Sum of digits of a number program using recursion.

/*C program to find sum of all digits using recursion.*/
 
#include <stdio.h>
 
//function to calculate sum of all digits
int sumDigits(int num)
{
    static int sum=0;
    if(num>0)
    {
        sum+=(num%10); //add digit into sum
        sumDigits(num/10);
    }
    else
    {
        return sum;
    }
}
int main()
{
    int number,sum;
     
    printf("Enter a positive integer number: ");
    scanf("%d",&number);
     
    sum=sumDigits(number);
     
    printf("Sum of all digits are: %d\n",sum);
 
    return 0;
}

Output

Enter a positive integer number: 1230
Sum of all digits are: 6