Is the sizeof(some pointer) always equal to four?

Question

For example: sizeof(char*) returns 4. As does int*, long long*, everything that I\'ve tried. Are there any exceptions to this?

Answer 1

Just for completeness and historic interest, in the 64bit world there were different platform conventions on the sizes of long and long long types, named LLP64 and LP64, mainly between Unix-type systems and Windows. An old standard named ILP64 also made int = 64-bit wide.

Microsoft maintained LLP64 where longlong = 64 bit wide, but long remained at 32, for easier porting.

Type           ILP64   LP64   LLP64
char              8      8       8
short            16     16      16
int              64     32      32
long             64     64      32
long long        64     64      64
pointer          64     64      64

Source: https://stackoverflow.com/a/384672/48026