//p.cpp -- demo polymorphism
#include <iostream>
using namespace std;
class Shape {
   public:
   virtual   // comment out this line and test again ?
    void draw( ) { cout << "aaa "; }
}; // Shape
class Line: public Shape {
   public: void draw( ) { cout << "LLL "; }
};
struct Circle: public Shape {  // struct{  === class { public:
   void draw( ) { cout << "ccc "; }
};
int main( ) {
   Shape * p;
  p = new Shape( );  p->draw( );
  p = new Line( );  p->draw( );
  p = new Circle( );  p->draw( );
  cout << endl;
}
/*****
11:05am ccbsd2:polymorphish/> g++ p.cpp
11:05am ccbsd2:polymorphish/> ./a.out
aaa LLL ccc
11:05am ccbsd2:polymorphish/>
11:05am ccbsd2:polymorphish/>
*****/