C++ MCQs - Friend Function

This section focuses on the "Friend Function" in C++ programming langauge. These Multiple Choice Questions (MCQ) should be practiced to improve the C++ programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. A friend class can access ____________________ members of other class in which it is declared as friend.

A. private
B. protected
C. public
D. Both A and B

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2. A friend function can be

A. A method of another class
B. A global function
C. Both A and B
D. None of the above

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3. If class A is a friend of B, then B doesn’t become a friend of A automatically.

A. TRUE
B. FALSE
C. Can be true and false
D. Can not say

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4. Which of the following is false?

A. Friendship is not inherited
B. The concept of friends is there in Java.
C. Both A and B
D. None of the above

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5. What will be output for the followiing code?

#include <iostream>
class A { 
private: 
    int a; 
  
public: 
    A() { a = 0; } 
    friend class B; // Friend Class 
}; 
  
class B { 
private: 
    int b; 
  
public: 
    void showA(A& x) 
    { 
         
        std::cout << ""A::a="" << x.a; 
    } 
}; 
  
int main() 
{ 
    A a; 
    B b; 
    b.showA(a); 
  
 }

A. A::a=0
B. A
C. a=0
D. A::0

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6. What will be output for the following code?

class Box
{
 int capacity;
   public:
 void print();
 friend void show();
 bool compare();
 friend bool lost();
};

A. 1
B. 2
C. 3
D. 4

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7. Which keyword is used to represent a friend function?

A. friend
B. Friend
C. friend_func
D. Friend_func

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8. Which of the following is correct about friend functions?

A. Friend functions use the dot operator to access members of a class using class objects
B. Friend functions can be private or public
C. Friend cannot access the members of the class directly
D. All of the above

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9. Pick the correct statement.

A. Friend functions are in the scope of a class
B. Friend functions can be called using class objects
C. Friend functions can be invoked as a normal function
D. Friend functions can access only protected members not the private members

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10. Where does keyword ‘friend’ should be placed?

A. function declaration
B. function definition
C. main function
D. block function

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