Question

I’m just a beginner for C programming.
Can I ask a simple question ?
What’s the difference between (int) sizeof(void *) and int ?

ex)

#define ptrint          int
#define PTRINT          ((int) sizeof(void *))

Answer 1

The first case acts as an alias for int so you can use ptrint instead of int.

The second case is the size of a pointer in bytes. So for instance on a 32 bit system it will return 4.

ptrint a = 8;
ptrint b = a;

int sizeofptr = PTRINT;