Posted on 2011-10-30 13:16
susu 阅读(316)
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1
2
3
4#include <stdio.h>
5#include <malloc.h>
6#define MAX 100
7char exp[MAX];
8
9
10struct qnode
11
{
12
char data;
13 struct qnode *next;
14
};
15
16typedef struct queue
17{
18 struct qnode *front;
19 struct qnode *rear;
20}linkqueue;
21
22
23void initqueue(linkqueue **q)
24{
25 struct queue *s;
26 s = (struct queue *)malloc(sizeof(struct queue));
27 s->front = s->rear = NULL;
28 *q = s;
29}
30/**//* */
31void enter(linkqueue **q, char x)
32{
33 struct qnode *s;
34 linkqueue *q_tmp;
35 q_tmp = *q;
36 s = (struct qnode *)malloc(sizeof(struct qnode));
37 s->data = x;
38 s->next = NULL;
39 if (q_tmp->front == NULL)
40
{
41 q_tmp->front = q_tmp->rear = s;
42
}
43 else
44 {
45 q_tmp->rear->next = s;
46 q_tmp->rear =s;
47 }
48 //*q = q_tmp;
49}
50
51
52void deleted(linkqueue **q)
53{
54 linkqueue *t;
55 struct qnode *tmp;
56 t = *q;
57 if (t->front == NULL) //队为空的时候
58 {
59 printf("队列为空！\n");
60 }
61 else if (t->front == t->rear) //队只有节点的时候
62 {
63 //t = t->front;
64 //t = t->front->next;
65 tmp = t->front;
66 t->front = t->rear;
67 }
68 else
69 {
70 tmp = t->front;
71 t->front = t->front->next;
72 }
73 free(tmp);
74}
75
76
77char gethead(linkqueue **q)
78{
79 linkqueue *s;
80 s = *q;
81 if (s->front == s->rear)
82 {
83 printf("队列为空!\n");
84 return 0;
85 }
86 else
87 {
88 return (s->front->data);
89 }
90}
91
92int empty(linkqueue **q)
93{
94 linkqueue *s;
95 s = *q;
96
97 if (s->front == s->rear) return 1;
98 else return 0;
99}
100
101void display(linkqueue **q)
102{
103 linkqueue *s;
104 struct qnode *p;
105 s = *q;
106 p = s->front;
107 printf("队列元素:\n");
108 while (p != NULL)
109 {
110 printf("%c :", p->data);
111 p = p->next;
112 }
113 printf("\n");
114}
115
116void main()
117{
118 char c;
119 linkqueue *qu;
120 printf("初始化队列qu \n");
121 initqueue(&qu);
122 printf("队列空：%d\n", empty(&qu));
123 printf("依次入队a, b, c, d 元素\n");
124 enter(&qu, 'a');
125 //printf("%c\n", qu->rear->data);
126 enter(&qu, 'b');
127 //printf("%c\n", qu->rear->data);
128 enter(&qu, 'c');
129 //printf("%c\n", qu->rear->data);
130 enter(&qu, 'd');
131 enter(&qu, 'e');
132 enter(&qu, 'f');
133 enter(&qu, 'g');
134 enter(&qu, 'h');
135 enter(&qu, 'i');
136 enter(&qu, 'j');
137 enter(&qu, 'k');
138 //printf("%c\n", qu->rear->data);
139 display(&qu);
140 c = gethead(&qu);
141 printf("%c\n", c);
142 deleted(&qu);
143 display(&qu);
144 c = gethead(&qu);
145 printf("%c\n", c);
146}
147