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for loop in C programming

Loops are used to iterate program execution based on some conditions and requirements. For loop is widely used when we require a set of statements are to be executed for a number of times. Here some examples of for loops.

#include <stdio.h>
int main(void){
for(int i=0; i<=3; i++){
printf("\n %d",i); // printing the value of i
}
return 0;
}

The above code will give this output.

0
1
2
3

As you have seen we have declared the variable i in the for loop and used it. So this value is localized within this loop.

Nested for loops

We will use one inside other for loop to check how the value of i changes, here is the code.
The output of the above code is here .

#include <stdio.h>
int main(void){

for(int i=0; i<=2; i++){
printf("\n outside = %d",i);

for(int i=0; i<=4; i++){
printf("\n inside = %d",i);
}

}
return 0; }

The output is here

outside = 0
inside = 1
inside = 2
inside = 3
inside = 4
outside = 1
inside = 1
inside = 2
inside = 3
inside = 4
outside = 2
inside = 1
inside = 2
inside = 3
inside = 4

C programming Basics
printf : Sending output to screen scanf : Reading data from user or keyboard as input to C program comments : Using comments inside C program for loop in C program if else condition in C program switch statment to execute part of the program in C program getchar function to read data from keyboard putchar function to display single data

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for loop in C programming

#include <stdio.h> int main(void){ for(int i=0; i<=3; i++){ printf("\n %d",i); // printing the value of i } return 0; }

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Nested for loops

#include <stdio.h> int main(void){ for(int i=0; i<=2; i++){ printf("\n outside = %d",i); for(int i=0; i<=4; i++){ printf("\n inside = %d",i); } } return 0; }

outside = 0 inside = 1 inside = 2 inside = 3 inside = 4 outside = 1 inside = 1 inside = 2 inside = 3 inside = 4 outside = 2 inside = 1 inside = 2 inside = 3 inside = 4

#include <stdio.h>
int main(void){
for(int i=0; i<=3; i++){
printf("\n %d",i); // printing the value of i
}
return 0;
}

0
1
2
3

#include <stdio.h>
int main(void){

for(int i=0; i<=2; i++){
printf("\n outside = %d",i);

for(int i=0; i<=4; i++){
printf("\n inside = %d",i);
}

}
return 0; }

outside = 0
inside = 1
inside = 2
inside = 3
inside = 4
outside = 1
inside = 1
inside = 2
inside = 3
inside = 4
outside = 2
inside = 1
inside = 2
inside = 3
inside = 4