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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. 	void setDim(double i, double j){
  10. 		x=i;
  11. 		y=j;
  12. 	}
  13. 	virtual void showArea() = 0;
  14. 	virtual void showPerimeter() = 0;
  15. };
  16.  
  17. class Triangle: public Figure{
  18. 	public:
  19. 	void showArea(){
  20. 		cout << "Triangle area: " << 0.5 *x*y<< endl;
  21. 	}
  22. 	void showPerimeter(){
  23. 		double z = sqrt(x*x + y*y);
  24. 		cout << "Triangle perimeter: " << x+y+z << endl;
  25. 	}
  26. };
  27.  
  28. class Rectangle: public Figure{
  29. 	public:
  30. 	void showArea(){
  31. 		cout << "Rectangle area: " << x*y<< endl;
  32. 	}
  33. 	void showPerimeter(){
  34. 		cout << "Rectangle perimeter: " << 2*(x+y) << endl;
  35. 	}
  36. };
  37.  
  38. class Circle: public Figure{
  39. 	public:
  40. 	void showArea(){
  41. 		cout << "Circle area: " << 3.14 *x*y<< endl;
  42. 	}
  43. 	void showPerimeter(){
  44. 		cout << "Circle perimeter: " << 2* 3.14 * x << endl;
  45. 	}
  46. };
  47. int main() {
  48. 	Figure *pFigure;
  49. 	Triangle triangle;
  50. 	Rectangle rectangle;
  51. 	Circle circle;
  52.  
  53. 	pFigure = &triangle;
  54. 	pFigure->setDim(10.0, 5.0);
  55. 	pFigure->showArea();
  56. 	pFigure->showPerimeter();
  57.  
  58. 	pFigure = &rectangle;
  59. 	pFigure->setDim(10.0, 5.0);
  60. 	pFigure->showArea();
  61. 	pFigure->showPerimeter();
  62.  
  63. 	pFigure = &circle;
  64. 	pFigure->setDim(5.0);
  65. 	pFigure->showArea();
  66. 	pFigure->showPerimeter();
  67. 	return 0;
  68. }
Success #stdin #stdout 0s 5320KB
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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: 157
Circle perimeter: 62.8
https://ideone.com/LIdsyi
language:
C++ (gcc 8.3)
created:
16 hours ago
visibility:
public

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