// File: ex5-1.cpp

#include <iostream>
using namespace std;

class Thing
{
  private:
	 int x;
	 double y;
  public:
	 Thing(int arg1 = 0, double arg2 = 0.0);	 	// constructor
	 void copyThing(Thing&);
	 void printThing(void) { cout << x << ' ' << y << endl; }
};

Thing::Thing(int arg1, double arg2) : x(arg1), y(arg2)
{ }

void Thing::copyThing(Thing& z)
{
  if (this == &z)
  {
	 cout << "Don't copy me to myself\n";
	 return;
  }
  x = z.x;
  y = z.y;
}

int main(void)
{
  Thing a(5,3.14);
  Thing b(1);
  Thing c;
  a.printThing();
  b.printThing();
  c.printThing();
  c.copyThing(a);	// copy Thing-a to c
  c.printThing();
  b.copyThing(b);	// copy Thing-b to b
  b.printThing();
}