Basic data types for C + +

Basic Type

The C + + language has a set of basic types that correspond to the basic storage units of a computer and some common ways to use these cells to save data:

The basic data types are as follows:

Name	Description	size*	range*
char	Character or small integer.	1byte	Signed: -128 to 127 unsigned:0 to 255
short int(short)	Short Integer.	2bytes	Signed: -32768 to 32767 Unsigned:0 to 65535
int	Integer.	4bytes	Signed: -2147483648 to 2147483647 unsigned:0 to 4294967295
long int(long)	Long Integer.	4bytes	Signed: -2147483648 to 2147483647 unsigned:0 to 4294967295
bool	Boolean value. It can take one of the values:true or false.	1byte	trueOrfalse
float	Floating point number.	4bytes	+/-3.4e +/-(digits)
double	Double precision floating point number.	8bytes	+/-1.7e +/-308 (~15 digits)
long double	A Long double precision floating point number.	8bytes	+/-1.7e +/-308 (~15 digits)
wchar_t	Wide character.	2 or 4 bytes	1 Wide character

In addition, users can also define:

Enumeration type (enum) for a specific set of values

Type void, indicating no information

Pointer types, such as int*

Array type, e.g. char[]

Reference types, such as double&

declaring Variables

int A;
float MyNumber;
Const double PI = 3.1415926;
extern int error_number;

const char * name = "Blue";
const char * season[] = {"Spring", "Summer", "Fall", "Winter"};

Void cannot directly define a variable other than

void avoid; Wrong! The void type cannot directly define a variable.

Declare multiple names:

int a,b,c;
int *p, y;//such a structure is not conducive to reading, should try to avoid
int v[10], *pv;//such a structure is not conducive to reading, should try to avoid

  Initialize Variables

The initialization variable is in the following form:

For example, initialize an integer variable of 0, for example

int a = 0;

There is another type of initialization variable:

For example

Basic data types for C + +