Write a program to demonstrate the use of this pointer

#include<iostream.h>
#include<conio.h>
class compare
{
int n;
public:
compare()
{
n=0;
}
compare(int a)
{
n=a;
}
compare check(compare c)
{
if(n>c.n)
return *this;
else
return c;
}
void display()
{
cout<<n;
}
};
void main()
{

int o1,o2;
clrscr();
cout<<"Enter number for object1:";
cin>>o1;
cout<<"Enter number for object2:";
cin>>o2;
compare c1(o1),c2(o2),c3;
c3=c1.check(c2);
cout<<"Largest number is:";
c3.display();
getch();

}