C program to find the sum of first n natural numbers.

C Programming Language Loop control in C Language (Article) Loop control in C Language (Program)

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Program:

#include<stdio.h>
int main()
{
    int i,n,s=0;
    printf("Enter value of n:");
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        s=s+i;
    }
    printf("Sum = %d \n",s);
    return 0;
}

Output:

Enter value of n:10
Sum = 55
Press any key to continue . . .

Explanation:

This program prints the sum of first n natural numbers. A number is asked from the user and stored in variable n. For loop is used to add numbers from 1 to n and store the sum in s. Variable i is used for looping and it is incremented on each iteration. The condition is checked and until i is less than or equal to n, the loop runs. Finally the value of sum is printed after terminating the loop.

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