The part where lite-c does not even try to expand the macro. If you look at it it will compile without errors even though there is an obvious error in the expansion text of the macro. And the fact that visual studio will compile and run an equivalent program with no errors or warnings. The preprocessor should only be looking for "," and ")" while parsing the input text of the macro and will not care about the ";". The preprocessor in lite-c should work at least as good as the one for the old cp/m OS called small-c.