Implementation of Unary operator overloading using friend function.

#include<iostream.h>
#include<conio.h>

class point
{
private:
int x,y;
public:
point(int i,int j)
{
x=i;
y=j;
}

void show()
{
cout<<"point="<<"("<<x<<","<<y<<")"<<endl;
}

friend void operator++(point &p1);

};

void operator++(point &p1)
{
p1.x++;
p1.y++;
}

void main()
{
clrscr();
point p1(2,2);
p1.show();
cout<<"after increment"<<endl;
++p1;
p1.show();
getch();
}


//for any errors pls comment......