WORD与DWORD

在看C/C++的书或者试题时，有时会见到利用word或dword定义的变量，第一次看到的时候并不知其是什么，更不用说word或dword占几个字节了。幸好在VC安装文件夹下有相关的定义。如C:\Program Files\Microsoft Visual Studio\VC98\Include查看头文件WINDEF.H的定义：

typedef unsigned long       DWORD;

typedef int                 BOOL;

typedef unsigned char       BYTE;

typedef unsigned short      WORD;

typedef float               FLOAT;

typedef FLOAT               *PFLOAT;

typedef BOOL near           *PBOOL;

typedef BOOL far            *LPBOOL;

typedef BYTE near           *PBYTE;

typedef BYTE far            *LPBYTE;

typedef int near            *PINT;

typedef int far             *LPINT;

typedef WORD near           *PWORD;

typedef WORD far            *LPWORD;

typedef long far            *LPLONG;

typedef DWORD near          *PDWORD;

typedef DWORD far           *LPDWORD;

typedef void far            *LPVOID;

typedef CONST void far      *LPCVOID;

      从以上定义可以发现，WORD占2个字节，DWORD占4个字节。