C++ Queue

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Question 1

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

C++ 
#include <iostream>
#include <queue>
using namespace std;

int main()
{
    queue<int> myqueue;
    myqueue.push(80);
    myqueue.push(70);
    myqueue.push(60);
    myqueue.push(50);

    if (myqueue.front() > myqueue.back()) {
        cout << myqueue.front() - myqueue.back();
    }
    else if (myqueue.front() < myqueue.back()) {
        cout << myqueue.back() - myqueue.front();
    }
    else
        cout << "0";
}

  • 50

  • 70

  • 30

  • 130

Question 2

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

C++ 
#include <iostream>
#include <queue>
using namespace std;

int main()
{
    queue<int> myqueue;
    myqueue.push(30);
    myqueue.push(40);
    myqueue.push(10);
    myqueue.push(50);

    cout << myqueue.back();
    return 0;
}

  • 30

  • 40

  • 10

  • 50

Question 3

Which of the following statements about the queue container is false?

  • It is a first-in, first-out (FIFO) data structure.

  • It has a front and a back, but no random access to elements.

  • It has a fixed size.

  • It is implemented as a dynamic array.

Question 4

Which of the following is/are not a valid way to initialize a queue in C++?

  • queue<int> q;

  • queue<int> q(5);

  • queue<int> q({1, 2, 3});

  • queue<int> q(q2);

Question 5

Which of the following is not a member function of the queue STL in C++?

  • empty()

  • size()

  • get()

  • push()

Question 6

What is the main property of a queue?

  • LIFO (last in, first out)

  • FIFO (first in, first out)

  • Both a and b

  • None of the above

Question 7

Which of the following is not a member function of the queue STL in C++?

  • pop()

  • push()

  • front()

  • insert()

Question 8

Can the queue STL in C++ be used to store elements of different data types?

  • Yes

  • No

Question 9

What is the complexity of the size() member function of the queue STL in C++?

  • O(1)

  • O(n)

  • O(log n)

  • O(n log n)

Question 10

Can the queue STL in C++ be used to store elements of a user-defined data type?

  • Yes

  • No

Tags:
C++

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