Defining a New Container - C++ Questions and Answers

This section on C++ language interview questions and answers focuses on “Defining a New Container”. One shall practice these interview questions to improve their C++ programming skills needed for various interviews (campus interviews, walkin interviews, company interviews), placements, entrance exams and other competitive exams. These questions can be attempted by anyone focusing on learning C++ programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our C++ language interview questions come with detailed explanation of the answers which helps in better understanding of C++ concepts.

Here is a listing of C++ language interview questions on “Defining a New Container” along with answers, explanations and/or solutions:

1. What do all STL containers define?
a) Iterator types
b) Begin methods
c) End methods
d) All of the mentioned
View Answer

Answer: d
Explanation: All the STL containers define the iterator types for that container, e.g., iterator and const_iterator, e.g., vector::iterator and the begin/end methods for that container, e.g., begin() and end().

2. What do we return if we use simple array on a internal container?
a) Methods
b) Pointers
c) Objects
d) Values
View Answer

Answer: b
Explanation: Pointers are legal iterators, so if your internal container is a simple C array, then all you need to do is return the pointers.

3. What is mandatory for designing a new container?
a) Classes
b) Iterators
c) Container
d) Variables
View Answer

Answer: b
Explanation: Iterators are used to increase the generality of an algorithm. Otherwise, we need to define the algorithm for each types.

4. What are the design requirements for building a container from the sratch?
a) Container interface requirements
b) Allocator interface requirements
c) Iterator requirements
d) All of the mentioned
View Answer

Answer: d
Explanation: These are the design specific requirements for building a container from the scratch.

5. How many iterators are needed for the defining a new container?
a) 1
b) 2
c) 3
d) 4
View Answer

Answer: c
Explanation: There are three main iterators needed for designing a container. They are const iterator, Reverse iterator and Iterator traits.

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6. What is the use of the allocator interface in the user-defined container?
a) Storage management
b) Memory management
c) Storage & Memory management
d) Iterator management
View Answer

Answer: a
Explanation: Storage management is the use of the allocator interface in the user-defined container.

7. How many types of container classes are there in c++?
a) 1
b) 2
c) 3
d) As many as possible
View Answer

Answer: b
Explanation: There are two type of container classes in c++. They are value containers and reference containers.

8. What is the name of the container which contains group of multiple objects?
a) Heterogeneous container
b) Homogeneous container
c) Both Homogeneous & Heterogeneous container
d) Sequence container
View Answer

Answer: a
Explanation: Heterogeneous container is the name of the container which contains group of multiple objects.

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

```
    #include <iostream>
```
```
    #include <string>
```
```
    #include <algorithm>
```
```
    using namespace std;
```
```
    int main() 
```
```
    {
```
```
        string s = "spaces in text";
```

        s.erase(remove(s.begin(), s.end(), ' ' ), s.end() ) ;

```
        cout << s << endl;
```
```
    }
```

a) spaces
b) spaces in
c) spaces in text
d) spacesintext
View Answer

Answer: d
Explanation: In this program, We formed a algorithm to remove spaces in the string.
Output:

$ g++ dan.cpp
$ a.out
spacesintext

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

```
    #include <vector> 
```
```
    #include <algorithm>
```
```
    #include <iostream>
```
```
    #include <iterator>
```
```
    using namespace std;
```
```
    int square(int i) { return i * i; }
```
```
    int main()
```
```
    {
```
```
        vector<int> V, V2;
```
```
        V.push_back(0);
```
```
        V.push_back(1);
```
```
        V.push_back(2);
```

        transform(V.begin(), V.end(), back_inserter(V2), square);

        copy(V2.begin(), V2.end(), ostream_iterator<int>(cout, " "));

```
        cout << endl;
```
```
    }
```

a) 0
b) 1
c) 2
d) 0 1 4
View Answer

Answer: d
Explanation: In this program, We formed an algorithm to find the square of the given number.
Output:

$ g++ dan1.cpp
$ a.out
0 1 4

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