CIRCULAR QUEUE USING ARRAY

#include <stdio.h>
#include <conio.h>
#define SIZE 5

void enQueue(int);
void deQueue();
void display();

int cQueue[SIZE], front = -1, rear = -1;

void main()
{
    int choice, value;
    clrscr();
    while (1)
    {
        printf("\n****** MENU ******\n");
        printf("1. Insert\n2. Delete\n3. Display\n4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        switch (choice)
        {
        case 1:
            printf("\nEnter the value to be insert:  ");
            scanf("%d", &value);
            enQueue(value);
            break;
        case 2:
            deQueue();
            break;
        case 3:
            display();
            break;
        case 4:
            exit(0);
        default:
            printf("\nPlease select the correct choice!!!\n");
        }
    }
}
void enQueue(int value)
{
    if ((front == 0 && rear == SIZE - 1) || (front == rear + 1))
        printf("\nCircular Queue is Full! Insertion not possible!!!\n");
    else
    {
        if (rear == SIZE - 1 && front != 0)
            rear = -1;
        cQueue[++rear] = value;
        printf("\nInsertion Success!!!\n");
        if (front == -1)
            front = 0;
    }
}
void deQueue()
{
    if (front == -1 && rear == -1)
        printf("\nCircular Queue is Empty! Deletion is not possible!!!\n");
    else
    {
        printf("\nDeleted element : %d\n", cQueue[front++]);
        if (front == SIZE)
            front = 0;
        if (front - 1 == rear)
            front = rear = -1;
    }
}
void display()
{
    if (front == -1)
        printf("\nCircular Queue is Empty!!!\n");
    else
    {
        int i = front;
        printf("\nCircular Queue Elements are : \n");
        if (front <= rear)
        {
            while (i <= rear)
                printf("%d\t", cQueue[i++]);
        }
        else
        {
            while (i <= SIZE - 1)
                printf("%d\t", cQueue[i++]);
            i = 0;
            while (i <= rear)
                printf("%d\t", cQueue[i++]);
        }
    }
}