Visual Studio 7

Hi!

Why does this code not work?



const int INTSIZE = sizeof(int); //sizeof(int) = 4

#if (INTSIZE!=4)
//do something
#endif



INTSIZE is 0!!! in the #if statment above, why??

INTSIZE is an integer variable that will only exist when the code is running. #if is a compile time only test. Since INTSIZE has no value at compile time, it will evaluate to zero. If you really want to do a one time capture of sizeof(int) you can try this instead:

#define INTSIZE (sizeof(int))

Then your #if will work.

The "#" is for conditional compilation, so just test with a normal if

if( INT_SIZE !+ 4){

//do stuff

}