ex9_10.cpp

Visual C++ 2005的源代码

// Ex9_10.cpp
// Using an abstract class
#include "Box.h"                       // For CBox and CContainer
#include "Can.h"                       // For CCan (and CContainer)
#include <iostream>                    // For stream I/O
using std::cout;
using std::endl;

const double PI= 3.14159265;           // Global definition for PI

int main(void)
{
  // Pointer to abstract base class
  // initialized with address of CBox object
  CContainer* pC1 = new CBox(2.0, 3.0, 4.0);

  // Pointer to abstract base class
  // initialized with address of CCan object
  CContainer* pC2 = new CCan(6.5, 3.0);

  pC1->ShowVolume();                   // Output the volumes of the two
  pC2->ShowVolume();                   // objects pointed to
  cout << endl;

  delete pC1;                          // Now clean up the free store
  delete pC2;                          // ....

  return 0;
}