在cin.clear之后，getline没有获得某些字符

Question

// Validation and entry for ticket price
void ValidateTicketPrice ( double &ticket_price ){

   string error_string;

   cin >> ticket_price;
   while(1)
   {
      if(cin.fail())
      {
         cin.clear();
         getline ( cin, error_string);
         cout << error_string << " is not a valid ticket price. Please re-enter the data: ";
         cin >> ticket_price;
      } else {
         Flush();
         break;
      }
   }

}

Answer 1

试试这个：

一直读完整行。然后尝试将该行转换为字符串。如果它转换，返回。否则再试一次。

void ValidateTicketPrice ( double &ticket_price ){

   std::string input;

   while(std::getline (std::cin, input))
   {
       char * endp;

       ticket_price = strtod(input.c_str(), &endp);
       if (*endp == '\0')
       { // number conversion and input ended at same place. Whole input consumed.
           return;
       }
       else
       { // number and strign did not end at the same place. bad input.
           std::cout << input << " is not a valid ticket price. Please re-enter the data: ";
       }
   }
}