CPP Online Quiz or C++ Online Quiz, CPP MCQ Quiz and Online Test

1 .

What is meant by vector in the container library contains?

A)

It is a sequence container that encapsulates dynamic size arrays

B)

It manages the memory

C)

It manages the length and size

D)

It is a sequence container that encapsulates static size arrays

Correct Answer : Option (A) : It is a sequence container that encapsulates dynamic size arrays

Explanation : Vector in the container library contains sequence container that manipulates and encapsulates dynamic size arrays.

2 .

What will be the output of the following C++ code?

    #include <iostream>
    #include <vector>
    using namespace std;
    int main()
    {
        vector<int> v;
        v.assign( 10, 42 );
        for (int i = 0; i < v.size(); i++) 
        {
            cout << v[i] << " ";
        }
    }

A)

42

B)

42 42

C)

424

D)

42 for 10 times

Correct Answer : Option (D) : 42 for 10 times

Explaination :

In this program, We used the vector to print the 42 for 10 times.

Output :

$ g++ std.cpp
$ a.out
42 42 42 42 42 42 42 42 42 42

3 .

Which interface in the container is required for storage management?

A)

Memory interface

B)

Storage interface

C)

Allocator interface

D)

Memory management

Correct Answer : Option (C) : Allocator interface

Explanation : Allocator interface in the container is required for storage management.

4 .

In which type of storage location are the vector members stored?

A)

Memory storage locations

B)

Contiguous storage locations

C)

Non-contiguous storage locations

D)

Contiguous & Non-contiguous storage locations

Correct Answer : Option (B) : Contiguous storage locations

Explanation : Vectors use contiguous storage locations for their elements, which means that their elements can also be accessed using offsets on regular pointers to its elements

5 .

How the list containers are implemented?

A)

Using Single & Double linked list

B)

Using Single linked list

C)

Using linear linked list

D)

Using Double linked list

Correct Answer : Option (D) : Using Double linked list

Explanation : List containers are implemented as doubly-linked lists. Doubly linked lists can store each of the elements they contain in different and unrelated storage locations.

6 .

Which container can have the same keys?

A)

multimap

B)

map

C)

set

D)

unordered map

Correct Answer : Option (A) : multimap

Explanation : C++ provide multimap container that is used to make map that can contain same keys i.e. {a: 5} and {a:10} both can exist.

7 .

What do container adapter provide to interface?

A)

Memory interface

B)

Restricted interface

C)

More interface

D)

No interface

Correct Answer : Option (B) : Restricted interface

Explanation : A container adapter provides a restricted interface to a container.In particular, adapters do not provide iterators; they are intended to be used only through their specialized interfaces.

8 .

What do associate containers implement?

A)

Arrays

B)

Static arrays

C)

Associative arrays

D)

Functional Arrays

Correct Answer : Option (C) : Associative arrays

Explanation : Associative containers refer to a group of class templates in the standard library of the C++ programming language that implements ordered associative arrays.

9 .

What do maps and sets support?

A)

functional iterators

B)

Single directional iterators

C)

Bi-directional iterators

D)

Single & Bi-directional directional iterators

Correct Answer : Option (C) : Bi-directional iterators

Explanation : Bi-directional iterator are used to move in both direction from any element i.e. both forward and backward movements are allowed.

10 .

What kind of library is Standard Template Library?

A)

Generic

B)

Polymorphic

C)

Virtual

D)

Both Polymorphic & Generic

Correct Answer : Option (A) : Generic

Explanation : The STL is a generic library, meaning that its components are heavily parameterized.