[Greg Ross]

Originally Posted by Dave Scheck

How about this...

#define incr(var,n) ((var) += (n))

Then your code would look like...
incr(x,10);
incr(y,5);

This allows a single macro to increment whatever variable is passed to it.

From your original question, though, you seem to be wanting to hide the BAR variable from the user. Is there a reason for that?

If you want to hide the variable, how about

#define FOO(x) (BAR += (x))

When you use the macro, then you will write

FOO(5);

instead of

FOO=5

and the precompiler will output

(BAR += 5);

(I wont go into the whys for the seemingly excess parentheses. We can go into that in a separate thread if desired.)