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

class demo {

int fx;

public :

void input(int x) {

fx=x;
}

friend int findsqr(demo);

};

int findsqr(demo d) {

return d.fx*d.fx;

}


void main() {

demo f;
f.input(30);
cout<<"square of number is ="<<findsqr(f);
getch();
}