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  1. #include <iostream>
  2. #include <vector>
  3. #include <memory>
  4. #include <math.h>
  5.  
  6. using namespace std;
  7.  
  8. class Shape {
  9.     float x, y;
  10. public:
  11.     virtual float area() = 0;
  12. };
  13.  
  14. class Circle : public Shape {
  15.     float radius;
  16. public:
  17.     Circle(float radius) : radius{radius} { }
  18.  
  19.     virtual float area() {
  20.       return M_PI * radius * radius;
  21.     }
  22. };
  23.  
  24. class Rect : public Shape {
  25.     float width;
  26.     float height;
  27. public:
  28. 	Rect(float width, float height) : width{width}, height{height} { }
  29.  
  30.     virtual float area() {
  31.       return width * height;
  32.     }
  33. };
  34.  
  35. int main()
  36. {
  37.    vector<unique_ptr<Shape>> shapes;
  38.  
  39.    shapes.push_back(make_unique<Circle>(5));
  40.    shapes.push_back(make_unique<Rect>(4,6));
  41.  
  42.    float total_area = 0;
  43.    for(auto&& shape: shapes) {
  44.    	total_area += shape->area();
  45.    }
  46.    cout << "Total area is " << total_area << endl;
  47.  
  48.    return 0;
  49. }
Success #stdin #stdout 0s 4360KB
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stdin
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Standard input is empty
stdout
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Total area is 102.54
https://ideone.com/7uRPD5
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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