Queue implementation Using Array

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 #include<conio.h>
#include<stdlib.h>
#include<stdio.h>
void enqueue(int a[], int *f, int *r, int *size)
{
    int data,choice=1;
    while(choice==1){
    if(*f==-1 && *r==-1)
    {
        *f=0;*r=0;
        printf("enter the value to be inserted: ");
        scanf("%d",&data);
        a[*r]=data;
    }
    else if(*r==*size-1)
    {
        printf("queue is full\n");
        break;
    }
    else
    {
        *r+=1;
        printf("enter the value to be inserted: ");
        scanf("%d",&data);
        a[*r]=data;
    }
    printf("want another element to be inserted(0,1): ");
    scanf("%d",&choice);
    }
}

void dequeue(int a[], int *f, int *r)
{
int choice=1;
while(choice==1)
  {
    if(*f==-1 && *r==-1)
    {
        printf("Queue is empty");
        break;
    }
    else if(*f==*r)
    {
        printf("Deleted element is: %d\n\nAnd Queue is now EMPTY\n",a[*f]);
        *r=-1;*f=-1;
        break;
    }
    else
    {
        printf("deleted element if %d\n",a[*f]);
        *f+=1;
    }
    printf("Do you want another element to be deleted(0,1): ");
    scanf("%d",&choice);
  }
}

void display(int a[], int f, int r)
{
    int i;
    if(f==-1 &&  r==-1)
    printf("Queue is empty");
    else
    {
     printf("queue is:\n");
     for(i=f;i<=r;i++)
     printf("%d\n",a[i]);
    }
}

void peek(int a[], int f, int r)
{
if(f==-1 && r==-1)
    printf("Queue is empty");
else
    printf("The element at front end is: %d\n",a[f]);
}

int main()
{
    int frnt=-1, rear=-1,n,ch,choice=1;
    printf("enter the size of queue: ");
    scanf("%d",&n);
    int queue[n];
    while(choice==1){
    printf("\nEnter 1. to enqueue(insert in queue) \n");
    printf("Enter 2. to dequeue (to delete from queue)\n");
    printf("Enter 3. to display \n");
    printf("Enter 4. to peek (to show the element at front) \n choice: ");
    scanf("%d",&ch);
    if(ch==1)
        enqueue(queue, &frnt, &rear, &n);
    else if(ch==2)
        dequeue(queue, &frnt, &rear);
    else if(ch==3)
        display(queue, frnt, rear);
    else if(ch==4)
        peek(queue, frnt, rear);
    else
        printf("invalid choice:");
    printf("\nDo you want to continue(0,1): ");
    scanf("%d",&choice);
    }
}

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