Programming Languages

Welcome to coding world

C Program to find the sum of natural numbers using while loop

#include <stdio.h>

int main()

{

    int n, count, sum = 0;

 

    printf("Enter the value of n(positive integer): ");

    scanf("%d",&n);

 

    /* When you use while loop, you have to initialize the

     * loop counter variable before the loop and increment

     * or decrement it inside the body of loop like we did

     * for the variable "count"

     */

    count=1;

    while(count <= n){

                sum = sum + count;

                count++;

    }

 

    printf("Sum of first %d natural numbers is: %d",n, sum);

 

    return 0;

}

Output:

 Enter the value of n(positive integer): 7

Sum of first 7 natural numbers is: 28