VC常用資料類型

VC常用資料類型(2006.11.26):

類型              位元組數 位元   範圍        備忘意:
char               1      8    -128-127
signed char        1      8    -128-127
unsigned char      1      8     0-255
short int          2      16   -32768-32767
signed short int   2      16   -32768-32767
unsigned short int 2      16   0-65535
int                4      32   -2147483648-2147483647
signed int         4      32   -2147483648-2147483647
unsigned int       4      32   0-4294967259
long int           4      32   -2147483648-2147483647
signed long int    4      32   -2147483648-2147483647
unsigned long int  4      32   0-4294967259
long            4         32  -2,147,483,648 to 2,147,483,647
float           4         32              3.4E +/- 38 (7 digits)
double          8         64              1.7E +/- 308 (15 digits)
long double     10        80               1.2E +/- 4932 (19 digits)
以下為windef.h中有關VC常用資料類型的定義:

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;
typedef int                 INT;
typedef unsigned int        UINT;
typedef unsigned int        *PUINT;
typedef WORD                ATOM;
1.使用sizeof( )可以得到任何對象佔用的位元組數，例如如果有一個char類型的變數a， 則sizeof(a)會返1.
2.還可以藉助typedef定義自己的資料類型，例如typedef myint unsigned int;後myint就等價於unsigned int.