70.lambda表达式逻辑(二进制转换为为十进制)

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

 void main()
 {
     auto fun = [](char *str)->int
     {
         int res = ;
         char *p = str;
         int length = strlen(str);
         for (int i = ; i < length; i++)
         {
             res *= ;
             res += str[i] - '';
         }
         return res;
     };

     char str[];
     cin >> str;
     cout << fun(str) << endl;
     system("pause");
 }