100+ CPP Programming Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) , Information Technology Engineering (IT) , Programming Languages , Master of Science in Software Engineering (MSc SE) .

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1.	Which of the followings is/are automatically added to every class, if we do not write our own?
A.	Copy Constructor
B.	Assignment Operator
C.	A constructor without any parameter
D.	All of the above
Answer» D. All of the above

2.	When a copy constructor may be called?
A.	When an object of the class is returned by value.
B.	When an object of the class is passed (to a function) by value as an argument.
C.	When an object is constructed based on another object of the same class
D.	All of the above
Answer» D. All of the above

3.	Constructors have _____ return type.
A.	void
B.	char
C.	int
D.	no
Answer» D. no

4.	Implicit return type of a class constructor is:
A.	not of class type itself
B.	class type itself
C.	a destructor of class type
D.	a destructor not of class type
Answer» B. class type itself

5.	Which of the following is true about constructors? 1) They cannot be virtual. 2) They cannot be private. 3) They are automatically called by new operator.
A.	All 1, 2, and 3
B.	Only 1 and 3
C.	Only 1 and 2
D.	Only 2 and 3
Answer» B. Only 1 and 3

6.	Output of following program? #include<iostream> using namespace std; class Point { Point() { cout << "Constructor called"; } }; int main() { Point t1; return 0; }
A.	Compiler Error
B.	Runtime Error
C.	Constructor called
D.	None of the above
Answer» A. Compiler Error

7.	#include<iostream> using namespace std; class Point { public: Point() { cout << "Constructor called"; } }; int main() { Point t1, *t2; return 0; }
A.	Compiler Error
B.	Constructor called Constructor called
C.	Constructor called
D.	None of the above
Answer» C. Constructor called

8.	Which operator is having the highest precedence?
A.	postfix
B.	unary
C.	shift
D.	equality
Answer» D. equality

9.	Which of the following is FALSE about references in C++?
A.	References cannot be NULL
B.	A reference must be initialized when declared
C.	Once a reference is created, it cannot be later made to reference another object; it cannot be reset.
D.	References cannot refer to constant value
Answer» D. References cannot refer to constant value

10.	Which of the following functions must use reference?
A.	Assignment operator function
B.	Copy Constructor
C.	Destructor
D.	Parameterized constructor
Answer» B. Copy Constructor

11.	Output of following C++ program? #include<iostream> using namespace std; int main() { int x = 10; int& ref = x; ref = 20; cout << "x = " << x << endl ; x = 30; cout << "ref = " << ref << endl; return 0; }
A.	x = 20; ref = 30
B.	x = 20; ref = 20
C.	x = 10; ref = 30
D.	x = 30; ref = 30
Answer» A. x = 20; ref = 30

12.	What is the difference between struct and class in C++?
A.	All members of a structure are public and structures don’t have constructors and destructors
B.	Members of a class are private by default and members of struct are public by default. When deriving a struct from a class/struct, default access-specifier for a base class/struct is public and when deriving a class, default access specifier is private.
C.	All members of a structure are public and structures don’t have virtual functions
D.	All of the above
Answer» B. Members of a class are private by default and members of struct are public by default. When deriving a struct from a class/struct, default access-specifier for a base class/struct is public and when deriving a class, default access specifier is private.

15.	Which of the following is true?
A.	All objects of a class share all data members of class
B.	Objects of a class do not share non-static members. Every object has its own copy.
C.	Objects of a class do not share codes of non-static methods, they have their own copy
D.	None of the above
Answer» B. Objects of a class do not share non-static members. Every object has its own copy.

16.	A member function can always access the data in __________, (in C++).
A.	the class of which it is member
B.	the object of which it is a member
C.	the public part of its class
D.	the private part of its class
Answer» A. the class of which it is member

17.	Which of the following is not correct for virtual function in C++?
A.	Must be declared in public section of class.
B.	Virtual function can be static.
C.	Virtual function should be accessed using pointers.
D.	Virtual function is defined in base class.
Answer» B. Virtual function can be static.

13.	Predict the output of following C++ program. #include<iostream> using namespace std; class Empty {}; int main() { cout << sizeof(Empty); return 0; }
A.	A non-zero value
B.	0
C.	Compiler Error
D.	Runtime Error
Answer» A. A non-zero value

14.	class Test { int x; }; int main() { Test t; cout << t.x; return 0; }
A.	0
B.	Garbage Value
C.	Compiler Error
D.	None
Answer» C. Compiler Error

18.	Which of the following is not correct (in C++)? 1. Class templates and function templates are instantiated in the same way 2. Class templates differ from function templates in the way they are initiated 3. Class template is initiated by defining an object using the template argument 4. Class templates are generally used for storage classes
A.	(1)
B.	(2), (4)
C.	(2), (3), (4)
D.	(4)
Answer» C. (2), (3), (4)

19.	Which of the following cannot be passed to a function in C++?
A.	Constant
B.	Structure
C.	Array
D.	Header file
Answer» D. Header file

20.	Which of the following, in C++, is inherited in a derived class from base class?
A.	Constructor
B.	Destructor
C.	Data members
D.	Virtual methods
Answer» C. Data members

21.	Which of the following is a correct statement?
A.	Composition is a strong type of association between two classes with full ownership.
B.	Composition is a strong type of association between two classes with partial ownership.
C.	Composition is a weak type of association between two classes with partial ownership.
D.	Composition is a weak type of association between two classes with strong ownership.
Answer» A. Composition is a strong type of association between two classes with full ownership.

22.	Which of the following is not a correct statement?
A.	Every class containing abstract method must be declared abstract.
B.	Abstract class can directly be initiated with ‘new’ operator.
C.	Abstract class can be initiated.
D.	Abstract class does not contain any definition of implementation.
Answer» B. Abstract class can directly be initiated with ‘new’ operator.

23.	When a method in a subclass has the same name and type signatures as a method in the superclass, then the method in the subclass _____ the method in the superclass.
A.	Overloads
B.	Friendships
C.	Inherits
D.	Overrides
Answer» D. Overrides

24.	It is possible to define a class within a class termed as nested class. There are _____ types of nested classes.
A.	2
B.	3
C.	4
D.	5
Answer» A. 2

25.	When one object reference variable is assigned to another object reference variable then
A.	a copy of the object is created.
B.	a copy of the reference is created.
C.	a copy of the reference is not created.
D.	it is illegal to assign one object reference variable to another object reference variable.
Answer» B. a copy of the reference is created.

100+ CPP Programming Solved MCQs

Which of the followings is/are automatically added to every class, if we do not write our own?

When a copy constructor may be called?

Constructors have _____ return type.

Implicit return type of a class constructor is:

Which of the following is true about constructors? 1) They cannot be virtual. 2) They cannot be private. 3) They are automatically called by new operator.

Output of following program? #include<iostream> using namespace std; class Point { Point() { cout << "Constructor called"; } }; int main() { Point t1; return 0; }

#include<iostream> using namespace std; class Point { public: Point() { cout << "Constructor called"; } }; int main() { Point t1, *t2; return 0; }

Which operator is having the highest precedence?

Which of the following is FALSE about references in C++?

Which of the following functions must use reference?

Output of following C++ program? #include<iostream> using namespace std; int main() { int x = 10; int& ref = x; ref = 20; cout << "x = " << x << endl ; x = 30; cout << "ref = " << ref << endl; return 0; }

What is the difference between struct and class in C++?

Predict the output of following C++ program. #include<iostream> using namespace std; class Empty {}; int main() { cout << sizeof(Empty); return 0; }

class Test { int x; }; int main() { Test t; cout << t.x; return 0; }

Which of the following is true?

A member function can always access the data in __________, (in C++).

Which of the following is not correct for virtual function in C++?

Which of the following cannot be passed to a function in C++?

Which of the following, in C++, is inherited in a derived class from base class?

Which of the following is a correct statement?

Which of the following is not a correct statement?

When a method in a subclass has the same name and type signatures as a method in the superclass, then the method in the subclass _____ the method in the superclass.

It is possible to define a class within a class termed as nested class. There are _____ types of nested classes.

When one object reference variable is assigned to another object reference variable then

Which of the following is not a member of class?

How can we restrict dynamic allocation of objects of a class using new?

Which of the following operators cannot be overloaded?

Which of the following operators are overloaded by default by the compiler in every user defined classes even if user has not written? 1) Comparison Operator (==) 2) Assignment Operator (=)

Which of the following operators should be preferred to overload as a global function rather than a member method?

How C++ compiler does differ between overloaded postfix and prefix operators?

Which of the following operator functions cannot be global?

Which of the following is true about this pointer?

What is the use of this pointer?

Which of the following in Object Oriented Programming is supported by Function overloading and default arguments features of C++?

Output of the program? #include<iostream> using namespace std; int fun(int x = 0, int y = 0, int z) { return (x + y + z); } int main() { cout << fun(10); return 0; }

Output of following program? #include <iostream> using namespace std; int fun(int=0, int = 0); int main() { cout << fun(5); return 0; } int fun(int x, int y) { return (x+y); }

Which of the following is true?

If a function is friend of a class, which one of the following is wrong?

Which one of the following is correct, when a class grants friend status to another class?

In C++, const qualifier can be applied to 1) Member functions of a class 2) Function arguments 3) To a class data member which is declared as static 4) Reference variables

How to create a dynamic array of pointers (to integers) of size 10 using new in C++? Hint: We can create a non-dynamic array using int *arr[10]

Which of the following is true about new when compared with malloc: 1) new is an operator, malloc is a function 2) new calls constructor, malloc doesn’t 3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.

Predict the output? #include <iostream> using namespace std; class Test { int x; Test() { x = 5; } }; int main() { Test *t = new Test; cout << t->x; }

Is it fine to call delete twice for a pointer? #include<iostream> using namespace std; int main() { int *ptr = new int; delete ptr; delete ptr; return 0; }

When the inheritance is private, the private methods in base class are __________ in the derived class (in C++).

What happens when delete is used for a NULL pointer? int *ptr = NULL; delete ptr;

Which of the following is true about virtual functions in C++?

Which of the following is true about pure virtual functions? 1) Their implementation is not provided in a class where they are declared. 2) If a class has a pure virtual function, then the class becomes abstract class and an instance of this class cannot be created.

What is the size of wchar_t in C++?

Which of the following is true about constructors?
1) They cannot be virtual.
2) They cannot be private.
3) They are automatically called by new operator.

Output of following program?
#include<iostream>
using namespace std;
class Point {
Point() { cout << "Constructor called"; }
}; int main()
{
Point t1;
return 0;
}

#include<iostream>
using namespace std;
class Point {
public:
Point() { cout << "Constructor called"; }
};
int main()
{
Point t1, *t2;
return 0;
}

Output of following C++ program?
#include<iostream>
using namespace std;
int main()
{
int x = 10;
int& ref = x;
ref = 20;
cout << "x = " << x << endl ;
x = 30;
cout << "ref = " << ref << endl;
return 0;
}

Predict the output of following C++ program.
#include<iostream>
using namespace std;
class Empty {};
int main() {
cout << sizeof(Empty);
return 0;
}

class Test {
int x;
};
int main() {
Test t;
cout << t.x;
return 0;
}

Output of the program?
#include<iostream>
using namespace std;
int fun(int x = 0, int y = 0, int z)
{ return (x + y + z); }
int main()
{
cout << fun(10);
return 0;
}

Output of following program?
#include <iostream>
using namespace std;
int fun(int=0, int = 0);
int main()
{
cout << fun(5);
return 0;
}
int fun(int x, int y)
{
return (x+y);
}

In C++, const qualifier can be applied to
1) Member functions of a class
2) Function arguments
3) To a class data member which is declared as static
4) Reference variables

Which of the following is true about new when compared with malloc:
1) new is an operator, malloc is a function
2) new calls constructor, malloc doesn’t
3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.

Predict the output?
#include <iostream>
using namespace std;
class Test
{
int x;
Test()
{
x = 5;
} };
int main()
{
Test *t = new Test;
cout << t->x;
}

Is it fine to call delete twice for a pointer?
#include<iostream>
using namespace std;
int main()
{
int *ptr = new int;
delete ptr;
delete ptr;
return 0;
}

What happens when delete is used for a NULL pointer?
int *ptr = NULL;
delete ptr;

Which of the following is true about pure virtual functions?
1) Their implementation is not provided in a class where they are declared.
2) If a class has a pure virtual function, then the class becomes abstract class and an
instance of this class cannot be created.

26.	Which of the following is not a member of class?
A.	Static function
B.	Friend function
C.	Const function
D.	Virtual function
Answer» B. Friend function

27.	How can we restrict dynamic allocation of objects of a class using new?
A.	By overloading new operator
B.	By making an empty private new operator.
C.	By making an empty private new and new[] operators
D.	By overloading new operator and new[] operators
Answer» C. By making an empty private new and new[] operators

28.	Which of the following operators cannot be overloaded?
A.	. (Member Access or Dot operator)
B.	?: (Ternary or Conditional Operator)
C.	:: (Scope Resolution Operator)
D.	All of the above
Answer» D. All of the above

29.	Which of the following operators are overloaded by default by the compiler in every user defined classes even if user has not written? 1) Comparison Operator (==) 2) Assignment Operator (=)
A.	Both 1 and 2
B.	Only 1
C.	Only 2
D.	None of the two
Answer» C. Only 2

30.	Which of the following operators should be preferred to overload as a global function rather than a member method?
A.	Postfix ++
B.	Comparison Operator
C.	Insertion Operator <<
D.	Prefix++
Answer» C. Insertion Operator <<

31.	How C++ compiler does differ between overloaded postfix and prefix operators?
A.	C++ doesn’t allow both operators to be overloaded in a class
B.	A postfix ++ has a dummy parameter
C.	A prefix ++ has a dummy parameter
D.	By making prefix ++ as a global function and postfix as a member function.
Answer» B. A postfix ++ has a dummy parameter

32.	Which of the following operator functions cannot be global?
A.	new
B.	delete
C.	Conversion Operator
D.	All of the above
Answer» C. Conversion Operator

33.	Which of the following is true about this pointer?
A.	It is passed as a hidden argument to all function calls
B.	It is passed as a hidden argument to all non-static function calls
C.	It is passed as a hidden argument to all static functions
D.	None of the above
Answer» B. It is passed as a hidden argument to all non-static function calls

34.	What is the use of this pointer?
A.	When local variable’s name is same as member’s name, we can access member using this pointer.
B.	To return reference to the calling object
C.	Can be used for chained function calls on an object
D.	All of the above
Answer» D. All of the above

35.	Which of the following in Object Oriented Programming is supported by Function overloading and default arguments features of C++?
A.	Inheritance
B.	Polymorphism
C.	Encapsulation
D.	None of the above
Answer» B. Polymorphism