#include <stdio.h>
#include <malloc.h>

typedef struct queue
{
    int * pbase;
    int rear;
    int front;

}QUEUE;

void init (QUEUE *);
void en_queue (QUEUE*,int);
void traverse (QUEUE*);
int main(void)
{
    QUEUE q;
    init (&q);
    en_queue (&q,1);
    en_queue (&q,2);
    en_queue (&q,3);
    en_queue (&q,4);
    en_queue (&q,5);
    en_queue (&q,6);
    traverse (&q);

    return 0;


}

void init (QUEUE * pq)
{
    pq->pbase = (int *)malloc(sizeof(int)*6);
    pq->front = 0;
    pq->rear = 0;
   
}

void en_queue (QUEUE* pq,int val)
{
    pq->pbase[pq->rear] = val;
    pq->rear = (pq->rear+1)%6;


}

void traverse (QUEUE* pq)
{
    int i;
      i = pq->front;
    while (i != pq->rear)
    {
        printf("%3d",pq->pbase[i]);
        i = (i+1)%6;
    }

    printf("\n");
}