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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. using namespace std;
  5.  
  6. const float PI = 3.14;
  7.  
  8. class DuongTron
  9. {
  10. private:
  11. 	int x, y;
  12. 	float r;
  13. public:
  14. 	DuongTron();
  15. 	DuongTron(int toaDoX, int toaDoY, float banKinh);
  16. 	void nhap();
  17. 	void xuat();
  18. 	double dienTich();
  19. 	double chuVi();
  20. 	~DuongTron();
  21. };
  22.  
  23. DuongTron::DuongTron() : x(0), y(0), r(1) {}
  24.  
  25. DuongTron::DuongTron(int toaDoX, int toaDoY, float banKinh) 
  26. 	: x(toaDoX), y(toaDoY), r(banKinh) {}
  27.  
  28. void DuongTron::nhap()
  29. {
  30. 	cout << "Nhap toa do x: "; 
  31. 	cin >> x;
  32. 	cout << "Nhap toa do y: ";
  33. 	cin >> y;
  34. 	cout << "Nhap ban kinh r: ";
  35. 	cin >> r;
  36. }
  37.  
  38. void DuongTron::xuat()
  39. {
  40. 	cout << "Chu vi: " << chuVi() << endl;
  41. 	cout << "Dien tich: " << dienTich() << endl;
  42. }
  43.  
  44. double DuongTron::dienTich()
  45. {
  46. 	return PI * r * r;
  47. }
  48.  
  49. double DuongTron::chuVi()
  50. {
  51. 	return 2 * PI * r;
  52. }
  53.  
  54. DuongTron::~DuongTron()
  55. {
  56.  
  57. }
  58.  
  59. int main()
  60. {
  61. 	DuongTron a;
  62. 	a.nhap();
  63. 	a.xuat();
  64.  
  65. 	return 0;
  66. }
Success #stdin #stdout 0s 5284KB
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stdin
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Standard input is empty
stdout
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Nhap toa do x: Nhap toa do y: Nhap ban kinh r: Chu vi: 6.28
Dien tich: 3.14
https://ideone.com/EaSU38
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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