1: #include <stdio.h>
2: #include <stdlib.h>
3: #define STACK_INIT_SIZE 20
4: #define STACKINCREMENT 10
5:
6: typedef char ElemType; /*将char类型定义为ElemType*/
7:
8: typedef struct{ /*定义一个栈类型*/
9: ElemType *base;
10: ElemType *top;
11: int stacksize;
12: }sqStack;
13:
14:
15: void initStack(sqStack *s)
16: {
17: /*内存中开辟一段连续空间作为栈空间,首地址赋值给s->base*/
18: s->base = (ElemType *)malloc(STACK_INIT_SIZE * sizeof(ElemType));
19: if(!s->base) exit(0); /*分配空间失败*/
20: s->top = s->base; /*最开始,栈顶就是栈底*/
21: s->stacksize = STACK_INIT_SIZE; /*最大容量为STACK_INIT_SIZE */
22: }
23:
24: void Push(sqStack *s, ElemType e){ /*入栈操作*/
25: if(s->top - s->base >= s->stacksize){
26: /*栈满,追加空间*/
27: s->base = (ElemType *)realloc(s->base, (s->stacksize +
28: STACKINCREMENT)*sizeof(ElemType));
29: if(!s->base) exit(0); /*存储分配失败*/
30: s->top = s->base + s->stacksize;
31: s->stacksize = s->stacksize + STACKINCREMENT; /*设置栈的最大容量*/
32: }
33: *(s->top) = e; /*放入数据*/
34: s->top++;
35: }
36:
37: void Pop(sqStack *s , ElemType *e){ /*出栈操作*/
38: if(s->top == s->base) return; /*将栈顶元素弹出*/
39: *e = *--(s->top); /*修改栈顶指针*/
40: }
41:
42: int StackLen(sqStack s){ /*获得栈s的大小*/
43: return (s.top - s.base) ;
44: }
45:
46:
47: int match(char e,char c){
48: if(e=='(' && c==')')return 1;
49: if(e=='[' && c==']')return 1;
50: return 0;
51: }
52:
53: int main()
54: {
55: sqStack s;
56: char c , e ;
57: initStack( &s ) ; /*初始化一个空栈*/
58: scanf("%c",&c); /*输入第一个字符*/
59: while(c!='#'){ /*'#'为输入的结束标志*/
60: if(!StackLen(s))
61: Push(&s,c); /*如果栈为空,则说明输入的是第一个字符,因此保存在栈中*/
62: else
63: {
64: Pop(&s,&e); /*取出栈顶元素*/
65: if(!match(e,c)){ /*将输入的元素与取出的栈顶进行比较,如果匹配不成功*/
66: Push(&s,e); /*先将原栈顶元素重新入栈*/
67: Push(&s,c); /*再将输入的括号字符入栈*/
68: }
69: }
70: scanf("%c",&c); /*输入下一个字符*/
71: }
72: if(!StackLen(s)) printf("The brackets are matched\n"); /*如果栈s为空,则括号完全匹配*/
73: else printf("The brackets are not matched\n"); /*如果栈s不为空,则括号不完全匹配*/
74: return 0;
75:
76: }
77: