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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. // *****************************************************************************
  5.  
  6. class Figure {
  7.   public:
  8.     virtual double Area() = 0;
  9.     void PrintName() {
  10.       std::cout << "Фигура = " << Name() << " ";
  11.     }
  12.   private:
  13.     virtual std::string Name() = 0;
  14. };
  15.  
  16. // *****************************************************************************
  17.  
  18. class Rectangle: public Figure {
  19.   public:
  20.     explicit Rectangle(double h, double w): H(h), W(w) {}
  21.     double Area() override {
  22.       return H*W;    	
  23.     }
  24.   private:
  25.     double H,W;
  26.     std::string Name() override {
  27.       return "Прямоугольник";
  28.     }
  29. };
  30.  
  31. // *****************************************************************************
  32.  
  33. class Square: public Rectangle {
  34.   public:
  35.     explicit Square(double l): Rectangle (l,l) {}
  36.   private:
  37.     std::string Name() override {
  38.       return "Квадрат";
  39.     }
  40. };
  41.  
  42. // *****************************************************************************
  43.  
  44. class Ellipse: public Rectangle {
  45.   public:
  46.     explicit Ellipse(double a, double b): Rectangle (a,b) {}
  47.     double Area() override {
  48.       return Rectangle::Area()*3.1415;    	
  49.     }
  50.   private:
  51.     std::string Name() override {
  52.       return "Эллипс";
  53.     }
  54. };
  55.  
  56. // *****************************************************************************
  57.  
  58. int main() {
  59.   std::vector<Figure*> V;
  60.   V.push_back(new Rectangle(2,3));
  61.   V.push_back(new Square(4));
  62.   V.push_back(new Ellipse(2,3));
  63.   for(const auto &i:V) {
  64.     i->PrintName();
  65.     std::cout << ", площадь: " << i->Area() << std::endl;
  66.     delete i;
  67.   }
  68.   return 0;
  69. }
Success #stdin #stdout 0s 4504KB
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stdin
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Standard input is empty
stdout
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Фигура = Прямоугольник , площадь: 6
Фигура = Квадрат , площадь: 16
Фигура = Эллипс , площадь: 18.849
https://ideone.com/4pxz4m
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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