循环队列练习

相关内容：
1.队列顺序存储的不足
2.循环队列（队列头尾相接的顺序存储结构）

//队列的初始化、入队、出队、取对头、计算队长度
#include<stdio.h>
#define MAXSIZE 10
typedef int Status;
#define OK 1
#define ERROR 0
typedef struct Queue
{int data[MAXSIZE];int front;//队头指针，指向队头元素int rear;//队尾指针，指向队尾元素的下一个位置
}SqQueue;
Status InitQueue(SqQueue *SQ){SQ->front=SQ->rear=0;return OK;
}
//入队操作限定在队尾进行
Status EnQueue(SqQueue *SQ,int e){if ((SQ->rear+1)%MAXSIZE==SQ->front)//判满return ERROR;SQ->data[SQ->rear]=e;//元素入队SQ->rear=(SQ->rear+1)%MAXSIZE;//后移队尾指针，若越界则重回队头return OK;
}
//出队操作限定在队头进行
Status DeQueue(SqQueue *SQ,int *e){if (SQ->front==SQ->rear)//判空return ERROR;*e=SQ->data[SQ->front];SQ->front=(SQ->front+1)%MAXSIZE;//后移队头指针，若越界则重回队头return OK;
}
int GetHead(SqQueue *SQ){if (SQ->front==SQ->rear)//判空return ERROR;return SQ->data[SQ->front];
}
int QueueLength(SqQueue *SQ){return (SQ->rear - SQ->front+MAXSIZE)%MAXSIZE;
}
int main(){int n,e;SqQueue SQ;InitQueue(&SQ);printf("Init Completed!\n");printf("输入入队元素个数:");scanf("%d",&n);for (size_t i = 0; i < n; i++){printf("输入第%d个入队元素:",i+1);scanf("%d",&e);EnQueue(&SQ,e);}printf("队头元素:%d\n",GetHead(&SQ));printf("当前队列长度:%d\n",QueueLength(&SQ));for (size_t i = 0; i < n; i++){printf("输出第%d个出队元素:",i+1);DeQueue(&SQ,&e);printf("%d\n",e);}return 0;
}