Rounding in C Preprocessor

Question

Hi,

I am defining some values in the preprocessor. e.g.

#define a 1000
#define b 0.5*a

when I try to use b in a place where integer is needed I get an error. I don't want to cast b always in my code and do it once in the #define line, is that possible?

Answer 1

Try this:

#define a 1000
#define b (a/2)

Answer 2

#define b ((int)(a * 0.5))