Queue using Array

/*******************************************************************************/
#include <stdio.h>
#include<stdlib.h>
#include <stdbool.h>
#define MAX 50
// initilazing queue
int queue[MAX];
int rear = - 1;
int front = 0;
// Function to check if the queue is empty
bool isEmpty() {
    return rear <front ;
}

// Function to check if the queue is full
bool isFull() {
    return rear == MAX - 1;
}

void insert() // enqueue
{
int item;
if (isFull())
  printf("Queue Overflow \n");
else
 {
 printf("\nInset the element in queue : ");
 scanf("%d", &item);
 rear = rear + 1;
 queue[rear] = item;
 }
} /*End of insert()*/
void delete() //dequeue
{
if (isEmpty() )
    {
    printf("\nQueue Underflow \n");
    return ;
    }
    else
    {
    printf("\nElement deleted from queue is : %d\n", queue[front]);
    front = front + 1;
}
} /*End of delete() */
void display()// print queue
{
int i;
    if (isEmpty() )
        printf("\nQueue is empty \n");
    else
    {
        printf("\nQueue is : ");
        for (i = front; i <= rear; i++)
            printf("%d ", queue[i]);
        printf("\n");
    }
}
// Function to peek at the front item
int peek() {
    if (isEmpty()) {
        printf("Queue is empty. Nothing to peek.\n");
        return -1; // Error value
    } else {
        return queue[front];
    }
}
// Function to get the size of the queue
int size() {
    if (isEmpty()) {
        return 0;
    } else {
        return rear - front + 1;
    }
}
int main()
{
int choice;
while (1)
{
printf("\n1.Insert element to queue \n");
printf("2.Delete element from queue \n");
printf("3.Display all elements of queue \n");
printf("4.Peek \n");
printf("5.Size of the queue\n");
printf("6.Quit \n");
printf("\nEnter your choice : ");
scanf("%d", &choice);
switch (choice)
{
case 1:
    insert();
    break;
case 2:
    delete();
    break;
case 3:
    display();
    break;
case 4:
    int x=peek();
    if(x!=-1) printf("\nfront element is=%d\n",x);
    break;
case 5:
    printf("\nsize of the queue is =%d\n",size());
    break;
case 6:
    exit(1);

default:

printf("\nWrong choice \n");

} /*End of switch*/

} /*End of while*/
return 0;
} /*End of main()*/

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