C语言实现循环队列

#include<stdio.h>
#include<stdlib.h>
#define MAXQUEUE 100
typedef struct
{
 int *base;
 int front;
 int rear;
}SqQueue, *Sqqueue;
 
Sqqueue Creat(Sqqueue q);
void Enqueue(Sqqueue q, int e);
void Dequeue(Sqqueue q, int *e);
void Traverse(Sqqueue q);
 
int main()
{
 SqQueue q;
 int e;
 Sqqueue p = Creat(&q);
 Traverse(p);
 Dequeue(p, &e);
 Traverse(p);
 printf("the number that was deleted is :%d", e);
 return 0;
}
 
Sqqueue Creat(Sqqueue q)
{
 Sqqueue p = q;
 p->base = (int *)malloc(MAXQUEUE * sizeof(int));//这里注意和链不同，开辟的是整片的数据空间，以base为基址
 p->front = p->rear = 0;             
 for (int i = 1; i < 10; i++)
 Enqueue(p, i);
 return p;
}
void Enqueue(Sqqueue q, int e)
{
 if ((q->rear + 1) % MAXQUEUE == q->front) //如果尾指针下一个是头指针，即将其看成满队列（少利用一个空间）。否则只看头指针等于尾指针会有歧义。
 exit(1);
 q->base[q->rear] = e;
 q->rear = (q->rear + 1) % MAXQUEUE;
 
}
void Dequeue(Sqqueue q, int *e)
{
 if (q->front == q->rear)
 exit(1);
 (*e) = q->base[q->front];
 q->front = (q->front + 1) % MAXQUEUE;
}
void Traverse(Sqqueue q)
{
 for (int i = q->front; q->rear != i; i = (i + 1) % MAXQUEUE)
 printf("%d->", q->base[i]);
 printf("NULL\n");
}