33 Lecture

1. What is operator overloading? A. The process of creating new operators B. The process of redefining existing operators C. The process of removing existing operators D. The process of renaming existing operators

Answer: B. The process of redefining existing operators

2. Which of the following operators cannot be overloaded in C++? A. + B. - C. * D. ::

Answer: D. ::

3. Which of the following is not a unary operator? A. + B. - C. * D. /

Answer: D. /

4. Which of the following operators must be overloaded as a member function? A. = B. [] C. () D. <<

Answer: C. ()

5. Which of the following operators must be overloaded as a friend function? A. = B. + C. ++ D. []

Answer: D. []

6. Which of the following is the correct syntax for overloading the addition operator in C++? A. operator add() B. operator +() C. operator +(int) D. operator add(int)

Answer: B. operator +()

7. Which of the following operators is used to access the elements of an array? A. [] B. () C. = D. *

Answer: A. []

8. Which of the following operators is used to define the behavior of a user-defined object when it is converted to a basic data type? A. () B. = C. << D. >>

Answer: A. ()

9. Which of the following operators cannot be overloaded as a friend function? A. + B. - C. = D. ()

Answer: C. =

10. Which of the following is not a binary operator? A. + B. * C. ++ D. /

Answer: C. ++

1. What is operator overloading? Answer: Operator overloading is a feature in object-oriented programming that allows operators such as +, -, and * to have different meanings when applied to user-defined objects.

2. What is the difference between unary and binary operators? Answer: Unary operators take only one operand, whereas binary operators take two operands.

3. What is the syntax for overloading an operator in C++? Answer: The syntax for overloading an operator in C++ is: operator symbol(parameters).

4. What is a member function in C++? Answer: A member function is a function that is defined inside a class and can access the private members of the class.

5. Can the assignment operator be overloaded as a friend function? Answer: No, the assignment operator cannot be overloaded as a friend function.

6. What is the purpose of overloading the << operator in C++? Answer: The << operator is overloaded to provide a convenient way to output user-defined objects to the console.

7. Can the scope resolution operator (::) be overloaded in C++? Answer: No, the scope resolution operator cannot be overloaded in C++.

8. What is the difference between the postfix and prefix versions of the increment operator (++)? Answer: The postfix version returns the original value of the operand, whereas the prefix version returns the incremented value of the operand.

9. What is the difference between a friend function and a member function in C++? Answer: A friend function is not a member of the class, but has access to the private members of the class. A member function is a function that is defined inside the class.

10. Can the conditional operator (?:) be overloaded in C++? Answer: No, the conditional operator (?:) cannot be overloaded in C++.

Operator overloading is a powerful feature of C++ that allows operators to be redefined for user-defined objects. By overloading operators, programmers can define how operators such as +, -, and * behave when applied to user-defined objects, providing a more intuitive and concise syntax for working with objects. To overload an operator, a special function called an operator function must be defined. The operator function has the keyword operator followed by the symbol of the operator being overloaded. For example, to overload the + operator for a class, the operator function would be defined as operator+(const ClassName& obj). The const ClassName& obj parameter allows the object to be passed by reference, reducing the overhead of copying objects. Operator overloading can be used to provide custom behavior for objects when they are added, subtracted, multiplied, divided, compared, and more. For example, a class representing a complex number can overload the + operator to add two complex numbers together. In addition to member functions, operator overloading can also be implemented using friend functions, which are functions that are not members of a class but have access to its private members. Friend functions can be useful when overloading operators that require access to private data members of the class. It is important to note that not all operators can be overloaded in C++. Some operators, such as the scope resolution operator (::) and the conditional operator (?:), cannot be overloaded. Additionally, some operators, such as the assignment operator (=), must be overloaded as a member function. Overall, operator overloading is a powerful tool in C++ that allows for the creation of intuitive and concise syntax for working with user-defined objects. However, care should be taken to ensure that operator overloading is used appropriately and does not lead to confusion or unintended behavior.