De for loop i C-språk brukes til å iterere utsagnene eller en del av programmet flere ganger. Det brukes ofte til å krysse datastrukturene som matrisen og den koblede listen.
Syntaks for for loop i C
Syntaksen til for loop i c-språk er gitt nedenfor:
erklæringsdekning
for(Expression 1; Expression 2; Expression 3){ //code to be executed } Flytskjema for for loop i C
C for løkkeeksempler
La oss se det enkle programmet for for loop som skriver ut tabell med 1.
#include int main(){ int i=0; for(i=1;i<=10;i++){ printf('%d
',i); } return 0; < pre> <p> <strong>Output</strong> </p> <pre> 1 2 3 4 5 6 7 8 9 10 </pre> <h3>C Program: Print table for the given number using C for loop</h3> <pre> #include int main(){ int i=1,number=0; printf('Enter a number: '); scanf('%d',&number); for(i=1;i<=10;i++){ printf('%d
',(number*i)); } return 0; < pre> <p> <strong>Output</strong> </p> <pre> Enter a number: 2 2 4 6 8 10 12 14 16 18 20 </pre> <pre> Enter a number: 1000 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 </pre> <h3>Properties of Expression 1</h3> <ul> <li>The expression represents the initialization of the loop variable.</li> <li>We can initialize more than one variable in Expression 1.</li> <li>Expression 1 is optional.</li> <li>In C, we can not declare the variables in Expression 1. However, It can be an exception in some compilers.</li> </ul> <p> <strong>Example 1</strong> </p> <pre> #include int main() { int a,b,c; for(a=0,b=12,c=23;a<2;a++) { printf('%d ',a+b+c); } < pre> <p> <strong>Output</strong> </p> <pre> 35 36 </pre> <p> <strong>Example 2</strong> </p> <pre> #include int main() { int i=1; for(;i<5;i++) { printf('%d ',i); } < pre> <p> <strong>Output</strong> </p> <pre> 1 2 3 4 </pre> <h3>Properties of Expression 2</h3> <ul> <li>Expression 2 is a conditional expression. It checks for a specific condition to be satisfied. If it is not, the loop is terminated.</li> <li>Expression 2 can have more than one condition. However, the loop will iterate until the last condition becomes false. Other conditions will be treated as statements.</li> <li>Expression 2 is optional.</li> <li>Expression 2 can perform the task of expression 1 and expression 3. That is, we can initialize the variable as well as update the loop variable in expression 2 itself.</li> <li>We can pass zero or non-zero value in expression 2. However, in C, any non-zero value is true, and zero is false by default.</li> </ul> <p> <strong>Example 1</strong> </p> <pre> #include int main() { int i; for(i=0;i<=4;i++) { printf('%d ',i); } < pre> <p> <strong>output</strong> </p> <pre> 0 1 2 3 4 </pre> <p> <strong>Example 2</strong> </p> <pre> #include int main() { int i,j,k; for(i=0,j=0,k=0;i<4,k<8,j<10;i++) { printf('%d %d %d
',i,j,k); j+="2;" k+="3;" } < pre> <p> <strong>Output</strong> </p> <pre> 0 0 0 1 2 3 2 4 6 3 6 9 4 8 12 </pre> <p> <strong>Example 3</strong> </p> <pre> #include int main() { int i; for(i=0;;i++) { printf('%d',i); } } </pre> <p> <strong>Output</strong> </p> <pre> infinite loop </pre> <h4>Properties of Expression 3 <ul> <li>Expression 3 is used to update the loop variable.</li> <li>We can update more than one variable at the same time.</li> <li>Expression 3 is optional.</li> </ul> <p> <strong>Example 1</strong> </p> <pre> #include void main () { int i=0,j=2; for(i = 0;i<5;i++,j=j+2) { printf('%d %d
',i,j); } < pre> <p> <strong>Output</strong> <pre> 0 2 1 4 2 6 3 8 4 10 </pre> </p><h3>Loop body</h3> <p>The braces {} are used to define the scope of the loop. However, if the loop contains only one statement, then we don't need to use braces. A loop without a body is possible. The braces work as a block separator, i.e., the value variable declared inside for loop is valid only for that block and not outside. Consider the following example.</p> <pre> #include void main () { int i; for(i=0;i<10;i++) { int i="20;" printf('%d ',i); } < pre> <p> <strong>Output</strong> </p> <pre> 20 20 20 20 20 20 20 20 20 20 </pre> <h3>Infinitive for loop in C</h3> <p>To make a for loop infinite, we need not give any expression in the syntax. Instead of that, we need to provide two semicolons to validate the syntax of the for loop. This will work as an infinite for loop.</p> <pre> #include void main () { for(;;) { printf('welcome to javatpoint'); } } </pre> <p>If you run this program, you will see above statement infinite times.</p> <hr></10;i++)></pre></5;i++,j=j+2)></pre></h4></4,k<8,j<10;i++)></pre></=4;i++)></pre></5;i++)></pre></2;a++)></pre></=10;i++){></pre></=10;i++){> C Program: Skriv ut tabell for det gitte tallet med C for loop
#include int main(){ int i=1,number=0; printf('Enter a number: '); scanf('%d',&number); for(i=1;i<=10;i++){ printf(\'%d
\',(number*i)); } return 0; < pre> <p> <strong>Output</strong> </p> <pre> Enter a number: 2 2 4 6 8 10 12 14 16 18 20 </pre> <pre> Enter a number: 1000 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 </pre> <h3>Properties of Expression 1</h3> <ul> <li>The expression represents the initialization of the loop variable.</li> <li>We can initialize more than one variable in Expression 1.</li> <li>Expression 1 is optional.</li> <li>In C, we can not declare the variables in Expression 1. However, It can be an exception in some compilers.</li> </ul> <p> <strong>Example 1</strong> </p> <pre> #include int main() { int a,b,c; for(a=0,b=12,c=23;a<2;a++) { printf(\'%d \',a+b+c); } < pre> <p> <strong>Output</strong> </p> <pre> 35 36 </pre> <p> <strong>Example 2</strong> </p> <pre> #include int main() { int i=1; for(;i<5;i++) { printf(\'%d \',i); } < pre> <p> <strong>Output</strong> </p> <pre> 1 2 3 4 </pre> <h3>Properties of Expression 2</h3> <ul> <li>Expression 2 is a conditional expression. It checks for a specific condition to be satisfied. If it is not, the loop is terminated.</li> <li>Expression 2 can have more than one condition. However, the loop will iterate until the last condition becomes false. Other conditions will be treated as statements.</li> <li>Expression 2 is optional.</li> <li>Expression 2 can perform the task of expression 1 and expression 3. That is, we can initialize the variable as well as update the loop variable in expression 2 itself.</li> <li>We can pass zero or non-zero value in expression 2. However, in C, any non-zero value is true, and zero is false by default.</li> </ul> <p> <strong>Example 1</strong> </p> <pre> #include int main() { int i; for(i=0;i<=4;i++) { printf(\'%d \',i); } < pre> <p> <strong>output</strong> </p> <pre> 0 1 2 3 4 </pre> <p> <strong>Example 2</strong> </p> <pre> #include int main() { int i,j,k; for(i=0,j=0,k=0;i<4,k<8,j<10;i++) { printf(\'%d %d %d
\',i,j,k); j+="2;" k+="3;" } < pre> <p> <strong>Output</strong> </p> <pre> 0 0 0 1 2 3 2 4 6 3 6 9 4 8 12 </pre> <p> <strong>Example 3</strong> </p> <pre> #include int main() { int i; for(i=0;;i++) { printf('%d',i); } } </pre> <p> <strong>Output</strong> </p> <pre> infinite loop </pre> <h4>Properties of Expression 3 <ul> <li>Expression 3 is used to update the loop variable.</li> <li>We can update more than one variable at the same time.</li> <li>Expression 3 is optional.</li> </ul> <p> <strong>Example 1</strong> </p> <pre> #include void main () { int i=0,j=2; for(i = 0;i<5;i++,j=j+2) { printf(\'%d %d
\',i,j); } < pre> <p> <strong>Output</strong> <pre> 0 2 1 4 2 6 3 8 4 10 </pre> </p><h3>Loop body</h3> <p>The braces {} are used to define the scope of the loop. However, if the loop contains only one statement, then we don't need to use braces. A loop without a body is possible. The braces work as a block separator, i.e., the value variable declared inside for loop is valid only for that block and not outside. Consider the following example.</p> <pre> #include void main () { int i; for(i=0;i<10;i++) { int i="20;" printf(\'%d \',i); } < pre> <p> <strong>Output</strong> </p> <pre> 20 20 20 20 20 20 20 20 20 20 </pre> <h3>Infinitive for loop in C</h3> <p>To make a for loop infinite, we need not give any expression in the syntax. Instead of that, we need to provide two semicolons to validate the syntax of the for loop. This will work as an infinite for loop.</p> <pre> #include void main () { for(;;) { printf('welcome to javatpoint'); } } </pre> <p>If you run this program, you will see above statement infinite times.</p> <hr></10;i++)></pre></5;i++,j=j+2)></pre></h4></4,k<8,j<10;i++)></pre></=4;i++)></pre></5;i++)></pre></2;a++)></pre></=10;i++){> Enter a number: 1000 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Egenskaper for uttrykk 1
- Uttrykket representerer initialiseringen av løkkevariabelen.
- Vi kan initialisere mer enn én variabel i uttrykk 1.
- Uttrykk 1 er valgfritt.
- I C kan vi ikke deklarere variablene i uttrykk 1. Imidlertid kan det være et unntak i noen kompilatorer.
Eksempel 1
#include int main() { int a,b,c; for(a=0,b=12,c=23;a<2;a++) { printf(\'%d \',a+b+c); } < pre> <p> <strong>Output</strong> </p> <pre> 35 36 </pre> <p> <strong>Example 2</strong> </p> <pre> #include int main() { int i=1; for(;i<5;i++) { printf(\'%d \',i); } < pre> <p> <strong>Output</strong> </p> <pre> 1 2 3 4 </pre> <h3>Properties of Expression 2</h3> <ul> <li>Expression 2 is a conditional expression. It checks for a specific condition to be satisfied. If it is not, the loop is terminated.</li> <li>Expression 2 can have more than one condition. However, the loop will iterate until the last condition becomes false. Other conditions will be treated as statements.</li> <li>Expression 2 is optional.</li> <li>Expression 2 can perform the task of expression 1 and expression 3. That is, we can initialize the variable as well as update the loop variable in expression 2 itself.</li> <li>We can pass zero or non-zero value in expression 2. However, in C, any non-zero value is true, and zero is false by default.</li> </ul> <p> <strong>Example 1</strong> </p> <pre> #include int main() { int i; for(i=0;i<=4;i++) { printf(\'%d \',i); } < pre> <p> <strong>output</strong> </p> <pre> 0 1 2 3 4 </pre> <p> <strong>Example 2</strong> </p> <pre> #include int main() { int i,j,k; for(i=0,j=0,k=0;i<4,k<8,j<10;i++) { printf(\'%d %d %d
\',i,j,k); j+="2;" k+="3;" } < pre> <p> <strong>Output</strong> </p> <pre> 0 0 0 1 2 3 2 4 6 3 6 9 4 8 12 </pre> <p> <strong>Example 3</strong> </p> <pre> #include int main() { int i; for(i=0;;i++) { printf('%d',i); } } </pre> <p> <strong>Output</strong> </p> <pre> infinite loop </pre> <h4>Properties of Expression 3 <ul> <li>Expression 3 is used to update the loop variable.</li> <li>We can update more than one variable at the same time.</li> <li>Expression 3 is optional.</li> </ul> <p> <strong>Example 1</strong> </p> <pre> #include void main () { int i=0,j=2; for(i = 0;i<5;i++,j=j+2) { printf(\'%d %d
\',i,j); } < pre> <p> <strong>Output</strong> <pre> 0 2 1 4 2 6 3 8 4 10 </pre> </p><h3>Loop body</h3> <p>The braces {} are used to define the scope of the loop. However, if the loop contains only one statement, then we don't need to use braces. A loop without a body is possible. The braces work as a block separator, i.e., the value variable declared inside for loop is valid only for that block and not outside. Consider the following example.</p> <pre> #include void main () { int i; for(i=0;i<10;i++) { int i="20;" printf(\'%d \',i); } < pre> <p> <strong>Output</strong> </p> <pre> 20 20 20 20 20 20 20 20 20 20 </pre> <h3>Infinitive for loop in C</h3> <p>To make a for loop infinite, we need not give any expression in the syntax. Instead of that, we need to provide two semicolons to validate the syntax of the for loop. This will work as an infinite for loop.</p> <pre> #include void main () { for(;;) { printf('welcome to javatpoint'); } } </pre> <p>If you run this program, you will see above statement infinite times.</p> <hr></10;i++)></pre></5;i++,j=j+2)></pre></h4></4,k<8,j<10;i++)></pre></=4;i++)></pre></5;i++)></pre></2;a++)> Eksempel 2
#include int main() { int i=1; for(;i<5;i++) { printf(\'%d \',i); } < pre> <p> <strong>Output</strong> </p> <pre> 1 2 3 4 </pre> <h3>Properties of Expression 2</h3> <ul> <li>Expression 2 is a conditional expression. It checks for a specific condition to be satisfied. If it is not, the loop is terminated.</li> <li>Expression 2 can have more than one condition. However, the loop will iterate until the last condition becomes false. Other conditions will be treated as statements.</li> <li>Expression 2 is optional.</li> <li>Expression 2 can perform the task of expression 1 and expression 3. That is, we can initialize the variable as well as update the loop variable in expression 2 itself.</li> <li>We can pass zero or non-zero value in expression 2. However, in C, any non-zero value is true, and zero is false by default.</li> </ul> <p> <strong>Example 1</strong> </p> <pre> #include int main() { int i; for(i=0;i<=4;i++) { printf(\'%d \',i); } < pre> <p> <strong>output</strong> </p> <pre> 0 1 2 3 4 </pre> <p> <strong>Example 2</strong> </p> <pre> #include int main() { int i,j,k; for(i=0,j=0,k=0;i<4,k<8,j<10;i++) { printf(\'%d %d %d
\',i,j,k); j+="2;" k+="3;" } < pre> <p> <strong>Output</strong> </p> <pre> 0 0 0 1 2 3 2 4 6 3 6 9 4 8 12 </pre> <p> <strong>Example 3</strong> </p> <pre> #include int main() { int i; for(i=0;;i++) { printf('%d',i); } } </pre> <p> <strong>Output</strong> </p> <pre> infinite loop </pre> <h4>Properties of Expression 3 <ul> <li>Expression 3 is used to update the loop variable.</li> <li>We can update more than one variable at the same time.</li> <li>Expression 3 is optional.</li> </ul> <p> <strong>Example 1</strong> </p> <pre> #include void main () { int i=0,j=2; for(i = 0;i<5;i++,j=j+2) { printf(\'%d %d
\',i,j); } < pre> <p> <strong>Output</strong> <pre> 0 2 1 4 2 6 3 8 4 10 </pre> </p><h3>Loop body</h3> <p>The braces {} are used to define the scope of the loop. However, if the loop contains only one statement, then we don't need to use braces. A loop without a body is possible. The braces work as a block separator, i.e., the value variable declared inside for loop is valid only for that block and not outside. Consider the following example.</p> <pre> #include void main () { int i; for(i=0;i<10;i++) { int i="20;" printf(\'%d \',i); } < pre> <p> <strong>Output</strong> </p> <pre> 20 20 20 20 20 20 20 20 20 20 </pre> <h3>Infinitive for loop in C</h3> <p>To make a for loop infinite, we need not give any expression in the syntax. Instead of that, we need to provide two semicolons to validate the syntax of the for loop. This will work as an infinite for loop.</p> <pre> #include void main () { for(;;) { printf('welcome to javatpoint'); } } </pre> <p>If you run this program, you will see above statement infinite times.</p> <hr></10;i++)></pre></5;i++,j=j+2)></pre></h4></4,k<8,j<10;i++)></pre></=4;i++)></pre></5;i++)> Egenskaper for uttrykk 2
- Uttrykk 2 er et betinget uttrykk. Den sjekker om en bestemt betingelse er oppfylt. Hvis den ikke er det, avsluttes sløyfen.
- Uttrykk 2 kan ha mer enn én betingelse. Løkken vil imidlertid iterere til den siste betingelsen blir falsk. Andre forhold vil bli behandlet som uttalelser.
- Uttrykk 2 er valgfritt.
- Uttrykk 2 kan utføre oppgaven med uttrykk 1 og uttrykk 3. Det vil si at vi kan initialisere variabelen samt oppdatere loop-variabelen i selve uttrykk 2.
- Vi kan sende null eller ikke-null verdi i uttrykk 2. Men i C er enhver verdi som ikke er null sann, og null er usann som standard.
Eksempel 1
setinterval javascript
#include int main() { int i; for(i=0;i<=4;i++) { printf(\'%d \',i); } < pre> <p> <strong>output</strong> </p> <pre> 0 1 2 3 4 </pre> <p> <strong>Example 2</strong> </p> <pre> #include int main() { int i,j,k; for(i=0,j=0,k=0;i<4,k<8,j<10;i++) { printf(\'%d %d %d
\',i,j,k); j+="2;" k+="3;" } < pre> <p> <strong>Output</strong> </p> <pre> 0 0 0 1 2 3 2 4 6 3 6 9 4 8 12 </pre> <p> <strong>Example 3</strong> </p> <pre> #include int main() { int i; for(i=0;;i++) { printf('%d',i); } } </pre> <p> <strong>Output</strong> </p> <pre> infinite loop </pre> <h4>Properties of Expression 3 <ul> <li>Expression 3 is used to update the loop variable.</li> <li>We can update more than one variable at the same time.</li> <li>Expression 3 is optional.</li> </ul> <p> <strong>Example 1</strong> </p> <pre> #include void main () { int i=0,j=2; for(i = 0;i<5;i++,j=j+2) { printf(\'%d %d
\',i,j); } < pre> <p> <strong>Output</strong> <pre> 0 2 1 4 2 6 3 8 4 10 </pre> </p><h3>Loop body</h3> <p>The braces {} are used to define the scope of the loop. However, if the loop contains only one statement, then we don't need to use braces. A loop without a body is possible. The braces work as a block separator, i.e., the value variable declared inside for loop is valid only for that block and not outside. Consider the following example.</p> <pre> #include void main () { int i; for(i=0;i<10;i++) { int i="20;" printf(\'%d \',i); } < pre> <p> <strong>Output</strong> </p> <pre> 20 20 20 20 20 20 20 20 20 20 </pre> <h3>Infinitive for loop in C</h3> <p>To make a for loop infinite, we need not give any expression in the syntax. Instead of that, we need to provide two semicolons to validate the syntax of the for loop. This will work as an infinite for loop.</p> <pre> #include void main () { for(;;) { printf('welcome to javatpoint'); } } </pre> <p>If you run this program, you will see above statement infinite times.</p> <hr></10;i++)></pre></5;i++,j=j+2)></pre></h4></4,k<8,j<10;i++)></pre></=4;i++)> Eksempel 2
#include int main() { int i,j,k; for(i=0,j=0,k=0;i<4,k<8,j<10;i++) { printf(\\'%d %d %d
\\',i,j,k); j+="2;" k+="3;" } < pre> <p> <strong>Output</strong> </p> <pre> 0 0 0 1 2 3 2 4 6 3 6 9 4 8 12 </pre> <p> <strong>Example 3</strong> </p> <pre> #include int main() { int i; for(i=0;;i++) { printf('%d',i); } } </pre> <p> <strong>Output</strong> </p> <pre> infinite loop </pre> <h4>Properties of Expression 3 <ul> <li>Expression 3 is used to update the loop variable.</li> <li>We can update more than one variable at the same time.</li> <li>Expression 3 is optional.</li> </ul> <p> <strong>Example 1</strong> </p> <pre> #include void main () { int i=0,j=2; for(i = 0;i<5;i++,j=j+2) { printf(\\'%d %d
\\',i,j); } < pre> <p> <strong>Output</strong> <pre> 0 2 1 4 2 6 3 8 4 10 </pre> </p><h3>Loop body</h3> <p>The braces {} are used to define the scope of the loop. However, if the loop contains only one statement, then we don't need to use braces. A loop without a body is possible. The braces work as a block separator, i.e., the value variable declared inside for loop is valid only for that block and not outside. Consider the following example.</p> <pre> #include void main () { int i; for(i=0;i<10;i++) { int i="20;" printf(\\'%d \\',i); } < pre> <p> <strong>Output</strong> </p> <pre> 20 20 20 20 20 20 20 20 20 20 </pre> <h3>Infinitive for loop in C</h3> <p>To make a for loop infinite, we need not give any expression in the syntax. Instead of that, we need to provide two semicolons to validate the syntax of the for loop. This will work as an infinite for loop.</p> <pre> #include void main () { for(;;) { printf('welcome to javatpoint'); } } </pre> <p>If you run this program, you will see above statement infinite times.</p> <hr></10;i++)></pre></5;i++,j=j+2)></pre></h4></4,k<8,j<10;i++)> Eksempel 3
#include int main() { int i; for(i=0;;i++) { printf('%d',i); } } Produksjon
infinite loop
Egenskaper for uttrykk 3 - Uttrykk 3 brukes til å oppdatere loop-variabelen.
- Vi kan oppdatere mer enn én variabel samtidig.
- Uttrykk 3 er valgfritt.
Eksempel 1
i.neste java
#include void main () { int i=0,j=2; for(i = 0;i<5;i++,j=j+2) { printf(\\'%d %d
\\',i,j); } < pre> <p> <strong>Output</strong> <pre> 0 2 1 4 2 6 3 8 4 10 </pre> </p><h3>Loop body</h3> <p>The braces {} are used to define the scope of the loop. However, if the loop contains only one statement, then we don't need to use braces. A loop without a body is possible. The braces work as a block separator, i.e., the value variable declared inside for loop is valid only for that block and not outside. Consider the following example.</p> <pre> #include void main () { int i; for(i=0;i<10;i++) { int i="20;" printf(\\'%d \\',i); } < pre> <p> <strong>Output</strong> </p> <pre> 20 20 20 20 20 20 20 20 20 20 </pre> <h3>Infinitive for loop in C</h3> <p>To make a for loop infinite, we need not give any expression in the syntax. Instead of that, we need to provide two semicolons to validate the syntax of the for loop. This will work as an infinite for loop.</p> <pre> #include void main () { for(;;) { printf('welcome to javatpoint'); } } </pre> <p>If you run this program, you will see above statement infinite times.</p> <hr></10;i++)></pre></5;i++,j=j+2)> Løkkekropp
Klammerne {} brukes til å definere omfanget av løkken. Men hvis løkken inneholder bare én setning, trenger vi ikke å bruke klammeparenteser. En løkke uten kropp er mulig. Klammerne fungerer som en blokkseparator, det vil si at verdivariabelen som er erklært inne for løkke er gyldig bare for den blokken og ikke utenfor. Tenk på følgende eksempel.
#include void main () { int i; for(i=0;i<10;i++) { int i="20;" printf(\\'%d \\',i); } < pre> <p> <strong>Output</strong> </p> <pre> 20 20 20 20 20 20 20 20 20 20 </pre> <h3>Infinitive for loop in C</h3> <p>To make a for loop infinite, we need not give any expression in the syntax. Instead of that, we need to provide two semicolons to validate the syntax of the for loop. This will work as an infinite for loop.</p> <pre> #include void main () { for(;;) { printf('welcome to javatpoint'); } } </pre> <p>If you run this program, you will see above statement infinite times.</p> <hr></10;i++)> Infinitiv for loop i C
For å gjøre en for-løkke uendelig, trenger vi ikke gi noe uttrykk i syntaksen. I stedet for det, må vi gi to semikolon for å validere syntaksen til for-løkken. Dette vil fungere som en uendelig for loop.
#include void main () { for(;;) { printf('welcome to javatpoint'); } } Hvis du kjører dette programmet, vil du se setningen ovenfor uendelig mange ganger.