/// File shapetest.cc, by KWR for CSE250 S'00.  Test code for Java2C++ handout.
/// To keep this example small, I put all classes and main() in one file.

#include <iostream>
#include <string>

class Shape {};

class ClosedCurve: public Shape {
public:
   virtual double area() const = 0;  ///doesn't say the area is always zero :-)
};

class Rectangle: public ClosedCurve {
   double length, width;             ///not pointers since primitive types.
public:
   Rectangle(int ell, int w): length(ell), width(w) {}
   virtual double area() const { return length*width; }
}; ///Note ^^^^^^ implicit conversion ^^^^^^ going on here!

int main() {
   Rectangle* rp = new Rectangle(3.0,4.0);
   Rectangle r(5.0,7.0);
   string str = "abcde";
   cout << str << rp->area() << r.area() << endl;
}

/// Note: Delete the "()" from either occurrence of "area" and see how many
/// error messages you get!!!
/// Then try deleting either "const", and see what message(s) you get.
/// Also see what happens if you delete ";" after closing class braces.