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C language provides us an important looping structure using which we could execute one or multiple statements within a loop until a condition is met. The condition of while loop is tested for the boolean value - true or false.

• If the condition is true then the block of statements in while loop are executed.
• If the condition is false then the block of statements in the while loop are skipped and not executed.

while loop example

/* C - while loop example */

#include<stdio.h>

int main() /*main method starts*/
{

int i=0;

while(i<5)
{
	printf("i = %d \n", i);
	i++;
}

return 0;
}   /* main method ends and program ends too */

Output

i = 0
i = 1
i = 2
i = 3
i = 4

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While loop must have an iteration part in its body or it runs an endless loop

/* Endless while loop */

#include<stdio.h>

int main() //main method starts
{

int i=0;

while(i<5)
{
	printf("i = %d \n" + i);
}

return 0;
}  /*main method and program ends here */

Output

This program when executed, runs indefinitely in a loop because of the absence of incremental part to increment the value of i.

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