Explore topic-wise MCQs in C++ Programming.

This section includes 53 Mcqs, each offering curated multiple-choice questions to sharpen your C++ Programming knowledge and support exam preparation. Choose a topic below to get started.

1.

What is the technical word for the function defined in the following program?

A. Constructor
B. Destructor
C. Default Destructor
D. Function Template
Answer» C. Default Destructor
Discussion
2.

Which of the following statement is correct about the program given below? #include class IndiaBix { int x, y; public: IndiaBix() { x = 0; y = 0; } IndiaBix(int xx, int yy) { x = xx; y = yy; } IndiaBix(IndiaBix *objB) { x = objB->x; y = objB->y; } void Display() { cout<< x << " " << y; } }; int main() { IndiaBix objBix( new IndiaBix(20, 40) ); objBix.Display(); return 0; }

A. The program will print the output 0 0 .
B. The program will print the output 20 40 .
C. The program will print the output Garbage Garbage .
D. The program will report compile time error.
Answer» C. The program will print the output Garbage Garbage .
Discussion
3.

What will be the output of the following program? #include class BixBase { public: BixBase() { cout<< "Base OK. "; } virtual ~BixBase() { cout<< "Base DEL. "; } }; class BixDerived: public BixBase { public: BixDerived() { cout<< "Derived OK. "; } ~BixDerived() { cout<< "Derived DEL. "; } }; int main() { BixBase *basePtr = new BixDerived(); delete basePtr; return 0; }

A. Base OK. Derived OK.
B. Base OK. Derived OK. Base DEL.
C. Base OK. Derived OK. Derived DEL.
D. Base OK. Derived OK. Derived DEL. Base DEL.
Answer» E.
Discussion
4.

Which of the following statement is correct about the program given below? #include class IndiaBix { int x; public: IndiaBix() { x = 0; } IndiaBix(int xx) { x = xx; } IndiaBix(IndiaBix &objB) { x = objB.x; } void Display() { cout<< x << " "; } }; int main() { IndiaBix objA(25); IndiaBix objB(objA); IndiaBix objC = objA; objA.Display(); objB.Display(); objC.Display(); return 0; }

A. The program will print the output 25 25 25 .
B. The program will print the output 25 Garbage 25 .
C. The program will print the output Garbage 25 25 .
D. The program will report compile time error.
Answer» B. The program will print the output 25 Garbage 25 .
Discussion
5.

What will be the output of the following program? #include class BixBase { public: int x, y; BixBase(int xx = 0, int yy = 5) { x = ++xx; y = --yy; } void Display() { cout<< --y; } ~BixBase(){} }; class BixDerived : public BixBase { public: void Increment() { y++; } void Display() { cout<< --y; } }; int main() { BixDerived objBix; objBix.Increment(); objBix.Display(); return 0; }

A. 3
B. 4
C. 5
D. Garbage-value
Answer» C. 5
Discussion
6.

What will be the output of the following program? #include class IndiaBix { int x, y; public: IndiaBix(int xx) { x = ++xx; } ~IndiaBix() { cout<< x - 1 << " "; } void Display() { cout<< --x + 1 << " "; } }; int main() { IndiaBix objBix(5); objBix.Display(); int *p = (int*) &objBix; *p = 40; objBix.Display(); return 0; }

A. 6 6 4
B. 6 6 5
C. 5 40 38
D. 6 40 38
Answer» E.
Discussion
7.

What will be the out of the following program? #include class BixBase { public: int x, y; public: BixBase(int xx = 0, int yy = 0) { x = xx; y = yy; } }; class BixDerived : public BixBase { private: BixBase objBase; public: BixDerived(int xx, int yy) : BixBase(xx), objBase(yy) { cout << x << " " << this->x << " " << BixBase::x << " " << this->objBase.x ; } ~BixDerived() { } }; int main() { BixDerived objDev(11, 22); return 0; }

A. 11 22 0 0
B. 11 11 0 22
C. 11 11 11 0
D. 11 11 11 22
Answer» E.
Discussion
8.

Which of the following constructor is used in the program given below? #include class IndiaBix { int x, y; public: IndiaBix(int xx = 10, int yy = 20 ) { x = xx; y = yy; } void Display() { cout<< x << " " << y << endl; } ~IndiaBix() { } }; int main() { IndiaBix objBix; objBix.Display(); return 0; }

A. Copy constructor
B. Simple constructor
C. Non-parameterized constructor
D. Default constructor
Answer» E.
Discussion
9.

What will be the output of the following program? #include class BixBase { public: BixBase() { cout<< "Base OK. "; } ~BixBase() { cout<< "Base DEL. "; } }; class BixDerived: public BixBase { public: BixDerived() { cout<< "Derived OK. "; } ~BixDerived() { cout<< "Derived DEL. "; } }; int main() { BixBase *basePtr = new BixDerived(); delete basePtr; return 0; }

A. Base OK. Derived OK.
B. Base OK. Derived OK. Base DEL.
C. Base OK. Derived OK. Derived DEL.
D. Base OK. Derived OK. Derived DEL. Base DEL.
Answer» C. Base OK. Derived OK. Derived DEL.
Discussion
10.

What is the technical word for the function ~IndiaBix() defined in the following program? #include class IndiaBix { int x, y; public: IndiaBix(int xx = 10, int yy = 20 ) { x = xx; y = yy; } void Display() { cout<< x << " " << y << endl; } ~IndiaBix() { } }; int main() { IndiaBix objBix; objBix.Display(); return 0; }

A. Constructor
B. Destructor
C. Default Destructor
D. Function Template
Answer» C. Default Destructor
Discussion
11.

What will be the out of the following program? #include class BixBase { public: int x, y; public: BixBase(int xx = 0, int yy = 0) { x = xx; y = yy; } }; class BixDerived : public BixBase { private: BixBase objBase; public: BixDerived(int xx, int yy) : BixBase(xx), objBase(yy) { cout << this->x << " " << this->y << " " << objBase.x << " " << objBase.y << " "; } ~BixDerived() { } }; int main() { BixDerived objDev(11, 22); return 0; }

A. 11 22 0 0
B. 11 0 0 22
C. 11 0 22 0
D. 11 22 11 22
Answer» D. 11 22 11 22
Discussion
12.

Which of the following statement is correct about the program given below? #include class IndiaBix { int x; public: IndiaBix(short ss) { cout<< "Short" << endl; } IndiaBix(int xx) { cout<< "Int" << endl; } IndiaBix(float ff) { cout<< "Float" << endl; } ~IndiaBix() { cout<< "Final"; } }; int main() { IndiaBix *ptr = new IndiaBix('B'); return 0; }

A. The program will print the output Short .
B. The program will print the output Int .
C. The program will print the output Float .
D. The program will print the output Final .
Answer» C. The program will print the output Float .
Discussion
13.

What will be the output of the following program? #include class BixBase { public: BixBase() { cout<< "Base OK. "; } }; class BixDerived: public BixBase { public: BixDerived() { cout<< "Derived OK. "; } ~BixDerived() { cout<< "Derived DEL. "; } }; int main() { BixBase objB; BixDerived objD; objD.~BixDerived(); return 0; }

A. Base OK. Derived OK. Derived DEL.
B. Base OK. Base OK. Derived OK. Derived DEL.
C. Base OK. Derived OK. Derived DEL. Derived DEL.
D. Base OK. Base OK. Derived OK. Derived DEL. Derived DEL.
Answer» E.
Discussion
14.

A union that has no constructor can be initialized with another union of __________ type.

A. different
B. same
C. virtual
D. class
Answer» C. virtual
Discussion
15.

When are the Global objects destroyed?

A. When the control comes out of the block in which they are being used.
B. When the program terminates.
C. When the control comes out of the function in which they are being used.
D. As soon as local objects die.
Answer» C. When the control comes out of the function in which they are being used.
Discussion
16.

Which of the following statement is correct about the program given below? #include class IndiaBix { int *p; public: IndiaBix(int xx, char ch) { p = new int(); *p = xx + int(ch); cout<< *p; } ~IndiaBix() { delete p; } }; int main() { IndiaBix objBix(10, 'B'); return 0; }

A. The program will print the output 76.
B. The program will print the output 108.
C. The program will print the output garbage value.
D. The program will report compile time error.
Answer» B. The program will print the output 108.
Discussion
17.

Copy constructor must receive its arguments by __________ .

A. either pass-by-value or pass-by-reference
B. only pass-by-value
C. only pass-by-reference
D. only pass by address
Answer» D. only pass by address
Discussion
18.

A destructor takes __________ arguments.

A. one
B. two
C. three
D. no
Answer» E.
Discussion
19.

If the programmer does not explicitly provide a destructor, then which of the following creates an empty destructor?

A. Preprocessor
B. Compiler
C. Linker
D. main() function
Answer» C. Linker
Discussion
20.

Which of the following statement is correct about constructors?

A. A constructor has a return type.
B. A constructor cannot contain a function call.
C. A constructor has no return type.
D. A constructor has a void return type.
Answer» D. A constructor has a void return type.
Discussion
21.

Which of the following statement is correct about the program given below? #include class Bix { int x; public: Bix(); void Show() const; ~Bix(){} }; Bix::Bix() { x = 5; } void Bix::Show() const { cout<< x; } int main() { Bix objB; objB.Show(); return 0; }

A. The program will print the output 5.
B. The program will print the output Garbage-value.
C. The program will report compile time error.
D. The program will report runtime error.
Answer» B. The program will print the output Garbage-value.
Discussion
22.

Destructor calls are made in which order of the corresponding constructor calls?

A. Reverse order
B. Forward order
C. Depends on how the object is constructed
D. Depends on how many objects are constructed
Answer» B. Forward order
Discussion
23.

Which of the following never requires any arguments?

A. Member function
B. Friend function
C. Default constructor
D. const function
Answer» D. const function
Discussion
24.

Which of the following gets called when an object goes out of scope?

A. constructor
B. destructor
C. main
D. virtual function
Answer» C. main
Discussion
25.

To ensure that every object in the array receives a destructor call, always delete memory allocated as an array with operator __________ .

A. destructor
B. delete
C. delete[]
D. kill[]
Answer» D. kill[]
Discussion
26.

Which of the following are NOT provided by the compiler by default?

A. Zero-argument Constructor
B. Destructor
C. Copy Constructor
D. Copy Destructor
Answer» E.
Discussion
27.

Destructors __________ for automatic objects if the program terminates with a call to function exit or function abort.

A. are called
B. are inherited
C. are not called
D. are created
Answer» D. are created
Discussion
28.

What will be the output of the following program? #include int val = 0; class IndiaBix { public: IndiaBix() { cout<< ++val; } ~IndiaBix() { cout<< val--; } }; int main() { IndiaBix objBix1, objBix2, objBix3; { IndiaBix objBix4; } return 0; }

A. 1234
B. 4321
C. 12344321
D. 12341234
Answer» D. 12341234
Discussion
29.

What will be the out of the following program? #include class BixBase { protected: int x, y; public: BixBase(int xx = 0, int yy = 0) { x = xx; y = yy; } void Show() { cout<< x * this->y << endl; } }; class BixDerived { private: BixBase objBase; public: BixDerived(int xx, int yy) : objBase(xx, yy) { objBase.Show(); } ~BixDerived() { } }; int main() { BixDerived objDev(10, 20); return 0; }

A. 0
B. 100
C. 200
D. 400
Answer» D. 400
Discussion
30.

If the copy constructor receives its arguments by value, the copy constructor would

A. call one-argument constructor of the class
B. work without any problem
C. call itself recursively
D. call zero-argument constructor
Answer» D. call zero-argument constructor
Discussion
31.

A __________ is a constructor that either has no parameters, or if it has parameters, all the parameters have default values.

A. default constructor
B. copy constructor
C. Both A and B
D. None of these
Answer» B. copy constructor
Discussion
32.

Which of the following statement is correct whenever an object goes out of scope?

A. The default constructor of the object is called.
B. The parameterized destructor is called.
C. The default destructor of the object is called.
D. None of the above.
Answer» D. None of the above.
Discussion
33.

Which of the following cannot be declared as virtual?

A. Constructor
B. Destructor
C. Data Members
D. Both A and C
Answer» E.
Discussion
34.

Which of the following statement is correct about the program given below? #include class IndiaBix { int x; public: IndiaBix(short ss) { cout<< "Short" << endl; } IndiaBix(int xx) { cout<< "Int" << endl; } IndiaBix(char ch) { cout<< "Char" << endl; } ~IndiaBix() { cout<< "Final"; } }; int main() { IndiaBix *ptr = new IndiaBix('B'); return 0; }

A. The program will print the output Short .
B. The program will print the output Int .
C. The program will print the output Char .
D. The program will print the output Final .
Answer» D. The program will print the output Final .
Discussion
35.

How many default constructors per class are possible?

A. Only one
B. Two
C. Three
D. Unlimited
Answer» B. Two
Discussion
36.

__________ used to make a copy of one class object from another class object of the same class type.

A. constructor
B. copy constructor
C. destructor
D. default constructor
Answer» C. destructor
Discussion
37.

Which of the following implicitly creates a default constructor when the programmer does not explicitly define at least one constructor for a class?

A. Preprocessor
B. Linker
C. Loader
D. Compiler
Answer» E.
Discussion
38.

Which of the following statement is correct about destructors?

A. A destructor has void return type.
B. A destructor has integer return type.
C. A destructor has no return type.
D. A destructors return type is always same as that of main().
Answer» D. A destructors return type is always same as that of main().
Discussion
39.

Which of the following statement is correct about the program given below? #include class Bix { int x; public: Bix(); ~Bix(); void Show() const; }; Bix::Bix() { x = 25; } void Bix::Show() const { cout<< x; } int main() { Bix objB; objB.Show(); return 0; }

A. The program will print the output 25.
B. The program will print the output Garbage-value.
C. The program will report compile time error.
D. The program will report runtime error.
Answer» D. The program will report runtime error.
Discussion
40.

How many times a constructor is called in the life-time of an object?

A. Only once
B. Twice
C. Thrice
D. Depends on the way of creation of object
Answer» B. Twice
Discussion
41.

Which of the following statement is correct about the program given below? #include class IndiaBix { public: IndiaBix() { cout<< "India"; } ~IndiaBix() { cout<< "Bix"; } }; int main() { IndiaBix objBix; return 0; }

A. The program will print the output India.
B. The program will print the output Bix.
C. The program will print the output IndiaBix.
D. The program will report compile time error.
Answer» D. The program will report compile time error.
Discussion
42.

Constructors __________ to allow different approaches of object construction.

A. cannot overloaded
B. can be overloaded
C. can be called
D. can be nested
Answer» C. can be called
Discussion
43.

What happens when a class with parameterized constructors and having no default constructor is used in a program and we create an object that needs a zero-argument constructor?

A. Compile-time error.
B. Preprocessing error.
C. Runtime error.
D. Runtime exception.
Answer» B. Preprocessing error.
Discussion
44.

Which of the following gets called when an object is being created?

A. constructor
B. virtual function
C. destructor
D. main
Answer» B. virtual function
Discussion
45.

Can a class have virtual destructor?

A. Yes
B. No
Answer» B. No
Discussion
46.

A function with the same name as the class, but preceded with a tilde character (~) is called __________ of that class.

A. constructor
B. destructor
C. function
D. object
Answer» C. function
Discussion
47.

What will be the output of the following program? #include class IndiaBix { int x; public: IndiaBix(int xx, float yy) { cout<< char(yy); } }; int main() { IndiaBix *p = new IndiaBix(35, 99.50f); return 0; }

A. 99
B. ASCII value of 99
C. Garbage value
D. 99.5
Answer» C. Garbage value
Discussion
48.

A class's __________ is called when an object is destroyed.

A. constructor
B. destructor
C. assignment function
D. copy constructor
Answer» C. assignment function
Discussion
49.

Which constructor function is designed to copy objects of the same class type?

A. Create constructor
B. Object constructor
C. Dynamic constructor
D. Copy constructor
Answer» E.
Discussion
50.

It is a __________ error to pass arguments to a destructor.

A. logical
B. virtual
C. syntax
D. linker
Answer» D. linker
Discussion