数据类型字节长度表

数据类型名称字节数别名取值范围int*signed,signed int由操作系统决定，即与操作系统的＂字长＂有关unsigned int*unsigned由操作系统决定，即与操作系统的＂字长＂有关__int81char,signed char–128 到 127__int162short,short int,signed short int–32,768 到 32,767__int324signed,signed int–2,147,483,648 到 2,147,483,647__int648无–9,223,372,036,854,775,808 到 9,223,372,036,854,775,807bool1无false 或 truechar1signed char–128 到 127unsigned char1无0 到 255short2short int,signed short int–32,768 到 32,767unsigned short2unsigned short int0 到 65,535long4long int,signed long int–2,147,483,648 到 2,147,483,647long long8none (but equivalent to __int64)–9,223,372,036,854,775,808 到 9,223,372,036,854,775,807unsigned long4unsigned long int0 到 4,294,967,295enum*无由操作系统决定，即与操作系统的＂字长＂有关float4无3.4E +/- 38 (7 digits)double8无1.7E +/- 308 (15 digits)long double8无1.7E +/- 308 (15 digits)wchar_t2__wchar_t0 到 65,535

类型标识符类型说明长度（字节）范围备注char字符型1-128 ~ 127-2⁷ ~ (2⁷ -1)unsigned char无符字符型10 ~ 2550 ~ (2⁸ -1)short int短整型2-32768 ~ 327672^-15 ~ (2¹⁵ - 1)unsigned short int无符短整型20 ~ 655350 ~ (2¹⁶ - 1)int整型4-2147483648 ~ 2147483647-2³¹ ~ (2³¹ - 1)unsigned int无符整型40 ~ 42949672950 ~ (2³²-1)float实型（单精度）41.18*10^-38 ~ 3.40*10³⁸ 7位有效位double实型（双精度）82.23*10^-308 ~ 1.79*10³⁰⁸ 15位有效位long double实型（长双精度）103.37*10^-4932 ~ 1.18*10⁴⁹³² 19位有效位