Master C++ Standard Template Library (STL): Interactive Learning Quizzes

Question 1

In the Standard Template Library (STL) for C++, which container is used to store elements in a sequential order, allowing fast access and insertion at the end?

Accepted Answer

vector

Answer

map

Answer

set

Answer

queue

Question 2

What is the primary function of the 'find' algorithm in the STL?

Accepted Answer

Locates the first occurrence of a specified value within a container

Answer

Inserts a new element into a container

Answer

Sorts elements in a container in ascending order

Answer

Removes duplicate elements from a container

Question 3

Which STL container is designed to store key-value pairs, allowing efficient retrieval based on the key?

Accepted Answer

map

Answer

vector

Answer

set

Answer

deque

Question 4

What is the time complexity of the 'push_back' operation for adding an element to the end of a vector in the STL?

Accepted Answer

O(1)

Answer

O(n)

Answer

O(log n)

Answer

O(n^2)

Question 5

Which of the following is NOT an advantage of using the STL?

Accepted Answer

Increased code complexity

Answer

Code reusability

Answer

Reduced development time

Answer

Improved performance

Question 6

What is the key difference between a vector and an array in the STL?

Accepted Answer

Vectors can dynamically adjust their size, unlike arrays with fixed sizes.

Answer

Arrays can store different data types, while vectors can only store one type.

Answer

Vectors are more efficient for random access, while arrays are better for sequential access.

Answer

There is no difference between vectors and arrays in the STL.

Question 7

What is the purpose of a template in the STL?

Accepted Answer

To create generic containers and algorithms that can work with various data types.

Answer

To enhance code efficiency.

Answer

To reduce code duplication.

Answer

To increase code flexibility.

Question 8

Which STL iterator type allows you to traverse a container in reverse order?

Accepted Answer

reverse_iterator

Answer

forward_iterator

Answer

bidirectional_iterator

Answer

random_iterator

Question 9

What is the distinction between a const_iterator and a regular iterator in the STL?

Accepted Answer

A const_iterator prevents modification of container elements.

Answer

A regular iterator cannot be used to iterate in reverse order.

Answer

There is no difference between const_iterators and regular iterators.

Answer

A const_iterator can only be used with constant containers.

Question 10

What is the main advantage of using containers from the STL in C++?

Accepted Answer

Enhanced code efficiency

Answer

Increased code complexity

Answer

Reduced code reusability

Question 11

What is the purpose of the 'find' function in an STL container?

Accepted Answer

To locate the position of a specific element

Answer

To insert an element into the container

Answer

To delete an element from the container

Answer

To order the elements in the container

Question 12

With which STL container is the 'push_back' method primarily used?

Accepted Answer

Vector

Answer

Set

Answer

Map

Answer

Queue

Question 13

What is the key distinction between an 'unordered_map' and a 'map' in STL?

Accepted Answer

Unordered_map employs hashing for faster search

Answer

Map allows duplicate keys

Answer

Unordered_map is more memory-efficient

Answer

There is no difference

Question 14

What is the purpose of a 'const_iterator' in STL?

Accepted Answer

To traverse elements of a container without modifying them

Answer

To insert new elements into a container

Answer

To delete elements from a container

Answer

To sort a container

Question 15

Which STL algorithm is commonly used for sorting a vector?

Accepted Answer

sort

Answer

arrange

Answer

order

Answer

sequence

Question 16

What is the purpose of the 'reserve' method in a vector?

Accepted Answer

To allocate memory for a specified number of elements in advance

Answer

To reduce the vector's capacity

Answer

To insert an element at a specific index

Answer

To clear the vector

Question 17

Evaluate the advantages and disadvantages of the Standard Template Library (STL) in comparison to other prominent C++ standard libraries, such as Boost and Qt.

Accepted Answer

STL provides a more extensive selection of containers and algorithms than Boost.

Accepted Answer

Qt focuses on GUI development, while STL has a broader scope.

Accepted Answer

STL is an inherent component of the C++ standard library, unlike Boost and Qt.

Answer

Boost generally surpasses STL in operational speed.

Question 18

In the Standard Template Library (STL), what is the primary purpose of iterators?

Accepted Answer

Provide a standardized way to move through and access elements in containers

Answer

Store and manage data elements within containers

Answer

Compare the contents of different containers

Answer

Create new containers and manage their contents

Question 19

Which of the following is NOT a type of STL container?

Accepted Answer

Array

Answer

Vector

Answer

List

Answer

Map

Question 20

Which STL algorithm can be used to sort a vector in ascending order?

Accepted Answer

sort()

Answer

reverse()

Answer

find()

Answer

erase()

Question 21

What is the purpose of the 'iterator' concept in STL?

Accepted Answer

To provide a standardized way to traverse containers

Answer

To create new elements in a container

Answer

To compare two containers

Answer

To sort elements in a container

Question 22

Which STL container is best suited for storing unique elements in a specific order?

Accepted Answer

Set

Answer

Multiset

Answer

Map

Answer

Multimap

Question 23

Which of the following is a valid STL function for finding an element in a map?

Accepted Answer

find()

Answer

count()

Answer

erase()

Answer

insert()

Question 24

What is the time complexity of searching for an element in a balanced binary search tree (BST) that uses STL's 'map' container?

Accepted Answer

O(log n)

Answer

O(1)

Answer

O(n)

Answer

O(n^2)

Question 25

Which STL header file should be included to use the 'queue' container?

Accepted Answer

<queue>

Answer

<list>

Answer

<map>

Answer

Question 26

What is the difference between a 'deque' and a 'vector' in STL?

Accepted Answer

A deque can be accessed efficiently from both ends, while a vector can only be accessed from one end

Answer

A vector is a dynamic array, while a deque is a static array

Answer

A deque can hold different data types, while a vector can only hold one data type

Answer

There is no difference between a deque and a vector

Question 27

Which STL container should be used to store elements in an ordered sequence, allowing efficient access and insertion/deletion operations at any position?

Accepted Answer

vector

Answer

list

Answer

map

Answer

set

Question 28

What is the primary purpose of the 'find' function in the STL algorithm library?

Accepted Answer

To locate the first occurrence of a specified element within a container

Answer

To sort a container in ascending or descending order

Answer

To remove all occurrences of a specified element from a container

Answer

To concatenate two containers into a single container

Question 29

Which STL iterator type allows traversal of a container in reverse order, from the last element to the first?

Accepted Answer

reverse_iterator

Answer

forward_iterator

Answer

input_iterator

Answer

output_iterator

Question 30

Which member function is not available in the STL 'vector' container?

Accepted Answer

reverse

Answer

push_back

Answer

pop_back

Answer

erase

Question 31

What is the time complexity of appending an element to the end of a vector in STL?

Accepted Answer

Constant (O(1))

Answer

Linear (O(n))

Answer

Logarithmic (O(log n))

Answer

Quadratic (O(n^2))

Question 32

Which STL container is most suitable for efficiently storing and retrieving data using key-value pairs?

Accepted Answer

map

Answer

vector

Answer

list

Answer

set

Question 33

What is the key distinction between a 'weak_ptr' and a 'shared_ptr' in STL?

Accepted Answer

Weak pointers can point to deleted objects, while shared pointers cannot

Answer

Weak pointers can be null but shared pointers cannot

Answer

Shared pointers can be null but weak pointers cannot

Answer

Shared pointers can point to deleted objects, while weak pointers cannot

Question 34

Which STL algorithm can be used to determine the element with the highest value in a container?

Accepted Answer

max_element

Answer

min_element

Answer

sort

Answer

reverse

Question 35

What is the primary role of the 'template' keyword in the context of STL?

Accepted Answer

To enable the creation of generic functions and classes that operate on various data types

Answer

To enhance code readability and clarity

Answer

To prevent runtime errors

Answer

To optimize code performance and efficiency

Question 36

Which of the following is a **disadvantage** of using STL algorithms?

Accepted Answer

Platform dependency

Answer

Reusability

Answer

Efficiency

Answer

Portability

Question 37

Which STL component provides a standardized method to access and manipulate elements in different data structures, irrespective of their implementation details?

Accepted Answer

Iterators

Answer

Algorithms

Answer

Containers

Answer

Functors

Question 38

Which function in STL is used to sort a vector in descending order?

Accepted Answer

std::sort(v.begin(), v.end(), std::greater<int>())

Answer

std::sort(v.rbegin(), v.rend())

Answer

std::reverse(v.begin(), v.end())

Answer

std::sort(v.end(), v.begin())

Question 39

Which class in STL provides functionality for reading and writing binary data?

Accepted Answer

fstream

Answer

ifstream

Answer

ofstream

Answer

file

Question 40

What is the purpose of a pair in STL?

Accepted Answer

To store two related values

Answer

To represent a point in a coordinate system

Answer

To implement a queue

Answer

To create a hash table

Question 41

Which STL container should be used to efficiently store a large number of integers?

Accepted Answer

Vector

Answer

List

Answer

Set

Answer

deque

Question 42

Which function in STL is used to check if a given number is prime?

Accepted Answer

std::is_prime()

Answer

std::isPrime()

Answer

std::findPrime()

Answer

std::prime()

Question 43

What is the difference between a copy constructor and an assignment operator in STL?

Accepted Answer

A copy constructor creates a new object, while an assignment operator modifies an existing object

Answer

A copy constructor can be used to initialize an object, while an assignment operator cannot

Answer

An assignment operator can be used to modify an object's value, while a copy constructor cannot

Answer

A copy constructor and an assignment operator are the same thing

Question 44

Which technique is used by the STL implementation of vectors to store elements contiguously in memory?

Accepted Answer

Dynamic arrays

Answer

Linked lists

Answer

Virtual memory

Answer

Hash tables

Question 45

How do STL containers simplify memory management in C++ programs?

Accepted Answer

STL containers automatically handle memory allocation and deallocation.

Answer

STL containers require manual memory management using pointers.

Answer

STL containers only store basic data types, so memory management is not an issue.

Answer

Memory management in STL containers varies depending on the container type.

Question 46

What is the main benefit of using the STL in C++?

Accepted Answer

Increased code efficiency

Answer

Enhanced code readability

Answer

Reduced memory consumption

Question 47

How does STL utilize object-oriented principles to enhance its design?

Accepted Answer

STL employs polymorphism to manage objects of various types within its containers and inheritance to establish a hierarchy of containers with specialized behaviors, promoting flexibility and code reusability.

Answer

STL primarily relies on arrays and pointers for data management, with minimal use of object-oriented principles.

Answer

Polymorphism in STL is primarily used to implement generic algorithms, while inheritance is employed to define relationships between data types.

Question 48

Which of the following is a container adapter in the STL that provides a queue-like interface?

Accepted Answer

queue

Answer

map

Answer

vector

Answer

set

Question 49

Identify the STL algorithm used to determine the minimum element within a specified range of a container:

Accepted Answer

min_element

Answer

max_element

Answer

find

Answer

sort

Question 50

In the STL, an 'iterator' is best described as a:

Accepted Answer

pointer-like object

Answer

data structure

Answer

function object

Answer

container

Question 51

Which STL container is designed to store key-value pairs, enabling efficient retrieval based on keys?

Accepted Answer

map

Answer

list

Answer

vector

Answer

queue

Question 52

Identify the STL algorithm responsible for sorting elements in a container in ascending order:

Accepted Answer

sort

Answer

max

Answer

reverse

Answer

find

Question 53

Which STL container is characterized by its ability to store unique, sorted elements, avoiding duplicates?

Accepted Answer

set

Answer

list

Answer

vector

Answer

map

Question 54

The 'swap' function in STL primarily serves to:

Accepted Answer

exchange the contents of two containers

Answer

merge two containers

Answer

sort a container

Answer

find an element in a container

Question 55

Which STL algorithm is employed to efficiently search for a specific element within a sorted container?

Accepted Answer

binary_search

Answer

find

Answer

linear_search

Answer

sort

Question 56

The 'vector' class in STL can be described as a:

Accepted Answer

dynamically resizable array

Answer

tree

Answer

linked list

Answer

hash table

Question 57

Identify the STL algorithm used to apply a user-defined transformation to each element of a container, producing a new container:

Accepted Answer

transform

Answer

find

Answer

max

Answer

sort