01.using System;
02.
03. public class Circle
04. {
05. private string color;
06. private double radius;
07. private const double PL = 3.14;
08. public void Main()
09. {
10.
11.
12. string y;
13. int num1;
14. do
15. {
16. Console.WriteLine("==============================");
17. Console.WriteLine("1.\t Radius");
18. Console.WriteLine("2.\t Diameter");
19. Console.WriteLine("==============================");
20. Console.Write("Please, choose the menu choice: ");
21. num1 = int.Parse(Console.ReadLine());
22. if (num1 == 1)
23. {
24. Console.Write("Please, key radius: ");
25. radius = double.Parse(Console.ReadLine());
26.
27. Circle aa = new Circle();
28. aa.surface();
29. Circle bb = new Circle();
30. bb.volume();
31.
32.
33.
34. }
35. else if (num1 == 2)
36. {
37. Console.Write("Please, key Diameter: ");
38. radius = double.Parse(Console.ReadLine());
39.
40.
41. }
42. else
43. {
44. Console.Write("Invalid It cannot na ja");
45. }
46. Console.Write("Do you want to play again <Y/N>?: ");
47. y = Console.ReadLine();
48. } while (y == "y" || y == "Y" && y != "n" && y != "N");
49. }
50.
51. public Circle(double radius)
52. {
53. this.radius = 1;
54. this.color = "White";
55.
56. }
57. public Circle(double radius, string color)
58. {
59. this.radius = 1;
60. this.color = "White";
61. }
62.
63. public double surface()
64. {
65. double surface = 4 * PL * Math.Pow(radius, 2);
66. return surface;
67. Console.WriteLine("Circle has surface : {0}", surface);
68.
69. }
70. public double volume()
71. {
72. double volume = (3 / 4) * PL * Math.Pow(radius, 3);
73. return volume;
74. Console.WriteLine("Circle has volume : {0}", volume);
75. }
76. }
