C# .Net – Variables


Definition1: Variable is an identity given to memory location.

Definition2: Variable is a named memory location

	datatype identity = value;

	String name = "Amar";
	int age = 23;
	char gender = 'M';
	bool married = false;
	double salary = 35000.00;

Declaration, Assignment, Update and Initialization of Variable:

  • Declaration: creating a variable without any value.
    • int a ;
  • Assignment: Storing a value into variable which is already declared.
    • a = 10 ;
  • Modify: Increase or Decrease the value of variable.
    • a = a + 5 ;
  • Initialization: Assigning value at the time of declaration
    • int  b = 20 ;

Identifier rules:

  • Identifier is a name given to class, method, variable etc.
  • Identifier must be unique
  • Identifier is used to access the member.

Rules to create identifier:

  • Identifier allows [A-Z] or [a-z] or [0-9], and underscore(_).
  • Spaces not allowed in identifier.
  • Identifier should not start with digit.
  • Identifier can starts with special symbol.
  • We can’t use the C# .Net reserved keywords as an identifier.
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