Sum of first N natural numbers

Posted on Apr 7, 2020

C program to find the sum of first N natural numbers, N must be taken by the user.

Program

#include<stdio.h>
#include<conio.h>
void main()
{
	int n, i, sum = 0;

    printf("Enter the value of N\t:");
    scanf("%d",&n);

    for(i=1;i<=n;i++)
    {
        sum = sum + i;
    }

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

Output

Enter the value of N    :6
Sum of first 6 natural numbers is 21