circular queue

#include<stdio.h>
#include<conio.h>
#define n 5
int queue[n];
int front =-1;
int rear=-1;

// to perform the enqueue operation
void enqueue(int x){
if(front == -1 && rear == -1){
        front =rear = 0;
        queue[rear]=x;
}
else if((rear+1)%n == front){
    printf("\nThe circular queue is full.");
}
else {
    rear=(rear+1)%n;
    queue[rear]=x;
}
}

// to perform the dequeue operation
void deque(){
if(front == -1 && rear==-1){
    printf("\nUnderflow condition");
}
else if(front == rear){
    front = rear =-1;
}
else{
          printf("\nThe element deleted from the queue is %d",queue[front]);
    front =(front+1)%n;


}

}
// displaying the element of the queue
void display(){
int i =front;
if(front ==-1&&rear==-1){
    printf("\nThe circular queue is empty .");
}
else{
    while(i!=rear){
        printf("\n%d",queue[i]);
        i=(i+1)%n;
    }
    printf("\n%d",queue[rear]);
}
}

void main(){
    int choice;
    int item;
    char ans;
    do {
    printf("\n===============MAIN MENU======================");
    printf("\n1:ENQUEUE\n2:DEQUEUE\n3:DISPLAY");
    printf("\nEnter choice");
    scanf("%d",&choice);
    switch(choice){
case 1 :
    printf("\nAdding .........");
    printf("\nEnter the element to be inserted:");
    scanf("%d",&item);
    enqueue(item);
    break;
case 2:
    printf("\nDeleting.............");
    deque();
    break;
case 3:
    printf("\nDisplaying ..............");
    display();
    break;
default:
    printf("\nWrong selection ");
break;
    }
printf("\nDo you want to continue y/n:");
ans = getche();
}while(ans == 'y'||ans == 'Y');

}