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  1. #include <iostream> 
  2.  
  3. using namespace std; 
  4.  
  5.  
  6.  
  7. class Circle { 
  8.  
  9.     // private data member 
  10.  
  11. private: 
  12.  
  13.     double radius; 
  14.  
  15.  
  16.  
  17.     // public member function 
  18.  
  19. public: 
  20.  
  21.     void compute_area(double r) 
  22.  
  23.     { 
  24.  
  25.         // member function can access private 
  26.  
  27.         // data member radius 
  28.  
  29.         radius = r; 
  30.  
  31.  
  32.  
  33.         double area = 3.14 * radius * radius; 
  34.  
  35.  
  36.  
  37.         cout << "Radius is: " << radius << endl; 
  38.  
  39.         cout << "Area is: " << area; 
  40.  
  41.     } 
  42. }; 
  43.  
  44.  
  45. // main function 
  46.  
  47. int main() 
  48. { 
  49.  
  50.     // creating object of the class 
  51.  
  52.     Circle obj; 
  53.  
  54.  
  55.  
  56.     // trying to access private data member 
  57.  
  58.     // directly outside the class 
  59.  
  60.     obj.compute_area(1.5); 
  61.  
  62.  
  63.  
  64.     return 0; 
  65. }
Success #stdin #stdout 0.01s 5396KB
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stdin
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Standard input is empty
stdout
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Radius is: 1.5
Area is: 7.065
https://ideone.com/jOzUDZ
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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