C++ program to calculate factorial of a number using copy constructor

#include <iostream>
#include<string>
using namespace std;
class copy
{
int n,i,fact;
public:
copy(int x)
{
n=x;
fact=1;
}
copy(copy &x)
{
x=x.n;
fact=1;
}
void calculate()
{
for(i=1;i<=n;i++)
{
fact=fact*i;
}
}
void display()
{
cout<<"\nFactorial.."<<fact<<endl;
}

};
int main()
{
int x;
cout<<"\nEnter value..";
cin>>x;
copy c1(x);
copy c2(c1);
c2.calculate();
c2.display();
return 0;
}