C + + data type Range

There are many basic data types in C + +, and we need to choose the right data type depending on the range of data that needs to be stored.

The Visual C + + 32-bit and 64-bit compilers recognize the types in the tables later in this article.

• int (unsignedint)

• __int8 (unsigned__int8)

• __int16 (unsigned__int16)

• __int32 (unsigned__int32)

• __int64 (unsigned__int64)

• Short (unsignedshort)

• Long (unsignedlong)

• Long Long (unsignedlonglong)

If the name starts with two underscores (__), the data type is non-standard.

The ranges specified in the following table contain both a start value and an end value.

Type name	Bytes	Other Name	Range of values
Int	4	Signed	–2,147,483,648 to 2,147,483,647
unsigned int	4	Unsigned	0 to 4,294,967,295
_int8	1	Char	–128 to 127
unsigned _int8	1	unsigned char	0 to 255
__int16	2	short, short int, signed short int	–32,768 to 32,767
unsigned __int16	2	unsigned short, unsigned short int	0 to 65,535
__int32	4	Signed, signed int, int	–2,147,483,648 to 2,147,483,647
unsigned __int32	4	unsigned, unsigned int	0 to 4,294,967,295
__int64	8	Long long, signed long long	–9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
unsigned __int64	8	unsigned long long	0 to 18,446,744,073,709,551,615
bool	1	No	False or True
Char	1	No	128 to 127 (default) 0 to 255 (when compiling with/j)
Signed Char	1	No	–128 to 127
unsigned char	1	No	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		0 to 4,294,967,295
Long Long	8	None (equivalent to __int64)	–9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
unsigned long long	8	None (equivalent to unsigned __int64)	0 to 18,446,744,073,709,551,615
Enum	Varies	No	A user-defined type that contains a set of named integer constants called enumerators.
Floating	4	No	3.4E +/-38 (7-digit)
Double	8	No	1.7E +/-308 (15-digit)
Long double	Same as Double	No	Same as Double
wchar_t	2	__wchar_t	0 to 65,535

__wchar_t  , depending on how it is used, specifies a wide character type or multibyte character type.   use   before character or string constants, L   prefix to specify wide character type constants.

signed   and   unsigned   is available for any integral type ( bool   The modifier of the exception).   Note, for mechanisms such as overloads and templates, Char , signed Char   and   unsigned char   is three different types.

The int and unsignedint types have a size of four bytes. However, because the language standard allows portable code to be implementation-specific, the code should not depend on the size of int .

C + + data type Range