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Working with Data Structures: Queues

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2025/2026 Written for academic year
Institution Santiago Canyon College
Course CMPR 131
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A queue in data structures is a collection of elements that follows the First-In-First-Out (FIFO) principle, meaning that the first element added to the queue will be the first one to be removed. In C++, a queue can be implemented using the Standard Template Library (STL) with the `std::queue` class. Key operations associated with a queue include: 1. **Enqueue**: Adding an element to the back of the queue. 2. **Dequeue**: Removing an element from the front of the queue. 3. **Peek/Front**: Accessing the front element without removing it. 4. **IsEmpty**: Checking if the queue is empty. Queues are commonly used in scenarios like task scheduling, breadth-first search algorithms, and managing requests in systems.

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#include <iostream>
#include <string>
#include <queue>
using namespace std;

int main()
{
queue<double> doubleQueue;
string yesNoString;

doubleQueue.push(1.1);
doubleQueue.push(2.2);
doubleQueue.push(3.3);
doubleQueue.push(4.4);
doubleQueue.push(5.5);

doubleQueue.empty() == 1 ? yesNoString = "true" : yesNoString = "false";
cout << "EMPTY: " << yesNoString << endl;
cout << "SIZE: " << doubleQueue.size() << endl;
cout << "FRONT: " << doubleQueue.front() << endl;
cout << "BACK: " << doubleQueue.back() << endl;

doubleQueue.pop();
doubleQueue.pop();

doubleQueue.empty() == 1 ? yesNoString = "true" : yesNoString = "false";
cout << "EMPTY: " << yesNoString << endl;
cout << "SIZE: " << doubleQueue.size() << endl;
cout << "FRONT: " << doubleQueue.front() << endl;
cout << "BACK: " << doubleQueue.back() << endl;

doubleQueue.pop();
doubleQueue.pop();

doubleQueue.empty() == 1 ? yesNoString = "true" : yesNoString = "false";
cout << "EMPTY: " << yesNoString << endl;
cout << "SIZE: " << doubleQueue.size() << endl;
cout << "FRONT: " << doubleQueue.front() << endl;
cout << "BACK: " << doubleQueue.back() << endl;
}

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