Why doesn't return modify the value of a parameter to a function

Question

Possible Duplicate:
How to modify content of the original variable which is passed by value?

I am building a

Answer 1

You need to assign the return value of FindArea to rArea. At the moment, FindArea assigns the product to its local variable of the same name.

Alternatively, you can pass the address of main's rArea to modify that, that would look like

FindArea(&rArea, rBase, rHeight);

in main with

void FindArea(int * rArea, int rBase, int rHeight) {
    *rArea = rBase * rHeight;
}