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csharp data types





C# Data Types

 

  • C# is a rich language that is why every variable has a data type in it.
  • Data types assign the type of the value stored in a variable.
  • There are several data types are present in C# which are used by the programmer at the time of creation of program.

In C# data types are categorized into three parts which are given below:

 

  • Value Type
  • Reference Type
  • Pointer Type

csharp-datatype

Value Types

 

    • Value type data types are those data types which contains the actual data value.
    • These data types are of fixed length and stored on the stack of memory.
    • These data types are stored the copy of the value.
    • They are derived from the System.ValueType Class.

We can further classify the Value Types into two parts :

 

      • User-Defined
      • Pre-Defined
User-Defined Types

 

User-Defined types are those value types which are defined by the users. There are two types of User-Defined types present in C# given below in the table:

csharp-datatype

Pre-Defined Types

 

Predefined Types are those value types which are already defined in C#.Following table contains all the Pre-Defined value data types of C#:

 

Type Represents Range Default Value
bool Boolean value True or False False
byte 8-bit unsigned integer 0 to 255 0
char 16-bit Unicode character U +0000 to U +ffff ‘’
decimal 128-bit precise decimal values with 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 type (+/-)5.0 x 10-324 to (+/-)1.7 x 10308 0.0D
float 32-bit single-precision floating point type -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 -9,223,372,036,854,775,808 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

Reference Type

 

      • Reference Type data types are those data types which contains the reference of the value.
      • These data types are of varied length and stored on the heap in memory.
      • These data types do not contain copy of value like Value Type. On the other side these contain address of the value.

We can also classify Reference Type into two categories:

 

      • User-Defined
      • Pre-Defined
User-Defined Types

 

User-Defined Reference Types are those data types which are defined by the users. Following tables contains the User-Defined Reference Type present in C#:

csharp-datatype

Pre-Defined Types

 

Pre-Defined Reference Types are those data types which are already defined in C#. Following table tells us about the Pre-Defined Reference type present in C#:

csharp-datatype

Pointer Type

 

      • Pointer type data type is only used in the context of unsafe code.
      • Pointer Types variables are basically used to store the memory address of variable of any other data type.
      • We are giving here the syntax of pointer type data type:
datatype * identifier;



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