括号匹配 C语言 简单实现

#include <stdio.h> 
#include<malloc.h>

typedef struct bracket 
{
 char c; 
 struct bracket *next; 
}BRACKET; 
BRACKET *top=NULL; 

BRACKET *pushstack(BRACKET *top,char c) 
{
 BRACKET *p=(BRACKET*)malloc(sizeof(struct bracket)); 
 p->c=c; 
 if(top==NULL) 
 {
  p->next=NULL; 
  top=p;
 } 
 else 
 {
  p->next=top; 
  top=p; 
 } 
 printf("%cÈëÕµ\n",top->c); 
 return top; 
} 
BRACKET *popstack(BRACKET *top) 
{
 BRACKET *p;