DSA Lab 14 Program

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Program for implementing circular queue.

#include <stdio.h>
#define MAX_SIZE 5

int queue[MAX_SIZE];
int front = -1, rear = -1;

void enqueue(int data) {
    if ((rear + 1) % MAX_SIZE == front) {
        printf("Queue overflow\n");
        return;
    }
    if (front == -1) {
        front = 0;
    }
    rear = (rear + 1) % MAX_SIZE;
    queue[rear] = data;
    printf("Element %d inserted\n", data);
}
int dequeue() {
    if (front == -1) {
        printf("Queue underflow\n");
        return -1;
    }
    int data = queue[front];
    if (front == rear) {
        front = rear = -1;
    } else {
        front = (front + 1) % MAX_SIZE;
    }
    return data;
}
void display() {
    if (front == -1) {
        printf("Queue is empty\n");
        return;
    }
    printf("Queue elements: ");
    int i = front;
    while (i != rear) {
        printf("%d ", queue[i]);
        i = (i + 1) % MAX_SIZE;
    }
    printf("%d\n", queue[rear]);
}
int main() {
    enqueue(10);
    enqueue(20);
    enqueue(30);
    display();
    printf("Dequeued element: %d\n", dequeue());
    display();
    return 0;
}

# Output Element 10 inserted Element 20 inserted Element 30 inserted Queue elements: 10 20 30 Dequeued element: 10 Queue elements: 20 30

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