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C++ Vector

This quiz tests your knowledge of C++ vector container and its associated operations. It contains 10 MCQs

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Question 1

Which of the following is the correct way to declare an empty vector of integers named my_vec?

vector<int> my_vec;
vector int my_vec;
int vector my_vec;
vector<int> my_vec[];

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Question 2

Predict the output of this program:

C++

#include <iostream> #include <vector> using namespace std;  int main() {     vector<int> v = {1, 2, 3};     cout << v.size() << " " << v.capacity();     return 0; }

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Question 3

What will the following code print?

C++

#include <iostream> #include <vector> using namespace std; int main() {     vector<int> v = {1, 2, 3, 4, 5};     v.resize(3);     cout << v.size() << " " << v[2];     return 0; }

5 3
Error
3 5
3 3

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Question 4

What will the following code print?

C++

#include <iostream> #include <vector> using namespace std; int main() {     vector<int> v = {1, 2, 3, 4, 5};     for (int x : v)         x = x + 2;              for (int x : v)         cout << x << " ";     return 0; }

1 2 3 4 5
2 4 6 8 10
2 4 5 6 7
Compiler Error

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Question 5

What will the following code print?

C++

#include <iostream> #include <vector> using namespace std; int main() {     vector<int> v = {1, 2, 3};     vector<int>::iterator it = v.begin();     cout << (it + 1);     return 0; }

Error
1
2
3

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Question 6

What will the following code print?

C++

#include <iostream> #include <vector> using namespace std; int main() {     vector<int> v1 = {1, 2, 3};     vector<int> v2;     v2 = v1;     v1[0] = 10;     cout << v2[0];     return 0; }

Error
3
2
1

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Question 7

What is the difference between v.size() and v.capacity()?

They are always equal.
size() is the number of elements, capacity() is the allocated storage.
size() is the allocated storage, capacity() is the number of elements.
They are unrelated.

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Question 8

How do you access the element at index 2 in a vector named my_vector?

my_vector.at(2)
my_vector[2]
my_vector(2)
None of the Above.

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Question 9

Which function is used to remove the last element from a vector?

remove_last()
delete_last()
pop_back()
erase_last()

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Question 10

What does the push_back() function do to a vector?

Adds an element to the end.
Adds an element to the beginning.
Removes the last element.
Inserts an element at a specific index.

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C++

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