C++，利用链式栈实现括号匹配，界面友好，操作方便，运行流畅

#include<iostream>
 #include<string>
 using namespace std; 

struct Node
 {
  char ch;
  Node* next;
  Node(char c, Node* p){ ch = c; next = p; }
 }; 

void main()
 {
  string str;
  bool flag = true;
  while (flag)
  {
   cout << "请输入算术表达式：" << endl;
   getline(cin, str);
   int len = str.length();
   Node* top = NULL;
   int i;
   for (i = 0; i < len; i++)
   {
    if (str[i] == ‘(‘ || str[i] == ‘[‘ || str[i] == ‘{‘)
    {
     top = new Node(str[i], top);
    }
    if (str[i] == ‘)‘ || str[i] == ‘]‘ || str[i] == ‘}‘)
    {
     if (top == NULL){ cout << "1.括号不匹配！" << endl; break; }
     else
     {
      Node* pt = top;
      top = top->next;
      pt->next = NULL;
      char item = pt->ch;
      delete pt;
      if ((item == ‘(‘&&str[i] != ‘)‘) || (item == ‘[‘&&str[i] != ‘]‘) || (item == ‘{‘&&str[i] != ‘}‘))
      {
       cout << "2.括号不匹配！" << endl; break;
      }
     }
    }
   }
   if (i == len)
   {
    if (top){ cout << "3.括号不匹配！" << endl; }
    else cout << "括号完全匹配！" << endl;
   }
   if (top)
   {
    Node* ptr;
    while (top)
    {
     ptr = top->next;
     delete top;
     top = ptr;
    }
   }
   cout << "是否继续？继续请按1，退出请按0：" << endl;
   int choice;
   cin >> choice;
   getchar();
   if (choice == 0)flag = false;
  }
 } 

代码已经过测试，在VS2013上成功运行！ 

发此文有两大目的： 

1.和大家交流经验，供需要的人参考。 

2.在下菜鸟，代码中难免有不妥之处，恳求大神批评指正。您的批评就是在下提高的起点，对于您的批评，在下将不胜感激！