Useful C Macros

Let's share the macros we use that make our C code really EXPERT!!

Right now I'm specifically interested in macros to add half-assed object orientation. Thanks!!

I'll contribute myself:
#define mainstart int main(int argc, char **argv) {

>>26
The 'do while' still needs a semicolon to end the statement, whereas a scope would not. This means that if(foo) swap(int, a, b); else bar(); will work with >24's solution, but not with a simple scope.