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  1. #include <iostream>                                                                                                                                                                                                                                                               
  2. #include <string>
  3. using namespace std;
  4. //class Engine
  5.  
  6. class Car;
  7. class Engine
  8. {
  9.     private:
  10.         int CC_;
  11.         string type_;
  12.         int weight_;
  13.         friend void check_engine(Car&);
  14.         friend class Car;
  15.         friend void check_my_engine(void);
  16.  
  17.     public:
  18.         //Engine constructor
  19.         Engine(int c, string t, int w)
  20.             : CC_(c)
  21.             , type_(t)
  22.             , weight_(w)
  23.         {
  24.             cout << "Engine!" << '\t'
  25.                  << "CC: " << c << '\t' 
  26.                  << "Type: " << t << '\t' 
  27.                  << "Weight: " << w << '\n';
  28.         }
  29.  
  30.         //Engine destructor
  31.         ~Engine()
  32.         {
  33.             cout << "Engine destructor!" << endl;
  34.         }
  35. };
  36.  
  37. //class Car - Inheritance class Engine
  38. class Car
  39. {
  40.     private:
  41.         Engine my_engine;   
  42.         friend void check_engine(Car&);
  43.  
  44.     public:
  45.         //Car constructor
  46.         Car(int c, string t, int w)
  47.             : my_engine(c, t, w)
  48.         {
  49.             cout << "Car!" << '\t'
  50.                  << "CC: " << c << '\t'
  51.                  << "Type: " << t << '\t'
  52.                  << "Weight: " << w << endl;
  53.         }
  54.  
  55.         //function-check_my_engine
  56.         void check_my_engine(void)
  57.         {
  58.             cout << "Check my engine!" << '\t';
  59.             cout << "CC: " << my_engine.CC_ << '\t'
  60.                  << "Type: " << my_engine.type_ << '\t'
  61.                  << "Weight: " << my_engine.weight_ << endl;
  62.         }
  63.                 //Car destructor
  64.         ~Car()
  65.         {
  66.             cout << "Car destructor!" << endl;
  67.         }
  68. };
  69.  
  70. //function-check_engine 
  71. void check_engine(Car& bu)
  72. {
  73.     cout << "Check engine!" << '\t'; 
  74.     cout << "CC: " << bu.my_engine.CC_ << '\t'
  75.          << "Type: " << bu.my_engine.type_ << '\t'
  76.          << "Weight: " << bu.my_engine.weight_ << endl;
  77. }
  78.  
  79. int main()
  80. {
  81.     Car car(99, "wow", 99);
  82.  
  83.     check_engine(car);
  84.  
  85.     check_my_engine(void);  
  86.  
  87.     return 0;   
  88. }
  89.  
  90.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp: In function 'int main()':
prog.cpp:85:21: error: expected primary-expression before 'void'
     check_my_engine(void);  
                     ^
prog.cpp:85:25: error: 'check_my_engine' was not declared in this scope
     check_my_engine(void);  
                         ^
stdout
copy 
Standard output is empty
https://ideone.com/3ZYMNl
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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