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  1. #include<iostream>
  2.  
  3.  using namespace std;
  4.  
  5.  class Circle
  6.  {
  7. private:
  8.     const double PI = 3.14159;  // added const since PI is a constant
  9.     double radius;
  10.  
  11. public:
  12.     Circle()                 // do you really want to construct a circle of radius 0? Your choice. You could remove this constructor if you want
  13.     {
  14.         radius = 0.0;
  15.     }
  16.  
  17.     Circle(double r)
  18.     {
  19.         radius = r;
  20.     }
  21.  
  22.     void setRadius(double r)
  23.     {
  24.         radius = r;
  25.     }
  26.  
  27.     double getRadius()
  28.     {
  29.         return radius;
  30.     }
  31.  
  32.     double getArea()
  33.     {
  34.         return PI * radius * radius;
  35.     }
  36.  
  37.     double getDiameter()
  38.     {
  39.         return radius * 2;
  40.     }
  41.  
  42.     double getCircumference()
  43.     {
  44.         return 2 * PI * radius;
  45.     }
  46.  };
  47.  
  48.  
  49. int main()
  50.  {
  51.      double radius;
  52.  
  53.      cout << "Enter the circle's radius:" << endl;
  54.      cin >> radius;
  55.  
  56.      Circle c(radius);
  57.  
  58.      cout << "Radius:" << c.getRadius() << endl;
  59.  
  60.      cout << "Area:" << c.getArea() << endl;
  61.  
  62.      cout << "Diameter:" << c.getDiameter() << endl;
  63.  
  64.      cout << "Circumference:" << c.getCircumference() << endl;
  65.  
  66.      return 0;
  67.  }
Success #stdin #stdout 0s 15240KB
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stdin
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10
stdout
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Enter the circle's radius:
Radius:10
Area:314.159
Diameter:20
Circumference:62.8318
https://ideone.com/v2KpQO
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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