Function main

Examples/Modules/Chapter 15/Ex15_04/Ex15_04.cpp:5–29

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

  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();
}