Functions in C++

§ Function is a block of code performing a unit task.

§ Function has a name, return type and arguments.

§ Function is a way to achieve modularization.

§ Function are Predefined and user defined.

§ Predefined functions are declared in header files and defined in library files.

Function Definition, Declaration and Call

Declaration

  § Function declaration is also known as function prototype.

  § Functions need to be declared before use. (Just like variable).

  § Functions can be declared locally or globally.

  § Return_type function_name(arguments);

  § Function definition is a block of code.

  Ways to define a function?

  § Takes Nothing, Return Nothing

  § Takes something, Return Nothing

  § Takes Nothing, Returns Something

  § Takes Something, Return Something

     Formal and Actual Arguments

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