To add to the above points Inline functions can be overloaded but Macros
cannot be overloaded.

Ex:

#define MYMAC(p) if(p) cout << "single pointer valid" << endl;

#define MYMAC(p h) if(h 1) cout << "pinter and H valid" << endl;

The second version replaces the macro. So a call to MYMAC(ptr) where ptr is
some pointer you get warnings that not enough arguments for the macro which is
because the second version has replaced the MYMAC definition.

#define ASPECT_RATIO 1.653

 error message may refer to 1.653 not ASPECT_RATIO.

2> Some time operators get incremented two times in case of macros

#define max(a b) ((a) > (b) ? (a) : (b))

max(++a b);   // a is incremented twice
((++a)>(b) ? (++a) :(b))