Learn c#--data type from scratch (iii)

C # Data types

In C #, variables are divided into the following types:

• Value type
• Reference type
• Pointer type

Value type

Value type variables can be directly assigned to a value, and they are derived from the class System.valuctpyc.

Value types directly contain data, such as int, char, and float, which store numbers, letters, and floating-point values, respectively. When you declare an int type, the system allocates memory to store the value.

The following table lists the value types:

type	Description	Range	Default Value
bool	Boolean value	True or False	False
Byte	8-bit unsigned integer	0 to 255	0
Char	16-bit Unicode characters	U +0000 to u +ffff	' + '
Decimal	128-bit exact decimal value, 28-29 significant digits	( -7.9 x 1028 to 7.9 x 1028)/100 to 28	0.0M
Double	64-bit double-precision floating-point	(+/-) 5.0 x 10-324 to (+/-) 1.7 x 10308	0.0D
Float	32-bit single-precision floating-point	-3.4 x 1038 to + 3.4 x 1038	0.0F
Int	32-bit signed integer type	2,147,483,648 to 2,147,483,647	0
Long	64-bit signed integer type	923,372,036,854,775,808 to 9,223,372,036,854,775,807	0L
SByte	8-bit signed integer type	128 to 127	0
Short	16-bit signed integer type	32,768 to 32,767	0
UInt	32-bit unsigned integer type	0 to 4,294,967,295	0
ULong	64-bit unsigned integer type	0 to 18,446,744,073,709,551,615	0
UShort	16-bit unsigned integer type	0 to 65,535	0

If you need to get the exact size of a type or a variable on a particular platform, you can use the Sizcof method. The expression sizeof (Tpye) produces storage dimensions that store objects or types in bytes. Below violently get any machine on the INT storage size:

using System; namespace datatypeapplication{    class  program    {        staticvoid Main ( string [] args)        {            System.Console.WriteLine ("Size of int:{0}",sizeof(  int));            System.Console.ReadKey ();     }}}

Compile results

Learn c#--data type from scratch (iii)