Size of #define values

Question

If a value is defined as

#define M_40 40

Is the size the same as a short (2 bytes) or is it as a char (1 byte) or

Answer 1

A plain integer is going to be implicitly cast to int in all calculations and assignments.

#define simply tells the preprocessor to replace all references to a symbol with something else. This is the same as doing a global find-replace on your code and replacing M_40 with 40.