#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！