What is while Loop - C Statement

C examples for Statement:while

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Introduction

The general syntax for the while loop is as follows: 

while( expression )
  statement1;
statement2;

The following code use while loop to sum integers.

Demo Code

#include <stdio.h>

int main(void)
{
  unsigned long sum = 0UL;        // The sum of the integers
  unsigned int i = 1;             // Indexes through the integers
  unsigned int count = 0;         // The count of integers to be summed
  // Get the count of the number of integers to sum
  printf("\nEnter the number of integers you want to sum: ");
  scanf(" %u", &count);

  // Sum the integers from 1 to count
  while(i <= count)
    sum += i++;//  w  ww  .j av  a2s.  c  o m

  printf("Total of the first %u numbers is %lu\n", count, sum);
  return 0;
}

Result


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