链式队列

 1 #include <iostream>
 2 using namespace std;
 3 struct  squeue
 4 {
 5     int data;
 6     squeue *next;
 7 };
 8 struct link
 9 {
10     squeue* front;
11     squeue *rear;
12 };
13 void initqueue(link *S)        /*设定头节点，不存储数据*/
14 {
15     squeue *sq;
16     sq=new squeue;
17     S->front=S->rear=sq;
18     sq->next=NULL;
19 }
20 int isempty(link *S)
21 {
22     if(S->rear==S->front)
23         return 1;
24     return 0;
25 }
26 int enqueue(link *S,int e)
27 {
28     squeue *sq;
29     sq=new squeue;
30     sq->data=e;
31     sq->next=NULL;
32     S->rear->next=sq;
33     S->rear=sq;
34 }
35 int ouqueue(link *S,int &e)
36 {
37     if(isempty(S))
38         return 0;
39     else
40     {
41         squeue* p=S->front->next;
42         e=p->data;
43         S->front->next=p->next;
44     }
45 }
46 int main()
47 {
48     link q;
49     initqueue(&q);
50     int i,e;
51     for(i=0;i<5;i++)
52         enqueue(&q,i);
53     for(i=0;i<5;i++)
54     {
55         ouqueue(&q,e);
56         cout<<e<<' ';
57     }
58 }