mikrocodemos/sum-of-digits-using-recursion

#include<stdio.h>

int find_sum(int a, int mod);   // function prototype declaration

int main()
{
    int a,digit,mod;
    printf("enter any digit number except single digit");
    scanf("%d",&a);
    digit=find_sum(a,mod);
    
}

int find_sum(int a, int mod) // function definition
{
   static int add=0;
   while (a!=0) 
    {
        mod=a%10;
        a=a/10;
        add=add+mod;
    }
    printf("\nthe sum of digits is%d",add);
    return 0;
}