Data Type Ranges
C/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 |
| 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 |
| 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 | 10 | none | 1.2E +/- 4932 (19 digits) |
The long double data type (80-bit, 10-byte precision) is mapped directly to double (64-bit, 8- byte precision) in Windows NT and Windows 95.
Signed and unsigned are modifiers that can be used with any integral type. The char type is signed by default, but you can specify /J to make it unsigned by default.
The int and unsigned int types have the size of the system word. This is two bytes (the same as short and unsigned short) in MS-DOS and 16-bit versions of Windows, and 4 bytes in 32-bit operating systems. 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 .