C Program to implement Queue

/*C Program to implement Queue*/

include<conio.h>
#include<stdio.h>
#define max 5
int queue[max],front=0,rear=0;
int menu();
void enqueue();
void dequeue();
void display();
void main()
{
int ch;
clrscr();
printf("\nProgrammingUnit.com - Free Source Codes\n");
printf("\nQueues using Arrays\n");
do
{
    ch=menu();
    switch(ch)
    {
    case 1: enqueue();
    break;
    case 2: dequeue();
    break;
    case 3: display();
    break;
    case 4: exit();
    break;
    default:printf("\n Please enter a valid choice!!");
    }
}while(1);
}

int menu()
    {
    int ch;
    printf("\n1.ENQUEUE \n2.DEQUEUE \n3.DISPLAY \n4.EXIT");
    printf("\nEnter your Choice:");
    scanf("%d",&ch);
    return ch;
    }

void enqueue()
{
    int element;
    if(rear==max)
    {
        printf("\nOverflow!!");
    }
    else
    {
        printf("\nEnter Element:");
        scanf("%d",&element);
        queue[rear++]=element;
        printf("\n %d Enqueued at %d",element,rear);
    }

}

void dequeue()
{
    if(rear==front)
    {
        printf("\nUnderflow!!");
    }
    else
    {
        front++;
        printf("\nElement is Dequeued from %d",front);
    }
}
void display()
{
    int i;
    if(front==rear)
    {
        printf("\nQueue is Empty!!!");
    }
    else
    {
        printf(" \n");
        for(i=front;i<max;i++)
        {
            printf(" | %d ",queue[i]);
        }
            printf("|");
    }
}

----------------------------------------------------------
OUTPUT:-

sk.

sk.