CS304 MCQs with Explanation by Edu

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Cs304 Handouts Finals Mcqs

Q1. How does the compiler distinguish between

pre-increment and post-increment operator

overloading?

1. By return type
2. By dummy int argument
3. By function name
4. By class access

Correct answer: By dummy int argument

A dummy int argument is used in the function signature to indicate post-increment overloading.

Q2. In C++, which keyword is used to restrict

automatic implicit type conversions via

constructors?

1. const
2. static
3. explicit
4. virtual

Correct answer: explicit

The explicit keyword prevents the compiler from performing implicit conversions using single-argument constructors.

Q3. When converting a user-defined class to a basic

type (e.g., int), which syntax is correct?

1. int operator()
2. operator int()
3. int operator int()
4. void operator int()

Correct answer: operator int()

Conversion operators do not specify a return type in their declaration; it is implicitly taken as the type name.

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Q4. In inheritance, the relationship between a derived

class and a base class is best described as:

A. HAS-A

B. IS-A

C. USES-A

D. PART-OF Inheritance represents an 'IS-A' relationship (e.g., a Student IS A Person).

Q5. What is the order of constructor execution when

an object of a derived class is created?

1. Derived first, then Base
2. Base first, then Derived
3. Random order
4. Simultaneous execution

Correct answer: Base first, then Derived

The base class constructor is executed first to initialize the anonymous base object before the derived class constructor.

Q6. Which access specifier ensures that members

are accessible in the derived class but not from

outside?

1. private
2. public
3. protected
4. friend

Correct answer: protected

Protected members are accessible in derived classes but remain private to the outside world.

Q7. When overloading the pre-increment operator

(++h), what should generally be returned?

1. A copy of the object
2. void
3. A reference to the object
4. An integer code

Correct answer: A reference to the object

Returning a reference allows the object to be used as an lvalue in expressions.