jia.cpp

it is a usefull thing

#include<iostream.h>
class sample
{
//	int n;
public:
	int n;
	sample(){}
	   sample(int i){n=i;}
	   sample square(sample){}
	   void display(){cout<<"n="<<n<<endl;}

private:
};
sample square(sample x)
{
 this -> n=x.n*x.n;
return (*this);
}
void main()
{
sample a(5),b;
a.display();
b=square(a);
b.display();
}