C + + Common data types

Basic built-in types

C + + provides programmers with a rich range of built-in data types and user-defined data types. The following table lists seven basic C + + data types:

type	Key Words
Boolean type	bool
Character type	Char
Integral type	Int
Floating point Type	Float
Double floating point type	Double
No type	void
Wide character type	wchar_t

Some basic types can be decorated with one or more type modifiers:

• Signed
• Unsigned
• Short
• Long

The following table shows the memory that is required for various variable types to store values in memory, and the maximum and minimum values that can be stored by variables of that type.

Note: different systems will vary.

1#include <iostream>2 3 using namespacestd;4 5 intMain ()6 {7     //Print the maximum value of type int8cout <<"int type maximum:"<< Int_max <<Endl;9     //Print the minimum value of type intTencout <<"type of int minimum value:"<< Int_min <<Endl; One     //Print the number of bytes that int occupies Acout <<"int type byte number:"<<sizeof(int); -     return 0; -}

type	Number of bits (bytes)	Range
Char	8-bit, 1-byte	128 to 127 or 0 to 255
unsigned char	8-bit, 1-byte	0 to 255
Signed Char	8-bit, 1-byte	128 to 127
Int	32-bit, 4-byte	2147483648 to 2147483647
unsigned int	32-bit, 4-byte	0 to 4294967295
Signed int	32-bit, 4-byte	2147483648 to 2147483647
Short int	16-bit, 2-byte	32768 to 32767
unsigned short int	16-bit, 2-byte	0 to 65,535
Signed Short int	16-bit, 2-byte	32768 to 32767
Long int	64-bit, 8-byte	9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
Signed Long int	64-bit, 8-byte	9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
unsigned long int	64-bit, 8-byte	0 to 18,446,744,073,709,551,615
Float	32-bit, 4-byte	+/-3.4e +/-38 (up to a number)
Double	32-bit, 8-byte	+/-1.7e +/-308 (~15 digits)
Long double	128-bit, 16-byte	+/-1.7e +/-308 (~15 digits)
wchar_t	2 or 4 bytes	1 wide characters

As you can tell from the table above, the size of the variable varies depending on the compiler and the computer you are using.

C + + Common data types