一些标准定义的类型

Type	Description	Declared in

intptr_t (long integer or __int64, depending on the target platform)

Stores a pointer (or HANDLE) on both Win32 and Win64 platforms.

STDDEF.H and other include files

 2

ptrdiff_t integer

Result of subtraction of two pointers.

STDDEF.H

3

size_t unsigned integer

Result of sizeof operator.

STDDEF.H and other include files

4

uintptr_t (long integer or __int64, depending on the target platform)

An unsigned int or unsigned __int64 version of intprt_t.

STDDEF.H and other include files

5

wchar_t internal type of a wide character

Useful for writing portable programs for international markets.

STDDEF.H, STDLIB.H