Understanding Queue Data Structures in C++

Can you explain what a queue data structure is in C++?

A queue is a linear data structure that follows the First In First Out (FIFO) principle. In C++, it can be implemented using arrays or linked lists.

What are some common applications of queues?

Queues are commonly used in scenarios like scheduling tasks, managing requests in servers, and handling asynchronous data.

How do I implement a queue using C++?

You can implement a queue using a class that contains an array or a linked list, along with methods for enqueue, dequeue, and checking if the queue is empty.

Can you show me a simple code example?

Sure! Here's a basic implementation using an array:

class Queue {
private:
    int front, rear, size;
    int* queue;
public:
    Queue(int s) {
        size = s;
        front = rear = 0;
        queue = new int[s];
    }
    void enqueue(int value) {
        if (rear < size) {
            queue[rear++] = value;
        }
    }
    int dequeue() {
        if (front < rear) {
            return queue[front++];
        }
        return -1; // Queue is empty
    }
};

This is a simple queue implementation.