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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class Shape {
  5. public:
  6.     virtual double area() = 0;
  7.     virtual ~Shape() {}
  8. };
  9.  
  10. class Circle : public Shape {
  11.     double r;
  12. public:
  13.     Circle(double radius) : r(radius) {}
  14.     double area() { return 3.14 * r * r; }
  15. };
  16.  
  17. class Rectangle : public Shape {
  18.     double w, h;
  19. public:
  20.     Rectangle(double width, double height) : w(width), h(height) {}
  21.     double area() { return w * h; }
  22. };
  23.  
  24. class Triangle : public Shape {
  25.     double b, h;
  26. public:
  27.     Triangle(double base, double height) : b(base), h(height) {}
  28.     double area() { return 0.5 * b * h; }
  29. };
  30.  
  31. void printArea(Shape* shape) {
  32.     cout << shape->area() << endl;
  33. }
  34.  
  35. int main() {
  36.     Circle c(5);
  37.     Rectangle r(4, 6);
  38.     Triangle t(3, 4);
  39.  
  40.     printArea(&c);
  41.     printArea(&r);
  42.     printArea(&t);
  43.  
  44.     return 0;
  45. }
Success #stdin #stdout 0.01s 5324KB
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Standard input is empty
stdout 
78.5
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6
https://ideone.com/Ycz3Xv
language:
C++14 (clang 8.0)
created:
2 days ago
visibility:
public

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