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C - While Loop





In the while loop of C language, the condition of while loop is tested for the boolean value - true or false.






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 ends 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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