Overloading In C++ Mcq Exercise 1

1. What is the motive for overloading the subscript operator in a class?

• ✅ To access class members using index notation.
• ✅ To perform arithmetic operations.
• ✅ To concatenate strings.
• ✅ To overload assignments.

Explanation:

The correct answer is option (a). The subscript operator is typically overloaded to permit entry to elements of a container class using index notation.

1. Which of the following statement is correct about the overloading of the function call operator ?

• ✅ It cannot be overloaded.
• ✅ It must be a friend function.
• ✅ It allows objects to be used as functions.
• ✅ It can only be overloaded in derived classes.

Explanation:

The correct answer is option (c). The function call operator can be overloaded to allow objects to be used even though they were features.

1. Which of the following operators can be overloaded in C++?

• ✅ sizeof
• ✅ . (dot operator)

Explanation:

The correct answer is option (c). The + operator can be overloaded in C++. Operators such as ::, sizeof, and . cannot be overloaded.

1. How do we overload the prefix increment operator ++ for a class?
Example
Copy
class A {

public:

    A& operator++();

};
Try it Yourself

• ✅ A operator++(int);
• ✅ A& operator++;
• ✅ A& operator++(int);
• ✅ void operator++;

Explanation:

The correct answer is option (b). The prefix increment operator ++ is overloaded as a member function that returns a reference to the class type.

1. What is the correct way to declare a friend function to overload the binary + operator in C++?
Example
Copy
class A {

    int value;

public:

    A(int v) : value(v) {}

    friend A operator+(const A&, const A&);

};
Try it Yourself

• ✅ A operator+(A, A);
• ✅ A operator+(const A&, const A&);
• ✅ A operator+(A&);
• ✅ A operator+(const A&);

Explanation:

The correct answer is option (b). The friend function to overload the binary + operator should be declared with two parameters passed by constant reference.

1. Which of the following is a correct example for function overloading?
Example
Copy
void print(int i);

void print(double f);
Try it Yourself

• ✅ Both
• ✅ None of the above

Explanation:

The correct answer is option (a). The functions print(int) and print(double) have equal names. However, they have different parameter types, which is a valid instance of function overloading.