#include <stdio.h>
#include <stdlib.h>

typedef struct SQueue{
    int * data;
    int front,rear;
    int maxSize;
} SQueue;

void initQueue(SQueue *queue, int size){
    queue->front=0;
    queue->rear=0;
    queue->maxSize=size;
    queue->data=(int*)malloc(size*sizeof(int));
}

void insertQueue(SQueue *queue, int data){
    int csize=queue->rear;
    if((csize+1)>queue->maxSize){
        printf("queue is full, can't insert element again!");
        return;
    }
    queue->data[queue->rear]=data;
    queue->rear=queue->rear+1;
}

int outQueue(SQueue *queue){
    int fIndex=queue->front;
    if((fIndex+1)>=queue->maxSize){
        printf("queue is empty, can't out element again!");
        return -1;
    }
    int data= queue->data[queue->front];
    queue->front=queue->front+1;
    return data;
}

int isEmpty(SQueue queue){
    if(queue.rear==queue.front){
        return 1;
    }
    return 0;
}

int main()
{
    SQueue queue;
    initQueue(&queue,3);
    insertQueue(&queue,1);
    insertQueue(&queue,2);
    insertQueue(&queue,3);
    insertQueue(&queue,4);
    int sd=isEmpty(queue);
    printf("queue is full=%d!\n",sd);
    int fdata=outQueue(&queue);
    printf("data=%d!\n",fdata);
    int wdata=outQueue(&queue);
    printf("data=%d!\n",wdata);
    return 0;
}