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  1. #include <string>
  2. #include <cmath>
  3. #include <vector>
  4. #include <iostream>
  5.  
  6. class Shape {
  7. public:
  8.   Shape(const std::string name): _name(name) { ; }
  9.  
  10.   std::string name() const { return _name; }
  11.  
  12.   virtual double area() const = 0;
  13.  
  14. private:
  15.   const std::string _name;
  16. };
  17.  
  18. class Circle : public Shape {
  19. public:
  20.   Circle(double r): Shape("Circle"), _r(r) { ; }
  21.  
  22.   double area() const override {
  23.     return M_PI * _r * _r;
  24.   }
  25.  
  26. private:
  27.   const double _r;
  28. };
  29.  
  30. std::ostream& operator<<(std::ostream& out, const Shape& s) {
  31.   return out << "Nazwa: " << s.name() << ", pole: " << s.area();
  32. }
  33.  
  34. int main() {
  35.   std::vector<Shape*> shapes = { new Circle(12.5), new Circle(18.5) };
  36.   for(unsigned i = 0; i < shapes.size(); ++i) {
  37.     std::cout << *shapes[i] << "\n";
  38.   }
  39.  
  40.   for(unsigned i = 0; i < shapes.size(); ++i) {
  41.     delete shapes[i];
  42.   }
  43.   return 0;
  44. }
  45.  
Success #stdin #stdout 0s 3232KB
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Standard input is empty
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Nazwa: Circle, pole: 490.874
Nazwa: Circle, pole: 1075.21
https://ideone.com/9ydFVv
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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