// by Ira Pohl

//
//ADT POINT (x,y) pair
#include <iostream.h>
#include <assert.h> class point {
public:
   point(): x(0), y(0){} //default constructor
   //special importance is with arrays
   //
   //ADT POINT (x,y) pair
   point(unsigned short a): x(a), y(0){} //conversion constructor
   point(unsigned short a, unsigned short b): x(a), y(b){}
   //initialization -primary use for constructor
   point(const point& p):x(p.x), y(p.y){} //copy constructor
   //special importance call by value and return mechanism

   ~point()//note void signature always
   { cerr << " point out of scope " << x << " , " << y << endl; }

private:
   //implementation
   unsigned short x, y; //x and y will be 0 - 1000
};

class color_point : public point {
public:
   color_point():point(), color(black){}
private:
   enum spectrum{black, green, blue, red} color;
};

main()
{
   point p1, p2(9), p3(p2);

}