C++ STL Deque Aptitude Questions and Answers

1) There are the following statements that are given below, which of them are correct about deque container in C++?

1. The deque stands for the double-ended queue.
2. The deque is a sequence container.
3. The deque is a derived container.
4. In the deque container, data can be inserted and deleted from both the front and back ends the side.

Options:

1. A and B
2. A, C, and D
3. A, B, and D
4. C and D

2) Which of the following header file is required to use deque container in C++?

1. <queue>
2. <deque>
3. <dqueue>
4. <cqueue>

3) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.add(10);
    d.add(20);
    d.add(30);

    for (int i = 0; i < d.size(); i++) {
        cout << d[i] << " ";
    }

    return 0;
}

Options:

1. 10 20 30
2. Garbage Value
3. Syntax error
4. Runtime error

4) What is the correct output of the given code snippets?

#include <iostream>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_back(20);
    d.push_back(30);

    for (int i = 0; i < d.size(); i++) {
        cout << d[i] << " ";
    }

    return 0;
}

Options:

1. 10 20 30
2. Garbage Value
3. Syntax error
4. Runtime error

5) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_front(20);
    d.push_back(30);

    for (int i = 0; i < d.size(); i++) {
        cout << d[i] << " ";
    }

    return 0;
}

Options:

1. 10 20 30
2. 20 10 30
3. 30 10 20
4. Syntax error

6) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_front(20);
    d.pop_back();
    d.push_back(40);

    for (int i = 0; i < d.size(); i++) {
        cout << d[i] << " ";
    }

    return 0;
}

Options:

1. 10 20 40
2. 10 40
3. 20 40
4. Syntax error

7) What is the correct output of given code snippets in C++?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_back(20);
    d.push_back(30);

    d.insert(40);

    for (int i = 0; i < d.size(); i++) {
        cout << d[i] << " ";
    }

    return 0;
}

Options:

1. 10 20 30 40
2. 10 20 40
3. 10 30 40
4. Syntax error

8) What is the correct output of given code snippets in C++?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_back(20);
    d.push_back(30);

    deque<int>::iterator itr = d.begin();
    ++itr;

    d.insert(itr, 40);

    for (int i = 0; i < d.size(); i++) {
        cout << d[i] << " ";
    }

    return 0;
}

Options:

1. 10 20 30 40
2. 10 40 20 30
3. 10 30 40 20
4. Syntax error

9) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_back(20);
    d.push_back(30);

    deque<int>::iterator itr = d.begin();
    itr++;

    d.insert(itr, 2, 40);

    for (int i = 0; i < d.size(); i++) {
        cout << d[i] << " ";
    }

    return 0;
}

Options:

1. 10 20 30 40
2. 10 40 40 20 30
3. 10 2 40 20 30
4. Syntax error

10) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_back(20);
    d.push_back(30);

    deque<int>::iterator itr = d.end();
    itr++;

    d.insert(itr, 40);

    for (int i = 0; i < d.size(); i++) {
        cout << d[i] << " ";
    }

    return 0;
}

Options:

1. 10 20 30 30
2. 10 20 40 30
3. Garbage value
4. Syntax error

11) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_front(20);
    d.push_back(30);
    d.push_back(40);

    cout << d.at(4);

    return 0;
}

Options:

1. 40
2. Garbage value
3. Runtime error
4. Syntax error

12) What is the correct output of given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_front(20);
    d.push_back(30);
    d.push_back(40);

    cout << d.at(2);

    return 0;
}

Options:

1. 20
2. 30
3. 40
4. Syntax error

13) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_front(20);
    d.push_back(30);
    d.push_back(40);

    int* p = d.at(1, 3);

    for (int i = 0; i < p.size(); i++)
        cout << p[i] << " ";

    return 0;
}

Options:

1. 10 20 30 40
2. 20 30 40
3. Garbage value
4. Syntax error

14) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_front(20);
    d.push_back(30);
    d.push_back(40);

    cout << d.front();

    return 0;
}

Options:

1. 10
2. 20
3. 40
4. Syntax error

15) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_front(20);
    d.push_back(30);
    d.push_back(40);

    deque<int>::reverse_iterator ptr;
    for (ptr = d.rbegin(); ptr != d.rend(); ++ptr) {
        cout << *ptr << " ";
    }

    return 0;
}

Options:

1. 10 20 30 40
2. 40 30 20 10
3. 40 30 10 20
4. Syntax error

16) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_front(20);
    d.push_back(30);
    d.push_back(40);

    deque<int>::iterator ptr;
    for (ptr = d.rbegin(); ptr != d.rend(); ++ptr) {
        cout << *ptr << " ";
    }

    return 0;
}

Options:

1. 10 20 30 40
2. 20 10 30 40
3. 40 30 10 20
4. Syntax error

17) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d1;

    deque<int> d2;

    d2.push_back(10);
    d2.push_back(20);
    d2.push_back(30);

    d2.operator=(d1);

    for (int i = 0; i < d2.size(); i++)
        cout << d2[i] << " ";

    return 0;
}

Options:

1. 10 20 30
2. Garbage value
3. No output
4. Syntax error

18) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d1;

    deque<int> d2;

    d2.push_back(10);
    d2.push_back(20);
    d2.push_back(30);

    d1.operator=(d2);

    for (int i = 0; i < d1.size(); i++)
        cout << d1[i] << " ";

    return 0;
}

Options:

1. 10 20 30
2. Garbage value
3. No output
4. Syntax error

19) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d1;

    deque<int> d2;

    d2.push_back(10);
    d2.push_back(20);
    d2.push_back(30);

    d1.operator= d2;

    for (int i = 0; i < d1.size(); i++)
        cout << d1[i] << " ";

    return 0;
}

Options:

1. 10 20 30
2. Garbage value
3. No output
4. Syntax error

20) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_back(20);
    d.push_back(30);

    cout << d.back();

    return 0;
}

Options:

1. 10
2. 30
3. Garbage value
4. Syntax error

21) What is the correct output of the given code snippets?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_back(20);
    d.push_back(30);

    for (int i = 0; i < d.size(); i++)
        cout << d.operator[i] << " ";

    return 0;
}

Options:

1. 10 20 30
2. Garbage value
3. Syntax error
4. Runtime error

22) What is the correct output of given code snippets in C++?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_back(20);
    d.push_back(30);

    for (int i = 0; i < d.size(); i++)
        cout << d.operator[](i) << " ";

    return 0;
}

Options:

1. 10 20 30
2. Garbage value
3. Syntax error
4. Runtime error

23) What is the correct output of given code snippets in C++?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_back(20);
    d.push_back(30);

    for (int i = 0; i < d.size(); i++)
        cout << d.operator[]((i)) << " ";

    return 0;
}

Options:

1. 10 20 30
2. Garbage value
3. Syntax error
4. Runtime error

24) What is the correct output of given code snippets in C++?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_back(20);
    d.push_back(30);

    cout << d.operator[](3) << " ";

    return 0;
}

Options:

1. 0
2. Garbage value
3. Syntax error
4. Runtime error

25) What is the correct output of given code snippets in C++?

#include <iostream>
#include <deque>
using namespace std;

int main()
{
    deque<int> d;

    d.push_back(10);
    d.push_back(20);
    d.push_back(30);

    cout << d.operator<>(1) << " ";

    return 0;
}

Options:

1. 10
2. 20
3. Syntax error
4. Runtime error