//链队列
#include <stdio.h>
#include <stdlib.h>
#define MAXSIZE 30
typedef struct node
{
char data;
struct node *next;
}QNode;
typedef struct
{
QNode *front, *rear; //头尾指针
}LQueue;
void Init_LQueue(LQueue **q)
{
QNode *p;
p = (QNode *)malloc(sizeof(QNode)); //申请队列的头节点
(*q) = (LQueue *)malloc(sizeof(LQueue)); //申请带头尾指针的节点
p->next = NULL;
(*q)->front = p;
(*q)->rear = p;
}
int Empty_LQueue(LQueue *q) //队列空
{
if (q->front == q->rear)
{
return 1;
}
else
{
return 0;
}
}
void In_LQueue(LQueue *q, char x)
{
QNode *p;
p = (QNode *)malloc(sizeof(QNode));
p->data = x;
p->next = NULL;
q->rear->next = p;
q->rear = p; //使队尾指针指向新的队尾节点*p
}
void Out_LQueue(LQueue *q, char *x) //出队
{
QNode *p;
if (Empty_LQueue(q))
{
printf("Empty!\n");
return ;
}
else
{
p = q->front->next; //p 指向第一个节点
*x = p->data;
q->front->next = p->next; //把第二个节点作为第一个节点
free(p);
if (q->front->next == NULL) //出队后队列为空
{
q->rear = q->front;
}
}
}
void Print(LQueue *q)
{
QNode *p;
p = q->front->next;
while (p != NULL)
{
printf("%4c", p->data);
p = p->next;
}
printf("\n");
}
int main()
{
LQueue *q;
char x, *y = &x;
Init_LQueue(&q);
if (Empty_LQueue(q))
{
printf("Empty!\n");
}
printf("Input any string:\n");
scanf("%c", &x);
while (x != '\n')
{
In_LQueue(q, x);
scanf("%c", &x);
}
printf("Output element of Queue:\n");
Print(q);
printf("Output Queue:\n");
Out_LQueue(q, y);
printf("Element of Output Queue is %c\n", *y);
Print(q);
return 0;
}
队列
最新推荐文章于 2018-02-26 14:59:35 发布