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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4. //4.1. 
  5. class Figure{
  6. 	protected:
  7. 	double x, y;
  8. 	public:
  9. 	//4.2.
  10. 	static int count;
  11. 	void setDim(double i, double j){
  12. 		x=i;
  13. 		y=j;
  14. 	}
  15. 	virtual void showArea() = 0;
  16. 	virtual void showPerimeter() = 0;
  17. };
  18.  
  19. //4.2.
  20. int Figure::count = 0;
  21.  
  22. class Triangle: public Figure{
  23. 	public:
  24. 	void showArea(){
  25. 		cout << "Triangle area: " << 0.5 *x*y<< endl;
  26. 	}
  27. 	void showPerimeter(){
  28. 		double z = sqrt(x*x + y*y);
  29. 		cout << "Triangle perimeter: " << x+y+z << endl;
  30. 	}
  31. };
  32.  
  33. class Rectangle: public Figure{
  34. 	public:
  35. 	void showArea(){
  36. 		cout << "Rectangle area: " << x*y<< endl;
  37. 	}
  38. 	void showPerimeter(){
  39. 		cout << "Rectangle perimeter: " << 2*(x+y) << endl;
  40. 	}
  41. };
  42.  
  43. class Circle: public Figure{
  44. 	public:
  45. 	void showArea(){
  46. 		cout << "Circle area: " << 3.14 *x*y<< endl;
  47. 	}
  48. 	void showPerimeter(){
  49. 		cout << "Circle perimeter: " << 2* 3.14 * x << endl;
  50. 	}
  51. };
  52. int main() {
  53. 	Figure *pFigure;
  54. 	Triangle triangle;
  55. 	Rectangle rectangle;
  56. 	Circle circle;
  57.  
  58. 	pFigure = &triangle;
  59. 	pFigure->setDim(10.0, 5.0);
  60. 	pFigure->showArea();
  61. 	pFigure->showPerimeter();
  62.  
  63. 	pFigure = &rectangle;
  64. 	pFigure->setDim(10.0, 5.0);
  65. 	pFigure->showArea();
  66. 	pFigure->showPerimeter();
  67.  
  68. 	pFigure = &circle;
  69. 	pFigure->setDim(5.0, 11.0);
  70. 	pFigure->showArea();
  71. 	pFigure->showPerimeter();
  72. 	return 0;
  73. }
Success #stdin #stdout 0.01s 5316KB
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stdin
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Standard input is empty
stdout
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Triangle area: 25
Triangle perimeter: 26.1803
Rectangle area: 50
Rectangle perimeter: 30
Circle area: 172.7
Circle perimeter: 31.4
https://ideone.com/2aGZwT
language:
C++ (gcc 8.3)
created:
16 hours ago
visibility:
public

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