获取错误后需要帮助重置密码

Question

大家好我想知道在输入无效输入后我应该在何处以及如何重置密码。例如，用户在收到错误后输入正确的密码后，会使用正确的密码进行复制。因此，当用户放置＆＃34;空间＆＃34;在密码中，当错误触发时，它一直给我一个错误，即我的输入仍有空格，即使没有。enter code here

do 
{
    int i = 0;
    flag = true;

    cin.clear();                // reset the input stream 
    cout << "Enter your password\n";
    ch = _getch();

    while(ch != 13)
       {//character 13 is enter - carriage return
             pass += ch;
             cout << '*';
             ch = _getch();
       }         

       cout << "\nThe password you entered was " << pass << endl;

       cin.clear();             // reset the input stream 

    while (i < pass.length() && flag)
    {
        if (pass.at(i) == ' ')
        {
            cerr << "ERROR: PASSWORD CANNOT CONTAIN ANY SPACES!" << endl;
            flag = false;
        }
               i++;
    }   

        if (pass.length() < 5)
        {
            cerr << "ERROR: PASSWORD IS TOO SHORT!" << endl;
            flag = false;
        }
          cout << endl; 

} 

Answer 1

这会起作用：

string pass;
bool flag;
do
{
  flag = true;

  cout << "Enter your password\n";
  getline(cin, pass);

  cout << "Pass is " << pass << endl;

  unsigned int i=0;
  while (i < pass.length() && flag)
  {
    if (pass.at(i) == ' ')
    {
      cout << "ERROR: PASSWORD CANNOT CONTAIN ANY SPACES!" << endl;
      flag = false;
    }
    ++i;
  }   
}while(flag == false);