C++ Program to Swap Two Numbers using Friend Function

#include<iostream.h>
#include<conio.h>
using namespace std;
class temp
{
int x, y, q;
public:
void input()
{
cout << "Enter Two Numbers:"; cin >> x>>y;
}
friend void swap(temp &t);
void display()
{
cout << "After Swap x is:" << x;
cout << "After Swap y is:" << y;
}
};
void swap(temp &t)
{
t.q = t.x;
t.x = t.y;
t.y = t.q;
}
int main()
{
temp t1;
t1.input();
swap(t1);
t1.display();
return 0;
}