Operations or Methods

Introduction to Operations or Methods

As  we have  seen in the last section that an  object encapsulates data and  the algorithm that process the data. These algorithms  are called  operations  or methods and can be viewed as modules in conventional sense. Each  of the  method that  is encapsulated by  an object provides a representation  of  one of the behaviours of the object. Whenever an object receives stimulus it initials some behaviour.

The methods of an object  define  how the object behaves in the system. Methods  may  or may not  contain parameters for their execution. In the objects oriented programming  language the  presence and working  of methods may be explained by the following  examples of C++.

Class student {                                          // the student class

Char name;

Int age;

Int /;

Void input ( )

{

Count << enter the student name age and ID"

Cin>> name  age > l;

}

Void display ( )

{

                                                Count << NAME , AGE  ID;

                                                Count << / << name  << /t <<age /<<l;

                                                }}

                        Void main ( )

                        Student S;

//creating  objects of class student and calling its methods

                        S.input( );

                        s.display();

                                    }

                        For example  input data are Rahall 20 and 815 then the output will be:

 

                        NAME                        AGE                            ID

                        Rahul                                     20                               815

                        In the  same manner methods are used in  objects oriented analysis design and  modelling. The methods of the objects will determine and may  change the values contained  by the  objects.

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