C : Program to calculate the sum digits of a number.

Code:

#include<stdio.h>

#include<conio.h>

main()

{

        int x,n;

        printf("Enter a number :");

        scanf("%d",&n);

        x=sum_digit(n);

        printf("%d",x);

}

int sum_digit(int n)

{

        int s=0;

        while(n>0)

        {

                s=s + n%10;

                n=n/10;

        }

        return s;

}

Output: