Function main

Examples/Modules/Chapter 15/Ex15_03/Ex15_03.cpp:5–30

import boxes;

int main()
{
  Box box {20.0, 30.0, 40.0};
  ToughPack hardcase {20.0, 30.0, 40.0};         // A derived box - same size
  Carton carton {20.0, 30.0, 40.0, "Plastic"};   // A different derived box

  box.showVolume();          // Volume of Box
  hardcase.showVolume();     // Volume of ToughPack
  carton.showVolume();       // Volume of Carton

// Uncomment the following statement for an error
// std::cout << "\nhardcase volume is " << hardcase.volume() << std::endl;

  // Now using a base pointer...
  Box* base {&box};          // Points to type Box
  std::cout << "\nbox volume through base pointer is " << base->volume() << std::endl;
  base->showVolume();

  base = &hardcase;          // Points to type ToughPack
  std::cout << "hardcase volume through base pointer is " << base->volume() << std::endl;
  base->showVolume();

  base = &carton;                // Points to type Carton
  std::cout << "carton volume through base pointer is " << base->volume() << std::endl;
  base->showVolume();
}