C++ MCQ with Answers

C++ is a general-purpose programming language. It was designed and implemented by Bjarne Stroustrup in 1979 at Bell Labs. It runs on a variety of platforms, such as Windows, MacOS, and the various versions of UNIX. C++ is

  • A superset of C
  • Supports data abstraction
  • Supports object-oriented programming
  • Supports generic programming.

Types: Types are fundamental to any program. 

C++ has extensive support for types:

  • Primitive types(characters, integers, floating-point numbers, etc.)- Defined by the language itself.
  • User-defined types - Provides mechanisms that let us define our own data types.

Primitive Types can be divided into two types:

  • Arithmetic Type -
    • Integral Types(Characters, integers, boolean values, etc)
    • Floating-point types(float, double, etc)
  • Void(special type)

Variables: A variable provides us with named storage that our programs can manipulate.
Each variable in C++ has a type. It determines the size and layout of the variable’s memory.
It also determines the range of values that can be stored within that memory along with the set of operations that can be applied to the variable. A simple variable definition consists of:

  • A type specifier.
  • A list of one or more variable names separated by commas, and ends with a semicolon.

Classes and Objects in C++:

  • Class is a description of an object.
  • An object is an instance of a class

Instance member variable: Attributes, data members, field, properties.
Instance member functions: Methods, procedures, actions, operations, services.

Access Specifier: There are three types of access specifiers in class:

  • Private
  • Public
  • Protected

Features of OOPS: There are primarily four pillars of OOPS:

  • Data abstraction: Data hiding
  • Inheritance: Reusability
  • Polymorphism: Object to take many forms
  • Encapsulation: Data hiding

C++ MCQ

1. 

What is an object in c++?

It is function of class

It is instance of class

It is datatype of class

It is part of the syntax of class
2. 

Identify the incorrect constructor type.

Friend constructor

Default constructor

Parameterized constructor

Copy constructor
3. 

Identify the logical AND operator.

||

&&

&

!
4. 

Identify the scope resolution operator.

:

::

?

None
5. 

Identify the size of int datatype in C++.

1 byte

2 bytes

4 bytes

Depends on compiler
6. 

Identify the storage classes that have global visibility.

extern

auto

register

static
7. 

Size of wchat_t is.

2

4

2 or 4

Depends on number of bits in system
8. 

The constants in C++ are also known as?

pre-processor

literals

const

none
9. 

Total types of constructors in C++ are?

1

2

3

4
10. 

Total types of errors in C++.

1

2

3

4
11. 

Under which pillar of OOPS does base class and derived class relationship come?

Polymorphism

Inheritance

Encapsulation

Abstraction
12. 

Using which of the following data type can 19.54 be represented?

void

double

int

None
13. 

Using which of the following keywords can an exception be generated?

threw

throws

throw

catch
14. 

What does a C++ class hold?

Function

Data

Arrays

Both a and b
15. 

Identify the format string among the following.

&

\n

%d

None
16. 

What is do-while loop also known as?

Exit control

Entry control

Per tested

All of the above
17. 

What is the ASCII value of ‘\0’ character?

32

24

48

0
18. 

What is the number of parameters that a default constructor requires?

0

1

2

3
19. 

When can an inline function be expanded?

Runtime

Compile time

Never gets expanded

All of the above
20. 

Which of the following data type is supported in C++ but not in C?

int

bool

double

float
21. 

Which of the following functions can be inherited from base class?

Constructor

Destructor

Static

None
22. 

Which of the following is not a type of inheritance?

Multiple

Multilevel

Distributed

Heirarchical
23. 

Which of the following is the correct identifier?

2var_name

2VAR_NAME

$varname

var_name12
24. 

Which of the following is “address of operator”?.

*

&

[]

&&
25. 

Which of the following loops is best when we know the number of iterations?

While loop

Do while

For loop

All of the above
26. 

Which of the following types is the language C++?

Procedural

Statically typed language

Dynamically typed language

All of the above
27. 

Why are comments used?

Make the program run faster

To help others read & understand the program

Increase the size of the executable program

Make a program compile easier
28. 

Find the output of the following program.

main(){
 char ch[] = “Interviewbit Scaler”; 
 int l = strlen(ch);
 cout << l << endl;
}

18

19

20

21
29. 

C++ uses which approach?

right -left

Top-down

left-right

bottom -up
30. 

Choose the correct default return value of function.

int

void

char

float
31. 

Choose the correct option which is mandatory in a function.

return_type

parameters

function_name

Both a and c
32. 

Choose the correct subscript operator.

[ ]

{ }

*

( )
33. 

Choose the option below which is not a member of class.

Friend function

Static function

Virtual function

Const function
34. 

Choose the size of the below struct.

Struct{
Int a;
Char b;
Float c;
}

2

4

7

10
35. 

Choose the type of loop which is guaranteed to execute at-least once?

for loop

do-while

while

None
36. 

Data members and member functions of a class are private by.default. True or False?

True

False

Depends on code

None
37. 

Find the output of the following program.

main(){
 int i = (1, 2, 3);
 cout << i << endl;
}

1

2

3

Error
38. 

Find the output of the following program.

main(){
  int a, b = 10;
  a = 95 / 10;
  cout << a << endl;
}

9

9.5

10

9.0
39. 

Find the output of the following program.

main(){
 int a = 10 / 0;
}

0

Compilation error

exception

None
40. 

Find the output of the following program.

main(){
  int a = 10, b, c;
  b  = a++;
  c = a;
  cout << a << “ “ <<b <<” “<< c << endl;
}

10 11 11

11 11 11

11 10 11

10 10 10
41. 

By which of the following can the if-else statement be replaced?

Bitwise operator

Logical operator

Conditional operator

Arithmetic operator
42. 

Find the output of the following program.

main(){
 cout <<  -10 - 10 -10;
}

0

-30

30

20
43. 

Find the output of the following program.

main(){
  Float a = 5;
  switch(a){
     Case 5: cout <<”Interviewbit”;
     Default: cout <<”Scaler”;
  }
}

Interviewbit

Scaler

InterviewbitScaler

Error
44. 

goto can be classified into?

label

variable

operator

function
45. 

How many times will the print statement be executed?

main(){
  int i = 0;
  label:
  cout << “Interviewbit;
  i++;
  if(i < 3){
    goto label;
  }
}

1 time

2 times

3 times

Error
46. 

How much bytes of memory does void occupy?

1

0

2

4
47. 

Identify the correct definition of ‘*’ operator in pointer.

Address of operator

Value of address operator

Multiplication operator

All of the above
48. 

Identify the correct escape sequence used for the new line.

\t

\n

\a

None
49. 

Identify the correct example for a pre-increment operator.

++n

n++

 - -n

+n
50. 

Identify the correct extension of the user-defined header file in C++.

.cpp

.hg

.h

.hf
51. 

Identify the correct function from which the execution of C++ program starts?

new()

start()

pow()

main()
52. 

Identify the correct range of signed char.

-256 to 255

-128 to 127

0 to 255

0 to 127
53. 

Identify the correct syntax for declaring arrays in C++.

array arr[10]

array{10}

int arr[10]

int arr
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