頭文件

 1 typedef int ElementType;
 2 
 3 #ifndef _STACKLI_H_
 4 #define _STACKLI_H_
 5 
 6 struct Node;
 7 typedef Node *PtrToNode;
 8 typedef PtrToNode Stack;
 9 
10 int IsEmpty(Stack S);
11 Stack CreateStack(void);
12 void DisposeStack(Stack S);
13 void MakeEmpty(Stack S);
14 void Push(ElementType X, Stack S);
 
15 ElementType Top(Stack S);
16 void Pop(Stack S);
17 
18 #endif

源文件

 1 #include "stackli.h"
 2 #include <malloc.h>
 3 #include <stdlib.h>
 4 
 5 struct Node
 6 {
 7     ElementType Element;
 8     PtrToNode Next;
 9 };
10 
11 int IsEmpty(Stack S)
12 {
13     return
 
 S->Next == NULL;
14 }
15 
16 // 創建棧的頭節點
17 Stack CreateStack(void)
18 {
19     Stack S = (Stack)malloc( sizeof(struct Node) );
20     if( S == NULL )
21     {
22         fprintf(stderr, "%s\n", "Out of space!!!");
23         exit(-1);
24     }
25     S->Next = NULL;
26     return S;
 
27 }
28 
29 // 銷毀棧(包括頭節點)
30 void DisposeStack(Stack S)
31 {
32     MakeEmpty(S);
33     free(S);
34 }
35 
36 // 清空棧就是彈出所有數據
37 void MakeEmpty(Stack S)
38 {
39     if(S == NULL)
40     {
41         fprintf(stderr, "%s\n", "Must use CreateStack first");
42         exit(-1);
43     }
44     else
45         while( !IsEmpty(S) )
46             Pop(S);
47 }
48 
49 // 進棧, 插入到頭節點之後
50 void Push(ElementType X, Stack S)
51 {
52     PtrToNode TmpCell = (PtrToNode)malloc( sizeof(struct Node) );
53     if(TmpCell == NULL)
54     {
55         fprintf(stderr, "%s\n", "Out of space!!!");
56         exit(-1);
57     }
58     else
59     {
60         TmpCell->Element = X;
61         TmpCell->Next = S->Next;
62         S->Next = TmpCell;
63     }
64 }
65 
66 // 返回棧頂元素, 註意S不能為空
67 ElementType Top(Stack S)
68 {
69     if( IsEmpty(S) )
70     {
71         fprintf(stderr, "%s\n", "Empty stack");
72         return -1;
73     }
74     else
75         return S->Next->Element;
76 }
77 
78 // 出棧, 刪除頭節點的後繼
79 void Pop(Stack S)
80 {
81     if( IsEmpty(S) )
82     {
83         fprintf(stderr, "%s\n", "Empty stack");
84     }
85     else
86     {
87         PtrToNode P = S->Next;
88         S->Next = P->Next;
89         free(P);
90     }
91 }

測試文件

 1 #include <stdio.h>
 2 #include "stackli.h"
 3 
 4 main( )
 5 {
 6     Stack S;
 7     int i;
 8 
 9     S = CreateStack( );
10     for( i = 0; i < 10; i++ )
11         Push( i, S );
12 
13     while( !IsEmpty( S ) )
14     {
15         printf( "%d ", Top( S ) );
16         Pop( S );
17     }
18 
19     DisposeStack( S );
20     return 0;
21 }

[數據結構與算法] : 棧的鏈式實現