C++: Referencing class members

Referencing class members

The members of a class are referenced (accessed) by using the object of the class followed by the dot (membership) operator and the name of the member.

The general syntax for calling the member function is:

Object_name . function_name(actual parameter);

For example consider the following illustration

Illustration 14.4 C++ program to illustrate the communication of object:

Calling a member function of an object is also known as sending message to object or  communication  with  the object.

#include<iostream>

using namespace std; 

class compute

{   

       int n1,n2; //private by default

public :

      int n;  

      int add (int a, int b)   //inline member function

       {

      int c=a+b; //int c ; local variable for this function

      return c;

       }

       int prd (int a, int b) //inline member function

      {

      int c=a*b;

      return c;

      }          

};   // end of class specification        

compute c1,c2;     //global object      

int main()

{

      c1.n =c1.add(12,15);  //member function is called

      c2.n =c2.add(8,4);

      cout<<"\n Sum of object-1 "<<c1.n;

      cout<<"\n Sum of object-2 "<<c2.n;

      cout<<"\n Sum of the two objects are "<<c1.n+c2.n;

      c1.n=c1.prd(5,4);

      c2.n=c2.prd(2,5);

      cout<<"\n Product of object-1 "<<c1.n;

      cout<<"\n Product of object-2 "<<c2.n;

      cout<<"\n Product of the two objects are "<<c1.n*c2.n;

      return 0;

}

Output:

Sum of object-1 27

Sum of object-2 12

Sum of the two objects are 39

Product of object-1 20

Product of object-2 10

Product of the two objects are 200