MPSTME: Friend Function (easy)

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


class square
{
int x;
public:
void set_value(int b)
{x=b; }
friend void find_square(square);
};


void find_square(square a)
{
  cout<<a.x*a.x<<endl ;
}
void main()
{
square s;
clrscr();
s.set_value(5);
find_square(s);
getch();
}