include <stdio.h>

include <stdlib.h>

define MAX 10

define OK 0

define ERROR -1

typedef struct queue{
int Queue[MAX];
int front;
int rear;
}Queue;

Queue Init_Queue(Queue *Q){

Q->front = Q->rear = 0;
return *Q;

}
void Print(Queue Q){
while( Q.rear != Q.front){
printf("%d ", Q.Queue[Q.front]);
Q.front++;
}
printf("\n");
}
void CreadQueue(Queue Q, int n){
printf("请输入%d个元素：", n);
int i = 0;
while(i < n){
scanf("%d", &Q->Queue[i]);
Q->rear++;
i++;
}
Print(Q);
}

int QueueLength(Queue Q){
int i = 0;
while(Q.front != Q.rear){
Q.front++;
i++;
}
printf("length: %d\n", i);
return i;
}

int InsertQueue(Queue Q, int num){
if((Q->rear+1)%MAX == Q->front)
return ERROR;
Q->Queue[Q->rear] = num;
Q->rear = (Q->rear+1)%MAX;
Print(Q);
return OK;
}

int DeleQueue(Queue Q){
int num = 0;
if(Q->front == Q->rear)
return ERROR;
num = Q->Queue[Q->front];
Q->front = (Q->front+1)%MAX;
printf("首元素：%d\n", num);
printf("剩余元素：");
Print(Q);
return OK;
}
int Show(){
int n;
printf("******************\n");
printf("1、获取队列长度。\n");
printf("2、插入元素。\n");
printf("3、删除首元素。\n");
printf("4、退出。\n");
printf("-------------------\n");
printf("请选择要操作的序号：");
scanf("%d", &n);
return n;
}
int main()
{
Queue Q;
int num;

Init_Queue(&Q);
CreadQueue(&Q, 5);

int n;
n = Show();
while(n != 4){
       switch(n){
            case 1:
                QueueLength(Q);
                n = Show();
                break;
            case 2:
                printf("输入要插入的数字：");
                scanf("%d", &num);
                InsertQueue(&Q, num);
                n = Show();
                break;
            case 3:
                DeleQueue(&Q);
                n = Show();
                break;
            case 4:
                break;
        }
}
return 0;

}