Sum of all digits for a given Positive Number [closed]

Answer 1

Here's a string solution:

public int compute( int MethParam )
{
    int sum = 0; 
    string meth = MethParam.ToString();        

    for (char x in meth) {
        sum += int.Parse(x);
    }
    if (sum >= 10) {
        return compute(sum);
    }
    else {
        return sum;
    }
}

This code is in C# not Java so consider it pseudocode.