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 #define value has no size, specifically. It's just text substitution. It depends on the context of where (and what) is being substituted.

In your example, where you use M_40, the compile will see 40, and usually treat it as in int.

However, if we had:

void SomeFunc(long);

SomeFunc(M_40);

It will be treated as a long.