: 50 array at position[3]: 6 </pre> <h3>Multidimensional Array</h3> <p>C++ language also enables the Multidimensional arrays.</p> <p> <strong>Syntax for initializing 2D array</strong> </p> <pre> int a[4][3] = { {0, 1, 2} , /* storing data in array for row indexed by 0 */ {42, 25, 62} , /* storing data in array for row indexed by 1 */ {18, 90, 15}, /* storing data in array for row indexed by 2 */ {21, 19, 25}, /* storing data in array for row indexed by 3 */ }; </pre> <p> <strong>Example</strong> </p> <pre> #include using namespace std; int main () { // declaring an array with 4 rows and 2 columns. int arr[4][2] = { {1,0}, {0,2}, {2,3}, {5,6}}; // traversing the output for each array value for ( int i = 0; i <4; i++ ) for ( int j="0;" < 2; j++ { cout << \'array at position[\' i \'][\' \']: \'; arr[i][j]<< endl; } return 0; pre> <p> <strong>Output</strong> </p> <pre> array at position[0][0]: 1 array at position[0][1]: 0 array at position[1][0]: 0 array at position[1][1]: 2 array at position[2][0]: 2 array at position[2][1]: 3 array at position[3][0]: 5 array at position[3][1]: 6 </pre> <h2>3. Java</h2> <p>In Java language, Arrays work differently than what they used to do in C or C++ language.</p> <h3>One-Dimensional Arrays:</h3> <p>To declare an array, the user needs to have two primary components: the type and the array's name.</p> <p>The 'Type' refers to the elementary type of a specific array. It determines the data type of all elements that are included in the array. It comprises the array of primitive data types, unlike integers, char, float, double, etc., or it could include the user-defined data types (objects of a class) as well. Therefore, the element type for the array concludes what kind of data the array will contain.</p> <p> <strong>Syntax</strong> </p> <pre> type arr_var_name[]; OR type[] arr_var_name; OR var-name = new type [size]; </pre> <p> <strong>Store values in one-dimensional array</strong> </p> <p>Assigning values to an element in an array is similar to assigning values to scalar variables.</p> <pre> Array [index]= initializers; arr[1]= 50 arr[2]= 20 </pre> <h4>NOTE: It the array element is not assigned any value, by default it has a Null (empty) value.</h4> <p> <strong>Example</strong> </p> <pre> //Java Program to demonstrate how to initialize, store and display //values in one-dimensional arrays. class Testarray{ public static void main(String args[]){ int arr[]=new int[5];//declaration and instantiation arr[0]=20;//initialization of the array arr[1]=40; arr[2]=60; arr[3]=80; arr[4]=100; //traversing array to print the array values for(int i=0;i <arr.length;i++) system.out.println(arr[i]); }} < pre> <p> <strong>Output</strong> </p> <pre> 20 40 60 80 100 </pre> <h3>Arrays of Objects</h3> <p>An array of objects is constructed in the same way as an array of primitive type data elements.</p> <p> <strong>Example</strong> </p> <pre> // Java program to create, store and display values for one-dimensional // array of objects class Employee { public int id_no; public String name; Employee(int id_no, String name) { this.id_no = id_no; this.name = name; } } // The Elements of the array are objects of a class Employee. public class Array_Objects_Example { public static void main (String[] args) { // declares an Array of integers. Employee[] arr; // assigning space for 5 objects of type Employee. arr = new Employee[5]; // storing the value for the first element of the array arr[0] = new Employee(111,'Varun'); // storing the value for the second elements of the array arr[1] = new Employee(121,'Sukla'); // so on... arr[2] = new Employee(131,'Virat'); arr[3] = new Employee(141,'Anuskha'); arr[4] = new Employee(151,'Mohit'); // accessing the elements of the specified array for (int i = 0; i <arr.length; i++) system.out.println(\'element at \' + i : arr[i].id_no +\' \'+ arr[i].name); } < pre> <p> <strong>Output</strong> </p> <pre> Element at 0 : 111 Varun Element at 1 : 121 Sukla Element at 2 : 131 Virat Element at 3 : 141 Anuskha Element at 4 : 151 Mohit </pre> <h3>Multidimensional Arrays</h3> <p>Multidimensional arrays are termed 'arrays of arrays' as they can hold each element of an array with the reference of another array. These are also known as Jagged Arrays. A multidimensional array is constructed by adding a set of square brackets ([]) per dimension.</p> <p> <strong>Syntax</strong> </p> <pre> int[][] intArray = new int[10][20]; //a 2D array or matrix int[][][] intArray = new int[10][20][10]; //a 3D array </pre> <p> <strong>Example to store values in a Multidimensional Array</strong> </p> <pre> arry[0][0]=10; arry[0][1]=20; arry[0][2]=30; arry[1][0]=40; arry[1][1]=50; arry[1][3]=60; arry[2][1]=70; arry[2][2]=80; arry[2][3]=90; </pre> <p> <strong>Example of Multidimensional Array</strong> </p> <pre> class multiDimensional_Example { public static void main(String args[]) { // declaring and storing data in 2-Dimensional array int arry[][] = { {12,17,19},{32,62,12},{37,34,32} }; // traversing and printing the 2-Dimensional array for (int i=0; i<3 3 ; i++) { for (int j="0;" < j++) system.out.print(arry[i][j] + \' \'); system.out.println(); } pre> <p> <strong>Output</strong> </p> <pre> 12 17 19 32 62 12 37 34 32 </pre> <h2>4. PHP</h2> <p>PHP array is an ordered map (holds elements on the base of the key-value). It is utilized to hold multiple values of a similar data type in a single variable.</p> <p>PHP contains 3 kinds of array that are as follows:</p> <ol class="points"> <li>Indexed Array</li> <li>Associative Array</li> <li>Multidimensional Array</li> </ol> <h3>1. Indexed Array</h3> <p>PHP index is described by an integer number that begins with 0 (default value). The PHP array can store any data type, such as numbers, characters, strings, and objects. All PHP array data are allocated an index number by default.</p> <p> <strong>Syntax to store values</strong> </p> <pre> $Colour =array('Red', 'White', 'Black', 'Yellow'); </pre> <p> <strong>Or</strong> </p> <pre> $Colour[0]='Red '; $Colour[1]='White'; $Colour[2]='Black'; $Colour[3]='Yellow'; </pre> <p> <strong>Example</strong> </p> <pre> </pre> <p> <strong>Output</strong> </p> <pre> Colours are: Red, White, Black, Yellow </pre> <h3>2. Associative Array</h3> <p>In PHP, the user can associate any specific name with each array elements using the '=>' symbol.</p> <p> <strong>Syntax</strong> </p> <pre> $marks =array('Reema'=>'95','John'=>'45','Rahul'=>'20'); </pre> <p> <strong>Or</strong> </p> <pre> $marks['Reema ']='95'; $marks['John']='45'; $marks ['Rahul ']='20'; </pre> <p> <strong>Example</strong> </p> <pre> <?php $marks[\'Reema \']=\'95\'; $marks[\'John\']=\'45\'; $marks [\'Rahul \']=\'20\'; echo \'Reema\'s Marks: \'.$marks [\'Reema \'].\' <br/>'; echo ' John's Marks: '.$marks['John'].' <br>'; echo ' Rahul's Marks: '.$marks ['Rahul '].' <br>'; ?> </pre> <p> <strong>Output</strong> </p> <pre> Reema's Marks: 95 John's Marks: 45 Rahul's Marks: 20 </pre> <h3>3. Multidimensional Array</h3> <p>Multidimensional arrays in PHP are also termed as 'array of arrays'. It enabled the user to store array data in a tabular format. PHP multidimensional array can be expressed in the form of a matrix which is denoted by row * column.</p> <p> <strong>Syntax</strong> </p> <pre> $emp = array ( array (1,'Reema',95), array(2,'john',45), array(3,'rahul',20) ); </pre> <p> <strong>Example</strong> </p> <pre> <?php $emp = array ( array (1,\'Reema\',95), array(2,\'john\',45), array(3,\'rahul\',20) ); for ($row = 0; $row < 3; $row++) { for ($col = 0; $col < 3; $col++) { echo $emp[$row][$col].\' \'; } echo \' <br/>'; } ?> </pre> <p> <strong>Output</strong> </p> <pre> 1 Reema 95 2 john 45 3 rahul 20 </pre> <h2>5. Python</h2> <p>Python uses a module named 'Array' to handle all the functions of Arrays in Python. It is helpful when the user wants to manipulate only particular data values. Given below are the keywords that are important to learn the concept of an array in Python:</p> <ul> <li>Element - Any data stored in an array is known an element.</li> <li>Index - Whenever an array stores any data, it has some numerical location known as index that is beneficial to identify the location of the element.</li> </ul> <p> <strong>Syntax</strong> </p> <pre> from array import * arrayName = array(typecode, [data_to_be_initialized]) </pre> <p> <strong>Example</strong> </p> <pre> import array as arry n = arry.array('i', [20, 40, 60, 80]) print('First array value:', n[0]) print('Second array value:', n[1]) print('Second last array value:', n[-1]) </pre> <p> <strong>Output</strong> </p> <pre> First array value: 20 Second array value: 40 Second last array value: 80 </pre> <hr></3></pre></arr.length;></pre></arr.length;i++)></pre></4;></pre></4;></pre></4;> 2. C++-språk
I C++ språk må brukeren spesifisere elementtype og total lengde på array.
Syntaks for å deklarere Array
konverter et java-objekt til json
type arrName [ arrSize ];
Syntaks for å initialisere array
int arr[] = { 1, 2, 3, 4, 5 } Eksempel
#include using namespace std; int main () { // declaring an array with 4 rows. int arr[4] = {1,7,50,6}; // traversing the output for each array value for ( int i = 0; i <4; i++ ) { cout << \'array at position[\' i \']: \'; arr[i]<< endl; } return 0; < pre> <p> <strong>Output</strong> </p> <pre> array at position[0]: 1 array at position[1]: 7 array at position[2]: 50 array at position[3]: 6 </pre> <h3>Multidimensional Array</h3> <p>C++ language also enables the Multidimensional arrays.</p> <p> <strong>Syntax for initializing 2D array</strong> </p> <pre> int a[4][3] = { {0, 1, 2} , /* storing data in array for row indexed by 0 */ {42, 25, 62} , /* storing data in array for row indexed by 1 */ {18, 90, 15}, /* storing data in array for row indexed by 2 */ {21, 19, 25}, /* storing data in array for row indexed by 3 */ }; </pre> <p> <strong>Example</strong> </p> <pre> #include using namespace std; int main () { // declaring an array with 4 rows and 2 columns. int arr[4][2] = { {1,0}, {0,2}, {2,3}, {5,6}}; // traversing the output for each array value for ( int i = 0; i <4; i++ ) for ( int j="0;" < 2; j++ { cout << \'array at position[\' i \'][\' \']: \'; arr[i][j]<< endl; } return 0; pre> <p> <strong>Output</strong> </p> <pre> array at position[0][0]: 1 array at position[0][1]: 0 array at position[1][0]: 0 array at position[1][1]: 2 array at position[2][0]: 2 array at position[2][1]: 3 array at position[3][0]: 5 array at position[3][1]: 6 </pre> <h2>3. Java</h2> <p>In Java language, Arrays work differently than what they used to do in C or C++ language.</p> <h3>One-Dimensional Arrays:</h3> <p>To declare an array, the user needs to have two primary components: the type and the array's name.</p> <p>The 'Type' refers to the elementary type of a specific array. It determines the data type of all elements that are included in the array. It comprises the array of primitive data types, unlike integers, char, float, double, etc., or it could include the user-defined data types (objects of a class) as well. Therefore, the element type for the array concludes what kind of data the array will contain.</p> <p> <strong>Syntax</strong> </p> <pre> type arr_var_name[]; OR type[] arr_var_name; OR var-name = new type [size]; </pre> <p> <strong>Store values in one-dimensional array</strong> </p> <p>Assigning values to an element in an array is similar to assigning values to scalar variables.</p> <pre> Array [index]= initializers; arr[1]= 50 arr[2]= 20 </pre> <h4>NOTE: It the array element is not assigned any value, by default it has a Null (empty) value.</h4> <p> <strong>Example</strong> </p> <pre> //Java Program to demonstrate how to initialize, store and display //values in one-dimensional arrays. class Testarray{ public static void main(String args[]){ int arr[]=new int[5];//declaration and instantiation arr[0]=20;//initialization of the array arr[1]=40; arr[2]=60; arr[3]=80; arr[4]=100; //traversing array to print the array values for(int i=0;i <arr.length;i++) system.out.println(arr[i]); }} < pre> <p> <strong>Output</strong> </p> <pre> 20 40 60 80 100 </pre> <h3>Arrays of Objects</h3> <p>An array of objects is constructed in the same way as an array of primitive type data elements.</p> <p> <strong>Example</strong> </p> <pre> // Java program to create, store and display values for one-dimensional // array of objects class Employee { public int id_no; public String name; Employee(int id_no, String name) { this.id_no = id_no; this.name = name; } } // The Elements of the array are objects of a class Employee. public class Array_Objects_Example { public static void main (String[] args) { // declares an Array of integers. Employee[] arr; // assigning space for 5 objects of type Employee. arr = new Employee[5]; // storing the value for the first element of the array arr[0] = new Employee(111,'Varun'); // storing the value for the second elements of the array arr[1] = new Employee(121,'Sukla'); // so on... arr[2] = new Employee(131,'Virat'); arr[3] = new Employee(141,'Anuskha'); arr[4] = new Employee(151,'Mohit'); // accessing the elements of the specified array for (int i = 0; i <arr.length; i++) system.out.println(\'element at \' + i : arr[i].id_no +\' \'+ arr[i].name); } < pre> <p> <strong>Output</strong> </p> <pre> Element at 0 : 111 Varun Element at 1 : 121 Sukla Element at 2 : 131 Virat Element at 3 : 141 Anuskha Element at 4 : 151 Mohit </pre> <h3>Multidimensional Arrays</h3> <p>Multidimensional arrays are termed 'arrays of arrays' as they can hold each element of an array with the reference of another array. These are also known as Jagged Arrays. A multidimensional array is constructed by adding a set of square brackets ([]) per dimension.</p> <p> <strong>Syntax</strong> </p> <pre> int[][] intArray = new int[10][20]; //a 2D array or matrix int[][][] intArray = new int[10][20][10]; //a 3D array </pre> <p> <strong>Example to store values in a Multidimensional Array</strong> </p> <pre> arry[0][0]=10; arry[0][1]=20; arry[0][2]=30; arry[1][0]=40; arry[1][1]=50; arry[1][3]=60; arry[2][1]=70; arry[2][2]=80; arry[2][3]=90; </pre> <p> <strong>Example of Multidimensional Array</strong> </p> <pre> class multiDimensional_Example { public static void main(String args[]) { // declaring and storing data in 2-Dimensional array int arry[][] = { {12,17,19},{32,62,12},{37,34,32} }; // traversing and printing the 2-Dimensional array for (int i=0; i<3 3 ; i++) { for (int j="0;" < j++) system.out.print(arry[i][j] + \' \'); system.out.println(); } pre> <p> <strong>Output</strong> </p> <pre> 12 17 19 32 62 12 37 34 32 </pre> <h2>4. PHP</h2> <p>PHP array is an ordered map (holds elements on the base of the key-value). It is utilized to hold multiple values of a similar data type in a single variable.</p> <p>PHP contains 3 kinds of array that are as follows:</p> <ol class="points"> <li>Indexed Array</li> <li>Associative Array</li> <li>Multidimensional Array</li> </ol> <h3>1. Indexed Array</h3> <p>PHP index is described by an integer number that begins with 0 (default value). The PHP array can store any data type, such as numbers, characters, strings, and objects. All PHP array data are allocated an index number by default.</p> <p> <strong>Syntax to store values</strong> </p> <pre> $Colour =array('Red', 'White', 'Black', 'Yellow'); </pre> <p> <strong>Or</strong> </p> <pre> $Colour[0]='Red '; $Colour[1]='White'; $Colour[2]='Black'; $Colour[3]='Yellow'; </pre> <p> <strong>Example</strong> </p> <pre> </pre> <p> <strong>Output</strong> </p> <pre> Colours are: Red, White, Black, Yellow </pre> <h3>2. Associative Array</h3> <p>In PHP, the user can associate any specific name with each array elements using the '=>' symbol.</p> <p> <strong>Syntax</strong> </p> <pre> $marks =array('Reema'=>'95','John'=>'45','Rahul'=>'20'); </pre> <p> <strong>Or</strong> </p> <pre> $marks['Reema ']='95'; $marks['John']='45'; $marks ['Rahul ']='20'; </pre> <p> <strong>Example</strong> </p> <pre> <?php $marks[\'Reema \']=\'95\'; $marks[\'John\']=\'45\'; $marks [\'Rahul \']=\'20\'; echo \'Reema\'s Marks: \'.$marks [\'Reema \'].\' <br/>'; echo ' John's Marks: '.$marks['John'].' <br>'; echo ' Rahul's Marks: '.$marks ['Rahul '].' <br>'; ?> </pre> <p> <strong>Output</strong> </p> <pre> Reema's Marks: 95 John's Marks: 45 Rahul's Marks: 20 </pre> <h3>3. Multidimensional Array</h3> <p>Multidimensional arrays in PHP are also termed as 'array of arrays'. It enabled the user to store array data in a tabular format. PHP multidimensional array can be expressed in the form of a matrix which is denoted by row * column.</p> <p> <strong>Syntax</strong> </p> <pre> $emp = array ( array (1,'Reema',95), array(2,'john',45), array(3,'rahul',20) ); </pre> <p> <strong>Example</strong> </p> <pre> <?php $emp = array ( array (1,\'Reema\',95), array(2,\'john\',45), array(3,\'rahul\',20) ); for ($row = 0; $row < 3; $row++) { for ($col = 0; $col < 3; $col++) { echo $emp[$row][$col].\' \'; } echo \' <br/>'; } ?> </pre> <p> <strong>Output</strong> </p> <pre> 1 Reema 95 2 john 45 3 rahul 20 </pre> <h2>5. Python</h2> <p>Python uses a module named 'Array' to handle all the functions of Arrays in Python. It is helpful when the user wants to manipulate only particular data values. Given below are the keywords that are important to learn the concept of an array in Python:</p> <ul> <li>Element - Any data stored in an array is known an element.</li> <li>Index - Whenever an array stores any data, it has some numerical location known as index that is beneficial to identify the location of the element.</li> </ul> <p> <strong>Syntax</strong> </p> <pre> from array import * arrayName = array(typecode, [data_to_be_initialized]) </pre> <p> <strong>Example</strong> </p> <pre> import array as arry n = arry.array('i', [20, 40, 60, 80]) print('First array value:', n[0]) print('Second array value:', n[1]) print('Second last array value:', n[-1]) </pre> <p> <strong>Output</strong> </p> <pre> First array value: 20 Second array value: 40 Second last array value: 80 </pre> <hr></3></pre></arr.length;></pre></arr.length;i++)></pre></4;></pre></4;> Flerdimensjonal matrise
C++-språket aktiverer også flerdimensjonale arrays.
Syntaks for initialisering av 2D-array
int a[4][3] = { {0, 1, 2} , /* storing data in array for row indexed by 0 */ {42, 25, 62} , /* storing data in array for row indexed by 1 */ {18, 90, 15}, /* storing data in array for row indexed by 2 */ {21, 19, 25}, /* storing data in array for row indexed by 3 */ }; Eksempel
#include using namespace std; int main () { // declaring an array with 4 rows and 2 columns. int arr[4][2] = { {1,0}, {0,2}, {2,3}, {5,6}}; // traversing the output for each array value for ( int i = 0; i <4; i++ ) for ( int j="0;" < 2; j++ { cout << \'array at position[\' i \'][\' \']: \'; arr[i][j]<< endl; } return 0; pre> <p> <strong>Output</strong> </p> <pre> array at position[0][0]: 1 array at position[0][1]: 0 array at position[1][0]: 0 array at position[1][1]: 2 array at position[2][0]: 2 array at position[2][1]: 3 array at position[3][0]: 5 array at position[3][1]: 6 </pre> <h2>3. Java</h2> <p>In Java language, Arrays work differently than what they used to do in C or C++ language.</p> <h3>One-Dimensional Arrays:</h3> <p>To declare an array, the user needs to have two primary components: the type and the array's name.</p> <p>The 'Type' refers to the elementary type of a specific array. It determines the data type of all elements that are included in the array. It comprises the array of primitive data types, unlike integers, char, float, double, etc., or it could include the user-defined data types (objects of a class) as well. Therefore, the element type for the array concludes what kind of data the array will contain.</p> <p> <strong>Syntax</strong> </p> <pre> type arr_var_name[]; OR type[] arr_var_name; OR var-name = new type [size]; </pre> <p> <strong>Store values in one-dimensional array</strong> </p> <p>Assigning values to an element in an array is similar to assigning values to scalar variables.</p> <pre> Array [index]= initializers; arr[1]= 50 arr[2]= 20 </pre> <h4>NOTE: It the array element is not assigned any value, by default it has a Null (empty) value.</h4> <p> <strong>Example</strong> </p> <pre> //Java Program to demonstrate how to initialize, store and display //values in one-dimensional arrays. class Testarray{ public static void main(String args[]){ int arr[]=new int[5];//declaration and instantiation arr[0]=20;//initialization of the array arr[1]=40; arr[2]=60; arr[3]=80; arr[4]=100; //traversing array to print the array values for(int i=0;i <arr.length;i++) system.out.println(arr[i]); }} < pre> <p> <strong>Output</strong> </p> <pre> 20 40 60 80 100 </pre> <h3>Arrays of Objects</h3> <p>An array of objects is constructed in the same way as an array of primitive type data elements.</p> <p> <strong>Example</strong> </p> <pre> // Java program to create, store and display values for one-dimensional // array of objects class Employee { public int id_no; public String name; Employee(int id_no, String name) { this.id_no = id_no; this.name = name; } } // The Elements of the array are objects of a class Employee. public class Array_Objects_Example { public static void main (String[] args) { // declares an Array of integers. Employee[] arr; // assigning space for 5 objects of type Employee. arr = new Employee[5]; // storing the value for the first element of the array arr[0] = new Employee(111,'Varun'); // storing the value for the second elements of the array arr[1] = new Employee(121,'Sukla'); // so on... arr[2] = new Employee(131,'Virat'); arr[3] = new Employee(141,'Anuskha'); arr[4] = new Employee(151,'Mohit'); // accessing the elements of the specified array for (int i = 0; i <arr.length; i++) system.out.println(\'element at \' + i : arr[i].id_no +\' \'+ arr[i].name); } < pre> <p> <strong>Output</strong> </p> <pre> Element at 0 : 111 Varun Element at 1 : 121 Sukla Element at 2 : 131 Virat Element at 3 : 141 Anuskha Element at 4 : 151 Mohit </pre> <h3>Multidimensional Arrays</h3> <p>Multidimensional arrays are termed 'arrays of arrays' as they can hold each element of an array with the reference of another array. These are also known as Jagged Arrays. A multidimensional array is constructed by adding a set of square brackets ([]) per dimension.</p> <p> <strong>Syntax</strong> </p> <pre> int[][] intArray = new int[10][20]; //a 2D array or matrix int[][][] intArray = new int[10][20][10]; //a 3D array </pre> <p> <strong>Example to store values in a Multidimensional Array</strong> </p> <pre> arry[0][0]=10; arry[0][1]=20; arry[0][2]=30; arry[1][0]=40; arry[1][1]=50; arry[1][3]=60; arry[2][1]=70; arry[2][2]=80; arry[2][3]=90; </pre> <p> <strong>Example of Multidimensional Array</strong> </p> <pre> class multiDimensional_Example { public static void main(String args[]) { // declaring and storing data in 2-Dimensional array int arry[][] = { {12,17,19},{32,62,12},{37,34,32} }; // traversing and printing the 2-Dimensional array for (int i=0; i<3 3 ; i++) { for (int j="0;" < j++) system.out.print(arry[i][j] + \' \'); system.out.println(); } pre> <p> <strong>Output</strong> </p> <pre> 12 17 19 32 62 12 37 34 32 </pre> <h2>4. PHP</h2> <p>PHP array is an ordered map (holds elements on the base of the key-value). It is utilized to hold multiple values of a similar data type in a single variable.</p> <p>PHP contains 3 kinds of array that are as follows:</p> <ol class="points"> <li>Indexed Array</li> <li>Associative Array</li> <li>Multidimensional Array</li> </ol> <h3>1. Indexed Array</h3> <p>PHP index is described by an integer number that begins with 0 (default value). The PHP array can store any data type, such as numbers, characters, strings, and objects. All PHP array data are allocated an index number by default.</p> <p> <strong>Syntax to store values</strong> </p> <pre> $Colour =array('Red', 'White', 'Black', 'Yellow'); </pre> <p> <strong>Or</strong> </p> <pre> $Colour[0]='Red '; $Colour[1]='White'; $Colour[2]='Black'; $Colour[3]='Yellow'; </pre> <p> <strong>Example</strong> </p> <pre> </pre> <p> <strong>Output</strong> </p> <pre> Colours are: Red, White, Black, Yellow </pre> <h3>2. Associative Array</h3> <p>In PHP, the user can associate any specific name with each array elements using the '=>' symbol.</p> <p> <strong>Syntax</strong> </p> <pre> $marks =array('Reema'=>'95','John'=>'45','Rahul'=>'20'); </pre> <p> <strong>Or</strong> </p> <pre> $marks['Reema ']='95'; $marks['John']='45'; $marks ['Rahul ']='20'; </pre> <p> <strong>Example</strong> </p> <pre> <?php $marks[\'Reema \']=\'95\'; $marks[\'John\']=\'45\'; $marks [\'Rahul \']=\'20\'; echo \'Reema\'s Marks: \'.$marks [\'Reema \'].\' <br/>'; echo ' John's Marks: '.$marks['John'].' <br>'; echo ' Rahul's Marks: '.$marks ['Rahul '].' <br>'; ?> </pre> <p> <strong>Output</strong> </p> <pre> Reema's Marks: 95 John's Marks: 45 Rahul's Marks: 20 </pre> <h3>3. Multidimensional Array</h3> <p>Multidimensional arrays in PHP are also termed as 'array of arrays'. It enabled the user to store array data in a tabular format. PHP multidimensional array can be expressed in the form of a matrix which is denoted by row * column.</p> <p> <strong>Syntax</strong> </p> <pre> $emp = array ( array (1,'Reema',95), array(2,'john',45), array(3,'rahul',20) ); </pre> <p> <strong>Example</strong> </p> <pre> <?php $emp = array ( array (1,\'Reema\',95), array(2,\'john\',45), array(3,\'rahul\',20) ); for ($row = 0; $row < 3; $row++) { for ($col = 0; $col < 3; $col++) { echo $emp[$row][$col].\' \'; } echo \' <br/>'; } ?> </pre> <p> <strong>Output</strong> </p> <pre> 1 Reema 95 2 john 45 3 rahul 20 </pre> <h2>5. Python</h2> <p>Python uses a module named 'Array' to handle all the functions of Arrays in Python. It is helpful when the user wants to manipulate only particular data values. Given below are the keywords that are important to learn the concept of an array in Python:</p> <ul> <li>Element - Any data stored in an array is known an element.</li> <li>Index - Whenever an array stores any data, it has some numerical location known as index that is beneficial to identify the location of the element.</li> </ul> <p> <strong>Syntax</strong> </p> <pre> from array import * arrayName = array(typecode, [data_to_be_initialized]) </pre> <p> <strong>Example</strong> </p> <pre> import array as arry n = arry.array('i', [20, 40, 60, 80]) print('First array value:', n[0]) print('Second array value:', n[1]) print('Second last array value:', n[-1]) </pre> <p> <strong>Output</strong> </p> <pre> First array value: 20 Second array value: 40 Second last array value: 80 </pre> <hr></3></pre></arr.length;></pre></arr.length;i++)></pre></4;> 3. Java
I Java-språk fungerer Arrays annerledes enn det de pleide å gjøre i C- eller C++-språk.
Endimensjonale matriser:
For å deklarere en matrise, må brukeren ha to primære komponenter: typen og matrisens navn.
'Type' refererer til den elementære typen til en spesifikk matrise. Den bestemmer datatypen for alle elementene som er inkludert i matrisen. Den omfatter en rekke primitive datatyper, i motsetning til heltall, char, float, double, etc., eller den kan også inkludere brukerdefinerte datatyper (objekter i en klasse). Derfor konkluderer elementtypen for matrisen hva slags data matrisen vil inneholde.
Syntaks
type arr_var_name[]; OR type[] arr_var_name; OR var-name = new type [size];
Lagre verdier i endimensjonal matrise
Å tilordne verdier til et element i en matrise ligner på å tilordne verdier til skalarvariabler.
Array [index]= initializers; arr[1]= 50 arr[2]= 20
MERK: Hvis matriseelementet ikke er tildelt noen verdi, har det som standard en Null (tom) verdi.
Eksempel
//Java Program to demonstrate how to initialize, store and display //values in one-dimensional arrays. class Testarray{ public static void main(String args[]){ int arr[]=new int[5];//declaration and instantiation arr[0]=20;//initialization of the array arr[1]=40; arr[2]=60; arr[3]=80; arr[4]=100; //traversing array to print the array values for(int i=0;i <arr.length;i++) system.out.println(arr[i]); }} < pre> <p> <strong>Output</strong> </p> <pre> 20 40 60 80 100 </pre> <h3>Arrays of Objects</h3> <p>An array of objects is constructed in the same way as an array of primitive type data elements.</p> <p> <strong>Example</strong> </p> <pre> // Java program to create, store and display values for one-dimensional // array of objects class Employee { public int id_no; public String name; Employee(int id_no, String name) { this.id_no = id_no; this.name = name; } } // The Elements of the array are objects of a class Employee. public class Array_Objects_Example { public static void main (String[] args) { // declares an Array of integers. Employee[] arr; // assigning space for 5 objects of type Employee. arr = new Employee[5]; // storing the value for the first element of the array arr[0] = new Employee(111,'Varun'); // storing the value for the second elements of the array arr[1] = new Employee(121,'Sukla'); // so on... arr[2] = new Employee(131,'Virat'); arr[3] = new Employee(141,'Anuskha'); arr[4] = new Employee(151,'Mohit'); // accessing the elements of the specified array for (int i = 0; i <arr.length; i++) system.out.println(\'element at \' + i : arr[i].id_no +\' \'+ arr[i].name); } < pre> <p> <strong>Output</strong> </p> <pre> Element at 0 : 111 Varun Element at 1 : 121 Sukla Element at 2 : 131 Virat Element at 3 : 141 Anuskha Element at 4 : 151 Mohit </pre> <h3>Multidimensional Arrays</h3> <p>Multidimensional arrays are termed 'arrays of arrays' as they can hold each element of an array with the reference of another array. These are also known as Jagged Arrays. A multidimensional array is constructed by adding a set of square brackets ([]) per dimension.</p> <p> <strong>Syntax</strong> </p> <pre> int[][] intArray = new int[10][20]; //a 2D array or matrix int[][][] intArray = new int[10][20][10]; //a 3D array </pre> <p> <strong>Example to store values in a Multidimensional Array</strong> </p> <pre> arry[0][0]=10; arry[0][1]=20; arry[0][2]=30; arry[1][0]=40; arry[1][1]=50; arry[1][3]=60; arry[2][1]=70; arry[2][2]=80; arry[2][3]=90; </pre> <p> <strong>Example of Multidimensional Array</strong> </p> <pre> class multiDimensional_Example { public static void main(String args[]) { // declaring and storing data in 2-Dimensional array int arry[][] = { {12,17,19},{32,62,12},{37,34,32} }; // traversing and printing the 2-Dimensional array for (int i=0; i<3 3 ; i++) { for (int j="0;" < j++) system.out.print(arry[i][j] + \' \'); system.out.println(); } pre> <p> <strong>Output</strong> </p> <pre> 12 17 19 32 62 12 37 34 32 </pre> <h2>4. PHP</h2> <p>PHP array is an ordered map (holds elements on the base of the key-value). It is utilized to hold multiple values of a similar data type in a single variable.</p> <p>PHP contains 3 kinds of array that are as follows:</p> <ol class="points"> <li>Indexed Array</li> <li>Associative Array</li> <li>Multidimensional Array</li> </ol> <h3>1. Indexed Array</h3> <p>PHP index is described by an integer number that begins with 0 (default value). The PHP array can store any data type, such as numbers, characters, strings, and objects. All PHP array data are allocated an index number by default.</p> <p> <strong>Syntax to store values</strong> </p> <pre> $Colour =array('Red', 'White', 'Black', 'Yellow'); </pre> <p> <strong>Or</strong> </p> <pre> $Colour[0]='Red '; $Colour[1]='White'; $Colour[2]='Black'; $Colour[3]='Yellow'; </pre> <p> <strong>Example</strong> </p> <pre> </pre> <p> <strong>Output</strong> </p> <pre> Colours are: Red, White, Black, Yellow </pre> <h3>2. Associative Array</h3> <p>In PHP, the user can associate any specific name with each array elements using the '=>' symbol.</p> <p> <strong>Syntax</strong> </p> <pre> $marks =array('Reema'=>'95','John'=>'45','Rahul'=>'20'); </pre> <p> <strong>Or</strong> </p> <pre> $marks['Reema ']='95'; $marks['John']='45'; $marks ['Rahul ']='20'; </pre> <p> <strong>Example</strong> </p> <pre> <?php $marks[\'Reema \']=\'95\'; $marks[\'John\']=\'45\'; $marks [\'Rahul \']=\'20\'; echo \'Reema\'s Marks: \'.$marks [\'Reema \'].\' <br/>'; echo ' John's Marks: '.$marks['John'].' <br>'; echo ' Rahul's Marks: '.$marks ['Rahul '].' <br>'; ?> </pre> <p> <strong>Output</strong> </p> <pre> Reema's Marks: 95 John's Marks: 45 Rahul's Marks: 20 </pre> <h3>3. Multidimensional Array</h3> <p>Multidimensional arrays in PHP are also termed as 'array of arrays'. It enabled the user to store array data in a tabular format. PHP multidimensional array can be expressed in the form of a matrix which is denoted by row * column.</p> <p> <strong>Syntax</strong> </p> <pre> $emp = array ( array (1,'Reema',95), array(2,'john',45), array(3,'rahul',20) ); </pre> <p> <strong>Example</strong> </p> <pre> <?php $emp = array ( array (1,\'Reema\',95), array(2,\'john\',45), array(3,\'rahul\',20) ); for ($row = 0; $row < 3; $row++) { for ($col = 0; $col < 3; $col++) { echo $emp[$row][$col].\' \'; } echo \' <br/>'; } ?> </pre> <p> <strong>Output</strong> </p> <pre> 1 Reema 95 2 john 45 3 rahul 20 </pre> <h2>5. Python</h2> <p>Python uses a module named 'Array' to handle all the functions of Arrays in Python. It is helpful when the user wants to manipulate only particular data values. Given below are the keywords that are important to learn the concept of an array in Python:</p> <ul> <li>Element - Any data stored in an array is known an element.</li> <li>Index - Whenever an array stores any data, it has some numerical location known as index that is beneficial to identify the location of the element.</li> </ul> <p> <strong>Syntax</strong> </p> <pre> from array import * arrayName = array(typecode, [data_to_be_initialized]) </pre> <p> <strong>Example</strong> </p> <pre> import array as arry n = arry.array('i', [20, 40, 60, 80]) print('First array value:', n[0]) print('Second array value:', n[1]) print('Second last array value:', n[-1]) </pre> <p> <strong>Output</strong> </p> <pre> First array value: 20 Second array value: 40 Second last array value: 80 </pre> <hr></3></pre></arr.length;></pre></arr.length;i++)> Matriser av objekter
En rekke objekter er konstruert på samme måte som en rekke primitive dataelementer.
lister i java
Eksempel
// Java program to create, store and display values for one-dimensional // array of objects class Employee { public int id_no; public String name; Employee(int id_no, String name) { this.id_no = id_no; this.name = name; } } // The Elements of the array are objects of a class Employee. public class Array_Objects_Example { public static void main (String[] args) { // declares an Array of integers. Employee[] arr; // assigning space for 5 objects of type Employee. arr = new Employee[5]; // storing the value for the first element of the array arr[0] = new Employee(111,'Varun'); // storing the value for the second elements of the array arr[1] = new Employee(121,'Sukla'); // so on... arr[2] = new Employee(131,'Virat'); arr[3] = new Employee(141,'Anuskha'); arr[4] = new Employee(151,'Mohit'); // accessing the elements of the specified array for (int i = 0; i <arr.length; i++) system.out.println(\\'element at \\' + i : arr[i].id_no +\\' \\'+ arr[i].name); } < pre> <p> <strong>Output</strong> </p> <pre> Element at 0 : 111 Varun Element at 1 : 121 Sukla Element at 2 : 131 Virat Element at 3 : 141 Anuskha Element at 4 : 151 Mohit </pre> <h3>Multidimensional Arrays</h3> <p>Multidimensional arrays are termed 'arrays of arrays' as they can hold each element of an array with the reference of another array. These are also known as Jagged Arrays. A multidimensional array is constructed by adding a set of square brackets ([]) per dimension.</p> <p> <strong>Syntax</strong> </p> <pre> int[][] intArray = new int[10][20]; //a 2D array or matrix int[][][] intArray = new int[10][20][10]; //a 3D array </pre> <p> <strong>Example to store values in a Multidimensional Array</strong> </p> <pre> arry[0][0]=10; arry[0][1]=20; arry[0][2]=30; arry[1][0]=40; arry[1][1]=50; arry[1][3]=60; arry[2][1]=70; arry[2][2]=80; arry[2][3]=90; </pre> <p> <strong>Example of Multidimensional Array</strong> </p> <pre> class multiDimensional_Example { public static void main(String args[]) { // declaring and storing data in 2-Dimensional array int arry[][] = { {12,17,19},{32,62,12},{37,34,32} }; // traversing and printing the 2-Dimensional array for (int i=0; i<3 3 ; i++) { for (int j="0;" < j++) system.out.print(arry[i][j] + \\' \\'); system.out.println(); } pre> <p> <strong>Output</strong> </p> <pre> 12 17 19 32 62 12 37 34 32 </pre> <h2>4. PHP</h2> <p>PHP array is an ordered map (holds elements on the base of the key-value). It is utilized to hold multiple values of a similar data type in a single variable.</p> <p>PHP contains 3 kinds of array that are as follows:</p> <ol class="points"> <li>Indexed Array</li> <li>Associative Array</li> <li>Multidimensional Array</li> </ol> <h3>1. Indexed Array</h3> <p>PHP index is described by an integer number that begins with 0 (default value). The PHP array can store any data type, such as numbers, characters, strings, and objects. All PHP array data are allocated an index number by default.</p> <p> <strong>Syntax to store values</strong> </p> <pre> $Colour =array('Red', 'White', 'Black', 'Yellow'); </pre> <p> <strong>Or</strong> </p> <pre> $Colour[0]='Red '; $Colour[1]='White'; $Colour[2]='Black'; $Colour[3]='Yellow'; </pre> <p> <strong>Example</strong> </p> <pre> </pre> <p> <strong>Output</strong> </p> <pre> Colours are: Red, White, Black, Yellow </pre> <h3>2. Associative Array</h3> <p>In PHP, the user can associate any specific name with each array elements using the '=>' symbol.</p> <p> <strong>Syntax</strong> </p> <pre> $marks =array('Reema'=>'95','John'=>'45','Rahul'=>'20'); </pre> <p> <strong>Or</strong> </p> <pre> $marks['Reema ']='95'; $marks['John']='45'; $marks ['Rahul ']='20'; </pre> <p> <strong>Example</strong> </p> <pre> <?php $marks[\\'Reema \\']=\\'95\\'; $marks[\\'John\\']=\\'45\\'; $marks [\\'Rahul \\']=\\'20\\'; echo \\'Reema\\'s Marks: \\'.$marks [\\'Reema \\'].\\' <br/>'; echo ' John's Marks: '.$marks['John'].' <br>'; echo ' Rahul's Marks: '.$marks ['Rahul '].' <br>'; ?> </pre> <p> <strong>Output</strong> </p> <pre> Reema's Marks: 95 John's Marks: 45 Rahul's Marks: 20 </pre> <h3>3. Multidimensional Array</h3> <p>Multidimensional arrays in PHP are also termed as 'array of arrays'. It enabled the user to store array data in a tabular format. PHP multidimensional array can be expressed in the form of a matrix which is denoted by row * column.</p> <p> <strong>Syntax</strong> </p> <pre> $emp = array ( array (1,'Reema',95), array(2,'john',45), array(3,'rahul',20) ); </pre> <p> <strong>Example</strong> </p> <pre> <?php $emp = array ( array (1,\\'Reema\\',95), array(2,\\'john\\',45), array(3,\\'rahul\\',20) ); for ($row = 0; $row < 3; $row++) { for ($col = 0; $col < 3; $col++) { echo $emp[$row][$col].\\' \\'; } echo \\' <br/>'; } ?> </pre> <p> <strong>Output</strong> </p> <pre> 1 Reema 95 2 john 45 3 rahul 20 </pre> <h2>5. Python</h2> <p>Python uses a module named 'Array' to handle all the functions of Arrays in Python. It is helpful when the user wants to manipulate only particular data values. Given below are the keywords that are important to learn the concept of an array in Python:</p> <ul> <li>Element - Any data stored in an array is known an element.</li> <li>Index - Whenever an array stores any data, it has some numerical location known as index that is beneficial to identify the location of the element.</li> </ul> <p> <strong>Syntax</strong> </p> <pre> from array import * arrayName = array(typecode, [data_to_be_initialized]) </pre> <p> <strong>Example</strong> </p> <pre> import array as arry n = arry.array('i', [20, 40, 60, 80]) print('First array value:', n[0]) print('Second array value:', n[1]) print('Second last array value:', n[-1]) </pre> <p> <strong>Output</strong> </p> <pre> First array value: 20 Second array value: 40 Second last array value: 80 </pre> <hr></3></pre></arr.length;> Flerdimensjonale matriser
Flerdimensjonale arrayer kalles 'arrays of arrays' da de kan inneholde hvert element i en matrise med referansen til en annen matrise. Disse er også kjent som Jagged Arrays. En flerdimensjonal matrise er konstruert ved å legge til et sett med firkantede parenteser ([]) per dimensjon.
Syntaks
int[][] intArray = new int[10][20]; //a 2D array or matrix int[][][] intArray = new int[10][20][10]; //a 3D array
Eksempel for å lagre verdier i en flerdimensjonal matrise
arry[0][0]=10; arry[0][1]=20; arry[0][2]=30; arry[1][0]=40; arry[1][1]=50; arry[1][3]=60; arry[2][1]=70; arry[2][2]=80; arry[2][3]=90;
Eksempel på flerdimensjonal array
class multiDimensional_Example { public static void main(String args[]) { // declaring and storing data in 2-Dimensional array int arry[][] = { {12,17,19},{32,62,12},{37,34,32} }; // traversing and printing the 2-Dimensional array for (int i=0; i<3 3 ; i++) { for (int j="0;" < j++) system.out.print(arry[i][j] + \\' \\'); system.out.println(); } pre> <p> <strong>Output</strong> </p> <pre> 12 17 19 32 62 12 37 34 32 </pre> <h2>4. PHP</h2> <p>PHP array is an ordered map (holds elements on the base of the key-value). It is utilized to hold multiple values of a similar data type in a single variable.</p> <p>PHP contains 3 kinds of array that are as follows:</p> <ol class="points"> <li>Indexed Array</li> <li>Associative Array</li> <li>Multidimensional Array</li> </ol> <h3>1. Indexed Array</h3> <p>PHP index is described by an integer number that begins with 0 (default value). The PHP array can store any data type, such as numbers, characters, strings, and objects. All PHP array data are allocated an index number by default.</p> <p> <strong>Syntax to store values</strong> </p> <pre> $Colour =array('Red', 'White', 'Black', 'Yellow'); </pre> <p> <strong>Or</strong> </p> <pre> $Colour[0]='Red '; $Colour[1]='White'; $Colour[2]='Black'; $Colour[3]='Yellow'; </pre> <p> <strong>Example</strong> </p> <pre> </pre> <p> <strong>Output</strong> </p> <pre> Colours are: Red, White, Black, Yellow </pre> <h3>2. Associative Array</h3> <p>In PHP, the user can associate any specific name with each array elements using the '=>' symbol.</p> <p> <strong>Syntax</strong> </p> <pre> $marks =array('Reema'=>'95','John'=>'45','Rahul'=>'20'); </pre> <p> <strong>Or</strong> </p> <pre> $marks['Reema ']='95'; $marks['John']='45'; $marks ['Rahul ']='20'; </pre> <p> <strong>Example</strong> </p> <pre> <?php $marks[\\'Reema \\']=\\'95\\'; $marks[\\'John\\']=\\'45\\'; $marks [\\'Rahul \\']=\\'20\\'; echo \\'Reema\\'s Marks: \\'.$marks [\\'Reema \\'].\\' <br/>'; echo ' John's Marks: '.$marks['John'].' <br>'; echo ' Rahul's Marks: '.$marks ['Rahul '].' <br>'; ?> </pre> <p> <strong>Output</strong> </p> <pre> Reema's Marks: 95 John's Marks: 45 Rahul's Marks: 20 </pre> <h3>3. Multidimensional Array</h3> <p>Multidimensional arrays in PHP are also termed as 'array of arrays'. It enabled the user to store array data in a tabular format. PHP multidimensional array can be expressed in the form of a matrix which is denoted by row * column.</p> <p> <strong>Syntax</strong> </p> <pre> $emp = array ( array (1,'Reema',95), array(2,'john',45), array(3,'rahul',20) ); </pre> <p> <strong>Example</strong> </p> <pre> <?php $emp = array ( array (1,\\'Reema\\',95), array(2,\\'john\\',45), array(3,\\'rahul\\',20) ); for ($row = 0; $row < 3; $row++) { for ($col = 0; $col < 3; $col++) { echo $emp[$row][$col].\\' \\'; } echo \\' <br/>'; } ?> </pre> <p> <strong>Output</strong> </p> <pre> 1 Reema 95 2 john 45 3 rahul 20 </pre> <h2>5. Python</h2> <p>Python uses a module named 'Array' to handle all the functions of Arrays in Python. It is helpful when the user wants to manipulate only particular data values. Given below are the keywords that are important to learn the concept of an array in Python:</p> <ul> <li>Element - Any data stored in an array is known an element.</li> <li>Index - Whenever an array stores any data, it has some numerical location known as index that is beneficial to identify the location of the element.</li> </ul> <p> <strong>Syntax</strong> </p> <pre> from array import * arrayName = array(typecode, [data_to_be_initialized]) </pre> <p> <strong>Example</strong> </p> <pre> import array as arry n = arry.array('i', [20, 40, 60, 80]) print('First array value:', n[0]) print('Second array value:', n[1]) print('Second last array value:', n[-1]) </pre> <p> <strong>Output</strong> </p> <pre> First array value: 20 Second array value: 40 Second last array value: 80 </pre> <hr></3> 4. PHP
PHP-array er et ordnet kart (inneholder elementer på bunnen av nøkkelverdien). Den brukes til å holde flere verdier av en lignende datatype i en enkelt variabel.
java-program
PHP inneholder 3 typer array som er som følger:
- Indeksert matrise
- Assosiativ matrise
- Flerdimensjonal matrise
1. Indeksert matrise
PHP-indeksen er beskrevet av et heltall som begynner med 0 (standardverdi). PHP-arrayen kan lagre alle datatyper, for eksempel tall, tegn, strenger og objekter. Alle PHP-arraydata tildeles et indeksnummer som standard.
Syntaks for å lagre verdier
$Colour =array('Red', 'White', 'Black', 'Yellow');
Eller
$Colour[0]='Red '; $Colour[1]='White'; $Colour[2]='Black'; $Colour[3]='Yellow';
Eksempel
Produksjon
Colours are: Red, White, Black, Yellow
2. Associative Array
I PHP kan brukeren knytte et hvilket som helst spesifikt navn til hvert array-element ved å bruke '=>'-symbolet.
Syntaks
$marks =array('Reema'=>'95','John'=>'45','Rahul'=>'20');
Eller
$marks['Reema ']='95'; $marks['John']='45'; $marks ['Rahul ']='20';
Eksempel
<?php $marks[\\'Reema \\']=\\'95\\'; $marks[\\'John\\']=\\'45\\'; $marks [\\'Rahul \\']=\\'20\\'; echo \\'Reema\\'s Marks: \\'.$marks [\\'Reema \\'].\\' <br/>'; echo ' John's Marks: '.$marks['John'].' <br>'; echo ' Rahul's Marks: '.$marks ['Rahul '].' <br>'; ?>
Produksjon
Reema's Marks: 95 John's Marks: 45 Rahul's Marks: 20
3. Flerdimensjonal matrise
Flerdimensjonale arrays i PHP kalles også 'array of arrays'. Det gjorde det mulig for brukeren å lagre matrisedata i et tabellformat. PHP flerdimensjonal array kan uttrykkes i form av en matrise som er angitt med rad * kolonne.
Syntaks
c program for strengsammenligning
$emp = array ( array (1,'Reema',95), array(2,'john',45), array(3,'rahul',20) );
Eksempel
<?php $emp = array ( array (1,\\'Reema\\',95), array(2,\\'john\\',45), array(3,\\'rahul\\',20) ); for ($row = 0; $row < 3; $row++) { for ($col = 0; $col < 3; $col++) { echo $emp[$row][$col].\\' \\'; } echo \\' <br/>'; } ?> Produksjon
1 Reema 95 2 john 45 3 rahul 20
5. Python
Python bruker en modul kalt 'Array' for å håndtere alle funksjonene til Arrays i Python. Det er nyttig når brukeren ønsker å manipulere bare bestemte dataverdier. Nedenfor er nøkkelordene som er viktige for å lære konseptet med en matrise i Python:
- Element - Alle data som er lagret i en matrise er kjent som et element.
- Indeks - Når en matrise lagrer data, har den en numerisk plassering kjent som indeks som er fordelaktig for å identifisere plasseringen til elementet.
Syntaks
from array import * arrayName = array(typecode, [data_to_be_initialized])
Eksempel
import array as arry n = arry.array('i', [20, 40, 60, 80]) print('First array value:', n[0]) print('Second array value:', n[1]) print('Second last array value:', n[-1])
Produksjon
First array value: 20 Second array value: 40 Second last array value: 80