Using recursion to sum numbers

Question

I have just been studying the concept of recursion and I thought that I would try a simple example. In the following code, I am attempting to take the numbers: 1, 2, 3, 4, 5, an

Answer 1

You're returning 1 in the else clause. You should be returning 0:

else
{
    return 0;
}

If the value is not greater than zero, why would you return one in the first place?