/*Illustrate the use of dereferencing operators to access the class
members through pointers. To implement this, define a class M
with x and y as data members. Define two methods. One is to input
the values of x and y and other to find the sum. The sum is a friend
function and object of class M is passed as argument in sum.
Sum will access the class members through dereferencing operators.
Implement the program and display the results in a neat format
*/
#include<iostream.h>
#include<conio.h>
class M
{
int x,y;
public:
void getdata(void){cout<<"Enter X : ";cin>>x;
cout<<"Enter Y : ";cin>>y;}
friend void sum(M);
};
void sum(M m)
{
M *pm = &m;
int M:: *px = &M::x;
int M:: *py = &M::y;
cout<<endl<<"The sum = "<<pm->*px+pm->*py;
}
void main()
{
clrscr();
M om;
om.getdata();
sum(om);
getch();
}
Alternate
#include<iostream.h>
#include<conio.h>
class M
{
int x,y;
public:
void getdata(void){cout<<"Enter X : ";cin>>x;
cout<<"Enter Y : ";cin>>y;}
friend void sum(M);
};
void sum(M m)
{
int M:: *px = &M::x;
int M:: *py = &M::y;
cout<<endl<<"The sum = "<<m.*px+m.*py;
}
void main()
{
clrscr();
M om;
om.getdata();
sum(om);
getch();
}
