Program to find the sum of digits of a number using recursion in C++.

Solution

#include <iostream>

using namespace std;

int sumdigit(int n)
{
    if (n == 0)
       return 0;
    return (n % 10 + sumdigit(n / 10));
}
 
int main()
{
    int n,ans;
    cout<<"Enter a number ";
    cin>>n;
    ans = sumdigit(n);
    cout << "Sum of digits in "<< n<<" is "<<ans;
    return 0;
}

Output :

Enter a number 124
Sum of digits in 124 is 7