I have an assingment that sound like this:

Draw a block diagram of recursive function that sums first N even numbers, where N is entered from keybord or in procedure that calling a function.

I have posted the JPG of my solution.

But this is not going to work. This looks like a loop.

I need to put a base case at the right place. I thought that the good base case should be N>0 but somthing is very wrong here :-s

Can someone can help me?

P.S. Sorry if this is in wrong thread.