CS304 - Object Oriented Programming Mcqs

CS304 - Object Oriented Programming

Qus

Ans

Inheritance is a way to

organize data

pass arguments to objects of classes

add features to existing classes without rewriting them

improve data-hiding and encapsulation

To convert from a user-defined class to a basic type, you would most likely use

a built-in conversion operator

a one-argument constructor

an overloaded = operator

a conversion operator that‘s a member of the class

A C++ class is similar to --------------------

Structure

Header File

Library File

None of the given

a‘A static member function can be called, even when a class is not __________

Declared

Define

Instantiated

Called

Which one of the following features of OOP is used to derive a class from another?

Encapsulation

Polymorphism

Data hiding

Inheritance

What is a class?

A class is a section of computer memory containing objects

A class is a section of the hard disk reserved for object oriented programs

A class is the part of an object that contains the variables

A class is a description of a kind of object

The main function of scope resolution operator (::) is,

To define an object

To define a data member

To link the definition of an identifier to its declaration

All of the given

Which of the following operators always takes no argument if overloaded?

Assume a class C with objects obj1, obj2, and obj3. For the statement obj3 = obj1 - obj2 to work correctly, if the overloaded - operator must

take two arguments

return a value

create a named temporary object

take four arguments

The keyword that is used that the variable can not change state?

static

const

friend

private

Suppose obj1 and obj2 are two objects of a user defined class A. An + operator is overloaded to add obj1 and obj2 using the function call obj1+obj2. Identify the correct function prototype against the given call?

A operator + ( A &obj);

int + operator();

int operator (plus) ();

A operator(A &obj3);

We can get only one unique value which can be used by all the objects of that class by the use of,

static variables

dynamic variables

instance variables

data members

A member function having the same name as that of a class and a ~ sign with it is called,

Constructor

Getter

Setter

Destructor

Using encapsulation we can achieve

Information hiding

Least interdependencies among modules

Implementation independenc

All of given options

The >= operator can be overloaded

True

False

A static member function cannot be declared

Static

Implicit

Explicit

Virtual

Static variables act like a global variable in the context or scope of the class

True

False

The compiler won‘t object if you overload the * operator to perform division

True

False

We can use "this" pointer in the constructor in the body and even in the initialization list of any class if we are careful

True

False

Which operator can not be overloaded?

The relation operator ( >= )

Assignment operator ( = )

Script operator ( [] )

Conditional operator (? : )

An overloaded operator always requires one less argument than its number of operands

True

False

A generalization-specialization relation between classes are implemented using

data hiding

friend classes

encapsulation

inheritance

In OOP a class is an example of _____

Data Type

Abstract Type

User Defined Type

None of the given

Identify which of the following overloaded operator function‘s declaration is appropriate for the given call? Rational_number_1 + 2.325 Where Rational_number_1 is an object of user defined class Rational_number

Rational_number operator+( Rational_number & obj);

Rational_number operator+(double& obj);

Rational_number operator+(Rational_number &obj, double& num);

operator+(double& obj);

A class can be identified from a statement by -------------

Noun

Pronoun

Verb

Adverb

The members of a class that can be accessed without creating the object of the class is called

Private member

Data Member

Public Member

Static

Suppose there is an object of type Person, which of the following can be considered as one of its attributes

Name

Age

Work()

Both Name and Age

What a derived class can add?

New data members

New member functions and New friend functions

New constructors and destructor

All of given

________ is/are used to access information hidden within an object?

Interface

Private data members

Private member functions

Both public and private members

this pointers are not accessible for static member functions

True

False