Using Data Types

Data Types and Sizes

Data Type	32 Bit	64 Bit
char	8	8
short	16	16
int	32	32
long	32	64
long long	64	64
pointer	32	64
float	32	32
double	64	64
long double*	64	128
void*	32	64

Note that in 64-bit mode, types long and int have different sizes and ranges; a long always has the same size as a pointer. A pointer (or address) has 64-bit representation in 64-bit mode and 32-bit representation in 32-bit mode. An int has a smaller range than a pointer in 64-bit mode.

Characteristics of integral types and floating point types are defined in the standard files limits.h and float.h.