Data Types are used everywhere in a programming language.
It means, that you cannot use variable without data types. Data types are used
to inform the compiler about what type value variable can store? This is a set
of values and allowable operations on those values. Such as if you want to work
with int value then you will have to assign int type variable to work with.
C-Sharp provides two types of data
types
- Value Types.
- Reference Types.
- Value Types
These data types contain the directly
value. These types are created on the stack and derived from the class System.ValueType.
Primitive types (Except strings), Enumeration, Structure are Value types.
Primitive Types
Bool: Bool is one of the simple data
types. It can contain only 2 values – “false” or “true”. The default value of
Bool is “false”.
Int: Int is short for integer, a data
type for storing number without decimals. When working with numbers, int is the
most commonly used data type. Integers have several data types within C#
depending on the size of the number they are supposed to store.
Type
|
Type Map
|
Default
|
Size
|
Range
|
Sbyte
|
System.SByte
|
0
|
1
byte
|
-128
to 127
|
Byte
|
System.Byte
|
0
|
1
byte
|
0
to 255
|
Short
|
System.Int16
|
0
|
2
byte
|
-32,768
to 32,767
|
Ushort
|
System.UInt16
|
0
|
2
byte
|
0
to 65,535
|
Int
|
System.Int32
|
0
|
4
byte
|
-2,147,483,648
to 2,147,483,647
|
Uint
|
System.UInt32
|
0
|
4
byte
|
0
to 4,294,967,295
|
Long
|
System.Int64
|
0L
|
8
byte
|
-9,223,372,036,854,775,808
to 9,223,372,036,854,775,807
|
Ulong
|
System.UInt64
|
0
|
8
byte
|
0
to 18,446,744,073,709,551,615
|
Example: 1
 |
| Example Input |
 |
| Example Output |
Char: Char is used for storing a single
character.
Float: Float is one of the data types used
to store the decimal value. In C# we
have three floating point types: float, double, and decimal.
Type
|
Type Map
|
Default
|
Size
|
Range
|
Float
|
System.Single
|
0
|
4
byte
|
1.5
x 10-45 to 3.4 x 1038
|
Double
|
System.Double
|
0
|
8
byte
|
5.0
x 10-324 to 1.7 x 10308
|
Decimal
|
System.Decimal
|
0D
|
16
byte
|
1.0
x 10-28 to 7.9 x 1028
|
Example: 2
 |
| Example Input |
 |
| Example Output |
- Reference Types
The Reference types do not contain the actual data stored
in a variable, but they contain a reference to the variables. Reference types
are created on the Heap. The lifetime of the reference type is managed by the
.NET framework. The default value for reference types is null reference.
Assignment to a variable of a reference type creates a copy of the reference
rather than a copy of the referenced value. Classes, strings, interfaces,
arrays, and delegates are reference types.
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