Queue using Linked List

/*******************************************************************************/
#include<stdio.h>

#include<conio.h>
#include <stdlib.h>
struct Node
{
 int data;
 struct Node *next;
}*front=NULL,*rear=NULL;
void enqueue()
{
 struct Node *newnode=(struct Node*)malloc(sizeof(struct Node));
 printf("Enter data:");
 scanf("%d",&newnode->data);
 newnode->next=NULL;
 if(front==NULL)
 {
  front=newnode;
  rear=newnode;
 }
 else
 {
  rear->next=newnode;
  rear=newnode;
 }
}
int dequeue()
{
    if (front==NULL)
       {printf("Queue is empty...underflow");return -1;}
    else
    {
     struct Node *temp;
     temp=front;
     int rv=front->data;
     front=front->next;
     if(front==NULL) rear=NULL;
     free(temp);
     return(rv);
    }
}
void displayQ()
{
 struct Node *temp=front;
 while(temp!=NULL)
 {
  printf(" %d---->",temp->data);
  temp=temp->next;
 }
 printf(" NULL");
}
void main()
{
 int ch;
 
 do
 {
  printf("\nMenu\n----\n1.Enqueue\n2.Dequeue\n3.Display\n4.Exit");
  printf("\nEnter the choice:");
  scanf("%d",&ch);
  switch(ch)
  {
   case 1:
        enqueue();
        displayQ();
         break;
   case 2:
        int data;
        data=dequeue();
        if(data!=-1)
            printf("The dequed data is:%d\n",data);
        displayQ();
        break;
   case 3:
    displayQ();
    break;
   case 4:
    exit(0);
   default:
    printf("There is no such operation:");
  }
 }
 while(1);
}

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