การเพิ่มข้อมูลใน Queue (Enqueue) ด้วยภาษา C

Queue Insert Operation (Enqueue) แบบ Array

เน้นเฉพาะการ Insert และ Display ไม่มี Delete

โค้ด C

#include <stdio.h>
#define MAX 50

void insert();
int array[MAX];
int rear = -1;
int front = -1;

main() {
    int choice;
    while (1) {
        printf("1.Insert element to queue \n");
        printf("2.Display elements of queue \n");
        printf("3.Quit \n");
        printf("Enter your choice : ");
        scanf("%d", &choice);
        switch (choice) {
            case 1: insert(); break;
            case 2: display(); break;
            case 3: exit(1);
            default: printf("Wrong choice \n");
        }
    }
}

void insert() {
    int add_item;
    if (rear == MAX - 1)
        printf("Queue Overflow \n");
    else {
        if (front == -1) front = 0;
        printf("Inset the element in queue : ");
        scanf("%d", &add_item);
        rear = rear + 1;
        array[rear] = add_item;
    }
}

void display() {
    int i;
    if (front == -1)
        printf("Queue is empty \n");
    else {
        printf("Queue is : \n");
        for (i = front; i <= rear; i++)
            printf("%d ", array[i]);
        printf("\n");
    }
}

ตัวอย่าง Output

1.Insert element to queue
2.Display elements of queue
3.Quit
Enter your choice: 1
Inset the element in queue: 34
Enter your choice: 1
Inset the element in queue: 24
Enter your choice: 2
Queue is: 34 24
Enter your choice: 3