Data Types in a programming language describes that what type of data a variable can hold . CSharp is a strongly typed language, therefore every variable and object must have a declared type. The CSharp type system contains three Type categories. They are Value Types , Reference Types and Pointer Types . In CSharp it is possible to convert a value of one type into a value of another type . The operation of Converting a Value Type to a Reference Type is called Boxing and the reverse operation is called Unboxing .
When we declare a variable, we have to tell the compiler about what type of the data the variable can hold or which data type the variable belongs to.
Syntax : DataType VariableName DataType : The type of data that the variable can hold
VariableName : the variable we declare for hold the values.
int count; int : is the data type
count : is the variable name
The above example shows , declare a variable 'count' for holding an integer values.
The following are the commonly using datatypes in C# .
The bool keyword is an alias of System.Boolean. It is used to declare variables to store the Boolean values, true and false. In C# , there is no conversion between the bool type and other types.
C# Runtime type : System.Boolean CSharp declaration : bool flag; CSharp Initialization : flag = true;
CSharp default initialization value : false
int variables are stored signed 32 bit integer values in the range of -2,147,483,648 to +2,147,483,647
C# Runtime type : System.Int32 CSharp declaration : int count; CSharp Initialization : count = 100;
CSharp default initialization value : 0
The decimal keyword denotes a 128-bit data type.The approximate range and precision for the decimal type are -1.0 X 10-28 to 7.9 X 1028
C# Runtime type : System.Decimal CSharp declaration : decimal val; CSharp Initialization : val = 0.12;
CSharp default initialization value : 0.0M
The string type represents a string of Unicode characters. string variables are stored any number of alphabetic,
numerical, and special characters .
C# Runtime type : System.String CSharp declaration : string str;
CSharp Initialization : str = "csharp string";