일반 Visual Studio - Data Type Ranges
2013.03.26 17:49
Microsoft Visual C++ recognizes the types shown in the table below.
| Type Name | Bytes | Other Names | Range of Values |
|---|---|---|---|
| int | * | signed, signed int | System dependent |
| unsigned int | * | unsigned | System dependent |
| __int8 | 1 | char, signed char | –128 to 127 |
| __int16 | 2 | short, short int, signed short int | –32,768 to 32,767 |
| __int32 | 4 | signed, signed int | –2,147,483,648 to 2,147,483,647 |
| __int64 | 8 | none | –9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 |
| bool | 1 | none | false or true |
| char | 1 | signed char | –128 to 127 |
| unsigned char | 1 | none | 0 to 255 |
| short | 2 | short int, signed short int | –32,768 to 32,767 |
| unsigned short | 2 | unsigned short int | 0 to 65,535 |
| long | 4 | long int, signed long int | –2,147,483,648 to 2,147,483,647 |
| long long | 8 | none (but equivalent to __int64) | –9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 |
| unsigned long | 4 | unsigned long int | 0 to 4,294,967,295 |
| enum | * | none | Same as int |
| float | 4 | none | 3.4E +/- 38 (7 digits) |
| double | 8 | none | 1.7E +/- 308 (15 digits) |
| long double | same as double | none | same as double |
| wchar_t | 2 | __wchar_t | 0 to 65,535 |
A variable of __wchar_t designates a
wide-character or multibyte character type. By default wchar_t is a typedef for
unsigned short. Use the L prefix before a character or string constant to
designate the wide-character-type constant. When compiling with /Zc:wchar_t or
/Za, the compiler can distinguish between an unsigned short and wchar_t for
function overload purposes.
Signed and unsigned are modifiers that can
be used with any integral type except bool. The char type is signed by default,
but you can specify /J (compiler option) to make it unsigned by default.
The int and unsigned int types have the
size of the system word: four bytes. However, portable code should not depend
on the size of int.
Microsoft C/C++ also features support for
sized integer types. See __int8, __int16, __int32, __int64 for more
information. Also see Integer Limits.
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