When is a Macro better than a Function ?
Rules of Thumb: - operation required is short, simple and (maybe) used in different locations (files). - operation required is short, simple and is used intensively. - operation required is performed on variety of different types.
Examples of last case: #define MAX(a,b) (((a)>(b)) ? (a) : (b)) #define SWAP(type,a,b) {type t=a; (a)=(b); (b)=t;} Use: int a,b; /* assign some value… */ double x = MAX(a,b); SWAP(a,b);