實(shí)例代碼展示C語(yǔ)言中循環(huán)隊(duì)列的實(shí)現(xiàn)

#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));//這里注意和鏈不同，開(kāi)辟的是整片的數(shù)據(jù)空間，以base為基址
 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) //如果尾指針下一個(gè)是頭指針，即將其看成滿隊(duì)列（少利用一個(gè)空間）。否則只看頭指針等于尾指針會(huì)有歧義。
 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
");
}