#if 0

[Null]

I found this in few .h files:

#if 0
#if something
#define something
#endif
#endif 

so what #if 0 does?

[Bazzy]

Some people use it to avoid the compilation of some part of code ( something similar to commenting the code out )

#if 0

     cout << "This won't be compiled so you won't see this line";

#endif

cout << "This would be compiled and executed so you will see this line";