Boxing & UnBoxing

Boxing and Unboxing

• Boxing: Converting a variable value into "Object" type value implicitly.
• Unboxing:  Converting  the  "Object"  type  value  into  variable  explicitly  (using conversion                                 methods).

 Download above Code of Demo on Boxing and UnBoxing : Downloads Links

Variable Scopes

• A "variable scope" simply is something, which decides the lifetime of the variable.
• The variable scope depends on the place, where the variable is declared in the program.
• For  example,  a  variable  is  declared  in  ―if‖  block,  is  available  only  within  the  "if"  block itself.
• To have a better idea on this, we discuss about all available scopes in C#.

Strong  Rule  to  follow:    

     Multiple  variables  with  same  name  within  the  same  scope can‘t be declared anywhere.

Operators

C# supports different kinds of operators.

• Assignment operator

                  =

• Arithmetical / Mathematical operators

            +, -, *, /, %

• Self Assignment operators

           +=, -=, *=, /=

•  Prefix and Postfix operators

            ++, --

• Relational operators

           ==, !=, <, >, <=, >=

• Logical operators

           &&, ||, !

• Comment operators

            //xxxxxxxxxxxxxx
             (or)
            /* xxxxxxxxxxx
            xxxxxxxxxxx
            xxxxxxxxxxx*/

• Concatenation Operator

            +

• Block specification operators

           { }

• Method specification operators

           ( )

• Conditional operator

          ? :

• Dynamic memory allocation operator

            new

Operator Procedence