Introduction to C++: A Comprehensive Guide for Beginners

Question 1

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

Accepted Answer

int

Answer

float

Answer

double

Answer

char

Question 2

What does the following operator in C++ do: *?

Accepted Answer

Multiplication

Answer

Addition

Answer

Concatenation

Answer

Division

Question 3

What will be printed by the following C++ statement: cout << 10 + 5;

Accepted Answer

15

Answer

5

Answer

10

Answer

10 5

Question 4

Which syntax is correct for declaring a variable of type integer named 'number' in C++?

Accepted Answer

int number;

Answer

number = int;

Answer

number int;

Answer

int = number;

Question 5

What is the purpose of the 'namespace' keyword in C++?

Accepted Answer

To group related functions and objects together

Answer

To define a new data type

Answer

To include external libraries

Answer

To handle exceptions

Question 6

Where is the entry point of a C++ program?

Accepted Answer

main function

Answer

start function

Answer

init function

Answer

run function

Question 7

Which of these code snippets is a valid way to create a loop in C++?

Accepted Answer

for (int i = 0; i < 10; i++)

Answer

goto 10;

Answer

continue 10;

Question 8

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

Accepted Answer

To avoid having to type "std::" before every standard library function

Answer

To create a new namespace

Answer

To include additional header files

Answer

To improve the performance of the program

Question 9

Which of the following operators is used to perform modulus division in C++?

Accepted Answer

%

Answer

/

Answer

*

Answer

+

Question 10

What type of loop is best suited for iterating through a linked list?

Accepted Answer

While loop

Answer

For loop

Answer

Do-while loop

Answer

For-each loop

Question 11

What is the role of the "main()" function in a C++ program?

Accepted Answer

It is the starting point of program execution

Answer

It handles input and output operations

Answer

It manages memory allocation

Answer

It contains the program's main logic

Question 12

What is the significance of the "virtual" keyword in C++?

Accepted Answer

It allows a function to be overridden in derived classes

Answer

It ensures that a function cannot be overridden in derived classes

Answer

It improves the performance of a function

Answer

It prevents a function from being called directly

Question 13

In C++, which of these options are valid access modifiers?

Accepted Answer

public

Accepted Answer

protected

Accepted Answer

private

Answer

open

Question 14

In C++, what is the primary purpose of the `const` keyword?

Accepted Answer

To declare a variable that cannot be changed

Answer

To indicate a variable that is only used in functions

Answer

To define a variable that can be accessed from anywhere in the program

Question 15

In C++, what is the main reason for using the `using namespace std;` statement?

Accepted Answer

To enable access to symbols from the `std` namespace without using the namespace prefix

Answer

To establish a new namespace called `std`

Answer

To avoid name conflicts between symbols from different namespaces

Answer

To establish a new program scope called `std`

Question 16

Templates in C++ are primarily used for:

Accepted Answer

Creating reusable code that works with different data types.

Answer

Managing memory allocation to prevent errors.

Answer

Defining complex data structures.

Question 17

In C++, what key difference sets references apart from pointers?

Accepted Answer

References must be initialized to a valid variable upon declaration.

Answer

References can be reassigned to a different variable.

Answer

References are more memory-efficient than pointers.

Answer

References can only be used with built-in data types.

Question 18

In C++, which syntax is correct for declaring a variable?

Accepted Answer

int variable;

Answer

variable int;

Answer

int =

Answer

int& variable;

Question 19

Which data type should be used to store a single character in C++?

Accepted Answer

char

Answer

int

Answer

float

Answer

string

Question 20

Which operator is used for assigning values in C++?

Accepted Answer

=

Answer

+

Answer

==

Answer

/

Question 21

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

Accepted Answer

Executing the program's instructions

Answer

Declaring global variables

Answer

Receiving input from the user

Answer

Handling errors

Question 22

In C++, which of the following is considered a valid identifier?

Accepted Answer

my_variable

Answer

123abc

Answer

abc%

Answer

variable name

Question 23

What will be the output of the following C++ code: cout << 10 + 5 * 2; ?

Accepted Answer

30

Answer

15

Answer

50

Answer

102

Question 24

Which header file should be included to enable input and output operations in C++?

Accepted Answer

Answer

Answer

Answer

<stdio>

Question 25

What is the primary purpose of the semicolon (;) in C++ statements?

Accepted Answer

Terminating statements

Answer

Separating statements

Answer

Declaring variables

Answer

Inputting values

Question 26

Which of the following is not a reserved keyword in C++?

Accepted Answer

myFunction

Answer

if

Answer

while

Answer

int

Question 27

In C++, which data type is used to store individual characters?

Accepted Answer

char

Answer

int

Answer

float

Answer

bool

Question 28

Which symbol is used to assign a value to a variable in C++?

Accepted Answer

=

Answer

+

Answer

-

Answer

*

Question 29

In C++, what is the main purpose of the code `int main()`?

Accepted Answer

Defines the program's entry point

Answer

Initializes all variables

Answer

Specifies the return type of the main function

Answer

Sets the return value of the program

Question 30

What will be the output of this C++ code: `cout << 5 + 3 * 2;`?

Accepted Answer

11

Answer

5

Answer

8

Answer

13

Question 31

In C++, what is the primary use of the `namespace` keyword?

Accepted Answer

Organizing and grouping related code elements

Answer

Defining new data types

Answer

Creating new scopes

Answer

Importing external libraries

Question 32

What is the purpose of the preprocessor directive `#include` in C++?

Accepted Answer

Including a header file

Answer

Defining new data types

Answer

Creating new functions

Answer

Importing a library

Question 33

What will be the output of the following C++ code: `int a = 5; cout << ++a;`?

Accepted Answer

6

Answer

5

Answer

7

Answer

8

Question 34

How do single-line and multi-line comments differ in C++?

Accepted Answer

Single-line comments use // and end at the line's end, while multi-line comments start with /* and end with */.

Answer

Multi-line comments use // and end at the line's end, while single-line comments start with /* and end with */.

Answer

Both types of comments start with // and end with */.

Answer

Both types of comments start with /* and end with //.

Question 35

In C++, which syntax is used to define a function?

Accepted Answer

void main() { }

Answer

int main(string args[]) { }

Answer

function main() { }

Answer

public static void main(String[] args) { }

Question 36

In C++, which symbol marks the beginning of a code block?

Accepted Answer

{

Answer

[]

Answer

()

Answer

<

Question 37

Which of the following is NOT a valid data type in C++?

Accepted Answer

Double-string

Answer

Boolean

Answer

String

Answer

Double

Question 38

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

Accepted Answer

Serves as the entry point of the program execution

Answer

Declares all global variables and functions

Answer

Handles user input and output exclusively

Answer

Contains the logic for the entire program

Question 39

Which operator is used to test equality between two variables in C++?

Accepted Answer

==

Answer

<>

Answer

=

Answer

!=

Question 40

What is the fundamental difference between a 'for' loop and a 'while' loop in C++?

Accepted Answer

A 'for' loop has a predetermined loop condition, while a 'while' loop continues until its condition becomes false

Answer

A 'for' loop is primarily used for counting, while a 'while' loop is employed for conditions

Question 41

Which function is used to read a single character from the standard input in C++?

Accepted Answer

getchar()

Answer

gets()

Answer

scanf()

Answer

cin()

Question 42

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

Accepted Answer

It grants access to standard library functions and objects without requiring the 'std::' prefix

Answer

It initializes the 'std' namespace

Answer

It establishes a new namespace

Question 43

What is the primary function of the 'const' keyword in C++?

Accepted Answer

It declares an immutable variable (constant)

Answer

It declares a pointer variable

Answer

It declares a reference variable

Question 44

Which of the following is NOT an advantage of C++ as a programming language?

Accepted Answer

Its execution speed is generally slower compared to other languages

Answer

It is highly portable across different platforms

Answer

It provides robust type checking

Answer

It embraces object-oriented programming principles

Question 45

In C++, which syntax correctly declares an integer variable named 'number'?

Accepted Answer

int number;

Answer

int = number;

Answer

int(number);

Answer

number = int;

Question 46

What is the data type of the variable 'pi' in the following C++ code: double pi = 3.14;

Accepted Answer

double

Answer

float

Answer

int

Answer

string

Question 47

Which C++ operator is used to perform addition?

Accepted Answer

+

Answer

%

Answer

/

Answer

*

Question 48

What will be the output of this C++ code: cout << (10 > 5);

Accepted Answer

true

Answer

false

Answer

5

Answer

10

Question 49

Which of the following is a valid keyword in C++?

Accepted Answer

for

Answer

ifelse

Answer

print

Answer

loop

Question 50

What is the purpose of the following C++ code: cin >> number;

Accepted Answer

Reads a value from the user and stores it in the 'number' variable.

Answer

Displays the 'number' variable on the screen.

Answer

Initializes the 'number' variable to zero.

Question 51

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

Accepted Answer

Header files contain declarations, while source files contain definitions.

Answer

Header files are compiled after source files.

Answer

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

Question 52

How do you correctly declare a function named 'myFunction' in C++ that takes two integer parameters, 'x' and 'y'?

Accepted Answer

int myFunction(int x, int y);

Answer

int x, int y) myFunction;

Answer

myFunction(int x, int y);

Answer

int myFunction int x, int y);

Question 53

Which syntax correctly defines a loop in C++?

Accepted Answer

for (int i = 0; i < 10; i++)

Answer

do while (i < 10);

Answer

until (i < 10)

Answer

while (i < 10)