C++ Learning Quizzes: Test Your Knowledge and Skills

Question 1

In C++, which data type is specifically designed to store multiple values of the same type?

Accepted Answer

array

Answer

int

Answer

string

Question 2

Which of the following is NOT a feature of the C++ programming language?

Accepted Answer

Garbage collection

Answer

Object-oriented programming

Answer

Dynamic memory allocation

Question 3

Which of the following is the correct syntax of a try-catch block in C++?

Accepted Answer

try { // code } catch (...) { // error handling }

Answer

catch { // error handling } try { // code }

Answer

try ( // code ) { // error handling }

Answer

try : // code catch (...) { // error handling }

Question 4

Which control structure is used to execute a block of code repeatedly as long as a condition remains true?

Accepted Answer

while loop

Answer

if statement

Answer

for loop

Answer

switch statement

Question 5

What is the relationship between a class and an object in C++?

Accepted Answer

A class is a blueprint, while an object is an instance of that blueprint

Answer

An object is a blueprint, while a class is an instance of that blueprint

Answer

They are essentially the same concept

Answer

A class is a data type, while an object is a variable

Question 6

What does the 'this' pointer in C++ refer to?

Accepted Answer

The current object

Answer

The parent object

Answer

The child object

Answer

The global object

Question 7

What will be the output of the following C++ code: std::cout << 10 + 20 << std::endl;

Accepted Answer

30

Answer

1020

Answer

Compilation error

Answer

Runtime error

Question 8

Which of the following is a valid function declaration in C++?

Accepted Answer

int sum(int a, int b);

Answer

sum(int a, int b);

Answer

int a, int b);

Answer

int sum(a, b)

Question 9

What is the main purpose of using namespaces in C++?

Accepted Answer

To organize code and prevent name collisions

Answer

To speed up compilation time

Answer

To enhance security

Answer

To reduce memory usage

Question 10

What's the purpose of 'const' in C++?

Accepted Answer

Defining a constant variable

Answer

Creating a pointer variable

Answer

Declaring a global variable

Answer

Returning a constant value

Question 11

What's the C++ syntax for a basic 'if' statement?

Accepted Answer

if(condition) { }

Answer

if condition { }

Answer

{ if(condition) }

Answer

condition { if }

Question 12

Arrays in C++ are typically traversed using which loop structure?

Accepted Answer

for

Answer

while

Answer

do-while

Answer

foreach

Question 13

In C++, the 'this' pointer refers to what?

Accepted Answer

The current object

Answer

The parent object

Answer

The main function

Answer

The global scope

Question 14

What output will the following C++ code produce? cout << (10 % 3) << endl;

Accepted Answer

1

Answer

0

Answer

3

Answer

10

Question 15

What is the purpose of the 'main' function in a C++ program?

Accepted Answer

To serve as the program's entry point

Answer

To manage input and output operations

Answer

To declare global variables

Answer

To execute reusable code

Question 16

Which of the provided control structures is designed to repeatedly execute a code block until a specific condition is no longer met?

Accepted Answer

while

Answer

if-else

Answer

for

Answer

switch

Question 17

In C++, what is the fundamental distinction between a class and an object?

Accepted Answer

A class serves as a blueprint, while an object represents a specific instance of that blueprint

Answer

An object serves as a blueprint, while a class represents a specific instance of that blueprint

Answer

A class and an object are essentially identical

Answer

An object can inherit traits from multiple classes, whereas a class can only inherit traits from one object

Question 18

What is the main purpose of the 'using namespace std;' statement in a C++ program?

Accepted Answer

To enable access to standard library functions without specifying the namespace

Answer

To establish a new namespace

Answer

To declare global variables

Answer

To define a macro

Question 19

Which of the given options is not a valid access specifier in C++?

Accepted Answer

hidden

Answer

public

Answer

private

Answer

protected

Question 20

In C++, what is the primary distinction between a header file and a source file?

Accepted Answer

Declarations are kept in header files, while definitions are kept in source files

Answer

Declarations are kept in source files, while definitions are kept in header files

Answer

Both header files and source files contain a mix of declarations and definitions

Answer

Header files are used for input, while source files are used for output

Question 21

Which of the following syntaxes is valid for creating a dynamic array in C++?

Accepted Answer

int* arr = new int[size];

Answer

int* arr[size];

Answer

int arr[size] = new int;

Answer

int arr = new int[size];

Question 22

What is the primary function of the 'this' pointer in C++?

Accepted Answer

To reference the object's current state

Answer

To provide access to the parent class

Answer

To instantiate a new object

Answer

To store the memory address of the main function

Question 23

Which data type in C++ is used to store whole numbers?

Accepted Answer

int

Answer

float

Answer

double

Answer

char

Question 24

What is the primary purpose of the "iostream" library in C++?

Accepted Answer

To perform input and output operations

Answer

To conduct mathematical calculations

Answer

To create and manipulate objects

Answer

To store and retrieve data from memory

Question 25

What is the fundamental difference between a class and an object in C++?

Accepted Answer

A class is a blueprint, an object is an instance

Answer

An object is a blueprint, a class is an instance

Answer

They represent the same concept

Answer

A class is an instance variable, an object is a local variable

Question 26

What operator in C++ is used to access the value pointed to by a pointer?

Accepted Answer

*

Answer

&

Answer

~

Answer

!

Question 27

What is the purpose of the "const" keyword in C++?

Accepted Answer

To declare a constant variable

Answer

To declare a reference variable

Answer

To declare a pointer variable

Answer

To declare a function that cannot be modified

Question 28

Which access modifier in C++ controls access to members within derived classes?

Accepted Answer

protected

Answer

public

Answer

private

Answer

internal

Question 29

What is the primary role of the "this" pointer in C++?

Accepted Answer

To reference the current object

Answer

To reference the parent class

Answer

To reference the global scope

Answer

To reference a local variable

Question 30

Which type of inheritance in C++ allows a class to inherit from multiple parent classes?

Accepted Answer

Multiple inheritance

Answer

Single inheritance

Answer

Hierarchical inheritance

Answer

Hybrid inheritance

Question 31

In C++, what is the purpose of templates? Provide an example to illustrate their usage.

Accepted Answer

Templates allow defining functions or classes that work with various data types without creating separate implementations for each type.

Answer

Templates are primarily used for organizing data in a structured manner.

Answer

Templates are specifically used for creating dynamic arrays in C++.

Question 32

In C++, what is the correct syntax to declare a function that returns an integer and takes two integer parameters?

Accepted Answer

int myFunction(int, int)

Answer

function myFunction(int, int)

Answer

int function myFunction(int, int)

Answer

myFunction int(int, int)

Question 33

What is the purpose of the 'using namespace std;' statement in C++ programs?

Accepted Answer

It allows you to use functions and objects from the standard library without specifying the 'std::' namespace.

Answer

It prevents you from using any functions or objects outside the 'std::' namespace.

Answer

It compiles the program using the latest C++ standard.

Answer

Its use is optional and does not affect the program's behavior.

Question 34

Which data type in C++ is used to represent characters?

Accepted Answer

char

Answer

int

Answer

string

Answer

boolean

Question 35

What is the primary purpose of a constructor in C++?

Accepted Answer

To initialize an object's data when it is created.

Answer

To destroy an object's data when it is deleted.

Answer

To define the interface of an object.

Answer

To provide access to an object's private members.

Question 36

What is the primary purpose of the 'auto' keyword in C++? Provide an example of its usage.

Accepted Answer

Automatically deduces the data type of a variable based on its initialization.

Answer

Declares variables as constants.

Answer

Defines functions in C++.

Answer

Is not a valid keyword in C++.

Question 37

In C++, explain the distinction between 'shallow copy' and 'deep copy' operations. Provide code examples to demonstrate the implementation of each copy type.

Accepted Answer

**Shallow Copy:** Creates a new object that references the same underlying data as the original object, implemented using a pointer reference.

**Deep Copy:** Creates a new, independent object with its own copy of the underlying data, ensuring changes to one object do not affect the other.

Answer

**Shallow Copy:** Creates a new, independent object with its own copy of the underlying data.

**Deep Copy:** Creates a new object that references the same underlying data as the original object.

Answer

Shallow and deep copies are identical in C++ and always result in independent objects.

Answer

Deep copies are not feasible in C++ because objects are only accessible through pointers.

Question 38

In C++, what is the purpose of the 'template' keyword? Provide an example to illustrate its use.

Accepted Answer

Allows creation of generic classes and functions that work with various data types, promoting code reusability.

Answer

Declares new data types in C++.

Answer

Limits functions to being called with specific data types.

Answer

Creates pointers to specific data types.

Question 39

Which of the following is a fundamental data type in C++?

Accepted Answer

int

Answer

str

Answer

boolean

Answer

array

Question 40

What is the primary purpose of a constructor in C++?

Accepted Answer

To initialize an object's data members upon creation

Answer

To manage the object's lifetime

Answer

To create a new instance of the object

Answer

To define the object's behavior

Question 41

Which of the following is an invalid control structure in C++?

Accepted Answer

for until

Answer

while

Answer

switch

Answer

for

Question 42

What is the primary function of a header file in C++?

Accepted Answer

To declare classes, functions, and other entities for use in multiple source files

Answer

To handle memory allocation

Answer

To store executable code

Answer

To manage input and output operations

Question 43

What is a key benefit of using namespaces in C++?

Accepted Answer

To prevent naming conflicts and organize code effectively

Answer

To enhance code readability

Answer

To support object-oriented programming

Answer

To improve code performance

Question 44

What is the purpose of the `this` pointer in C++?

Accepted Answer

To reference the current object

Answer

To access global variables

Answer

To store the address of the object