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  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. class City;
  6. class Customer;
  7.  
  8. class Customer {
  9.     friend void displayInfo(Customer, City);
  10. private:
  11.     int custNum;
  12.     int zipCode;
  13. };
  14.  
  15. class City {
  16.     friend void displayInfo(Customer, City);
  17.     string cityName;
  18.     int zipCode;
  19. };
  20.  
  21. void displayInfo(Customer cus, City city) {
  22.     cout << cus.custNum; //compiler error - Inaccessible 
  23. }
  24.  
  25. int main(){
  26. 	return 0;
  27. }
Success #stdin #stdout 0s 3452KB
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stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/fyQ7Ll
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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