C Program To Find The Sum Of n Natural Numbers

    /*Write a c program to find the sum of natural numbers using the formula
                sum=n(n+1)/2 by direct method  */
#include <stdio.h>
#include <stdlib.h>

int main()
{
    int n, sum=0;
    printf("Enter the value for n:\n");
        scanf("%d",&n);
    sum =n*(n+1)/(2.0);
    printf("The sum of the first %d natural numbers is %d \n",n,sum);

    return 0;
}

Out Put:

Enter the value for n:
6
The sum of the first 6 natural numbers is 21