helps.cpp

#include <iostream>
using namespace std;

class object_c {

public:
	int			x,
				y;

	object_c(int X, int Y) : x (X), y (Y){}
};

class calc_c {
private:
	object_c	*ship,
				*targ,
				*ref;

public:
	int			pos2			(object_c A, object_c B) {
		return (A.x-B.x)*(A.x-B.x);
	}
	int			ship_pos		(object_c A){return pos2(*ship, A);}	//these
	int			ship_targ_pos	()			{return pos2(*ship, *targ);}//should be
	int			ship_ref_pos	()			{return pos2(*ship, *ref);} //replaced

	void		set_ship		(object_c *A){ship = A;}
	void		set_targ		(object_c *A){targ = A;}
	void		set_ref			(object_c *A){ref = A;}
} calc;

int main() {

	object_c Ship(0,1), Targ(10,11), Ref(20,21);	//notice capitalization

	calc.set_ship(&Ship);
	calc.set_targ(&Targ);
	calc.set_ref (&Ref);

	cout << calc.pos2			(Ship, Targ)<< endl;//should
	cout << calc.ship_pos		(Targ) 		<< endl;//be
	cout << calc.ship_targ_pos	()			<< endl;//identical

	return 0;
}