#include “stdio.h”
#include “malloc.h”
#define STACK_INIT_SIZE 20
#define STACKINCREMENT 10
typedef struct{
char *base;
char *top;
int stacksize;
}sqStack;
int initStack(sqStack *s)
{
/*内存中开辟一段连续空间作为栈空间,首地址赋值给s->base*/
s->base = (char *)malloc(STACK_INIT_SIZE * sizeof(char));
if(!s->base) return 0; /*分配空间失败*/
s->top = s->base; /*最开始,栈顶就是栈底*/
s->stacksize = STACK_INIT_SIZE; /*最大容量为STACK_INIT_SIZE */
return 1;
}
int Push(sqStack *s, char e){
if(s->top – s->base >= s->stacksize){
/*栈满,追加空间*/
s->base = (char *)realloc(s->base, (s->stacksize +
STACKINCREMENT)*sizeof(char));
if(!s->base) return 0; /*存储分配失败*/
s->top = s->base + s->stacksize;
s->stacksize = s->stacksize + STACKINCREMENT; /*设置栈的最大容量*/
}
*(s->top) = e; /*放入数据*/
s->top++;
return 1;
}
int Pop(sqStack *s , char *e){
if(s->top == s->base) return 0;
*e = *–(s->top);
return 1;
}
int match(char e,char c){ /*比较栈顶元素e和输入的括号字符c是否匹配*/
if(e=='(‘ && c==’)’)return 1;
if(e=='[‘ && c==’]’)return 1;
return 0;
}
void MatchBracket()
{
sqStack s;
char c , e ;
initStack( &s ); /*初始化一个空栈*/
scanf(“%c”,&c); /*输入第一个字符*/
while(c!=’#’){ /*’#’为输入的结束标志*/
if(s.top == s.base)
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*/
else
{
Pop(&s,&e); /*取出栈顶元素*/
if(match(e,c)!= 1){/*将输入的元素与取出的栈顶进行比较,如果匹配不成功*/
Push(&s,e); /*先将原栈顶元素重新入栈*/
Push(&s,c); /*再将输入的括号字符入栈*/
}
}
scanf(“%c”,&c); /*输入下一个字符*/
}
if(s.top == s.base) printf(“The brackets are matched\n”); /*如果栈s为空,则括号完全匹配*/
else printf(“The brackets are not matched\n”); /*如果栈s不为空,则括号不完全匹配*/
}
main()
{
printf(“Please input some brackets for determing whether match\n”);
MatchBracket();
getchar();
getchar();
}