C++ 用 cin 做 while 循环

Question

下面是我用 cin 做的 while 循环 有一点问题，当用户输入全名然后按回车键时。 指针将转到下一行。 直到用户再次按下回车，然后它提示电子邮件地址，我如何在下面的代码中输入全名后立即提示电子邮件地址

终端外观:

Full Name: John
Email Address: some_email@gmail.com

我的test.cpp代码:

emailAddress= "";
fullname = "";
counter = 0;

if(department_selection!="")
{

while(fullname=="")
{
if(counter>0)
{
//so it wont print twice
cout << "Full Name: ";
}

getline(cin,fullname);
cin.clear();
cin.ignore();
counter++;
}

counter = 0;

while(emailAddress=="")
{
if(counter>0)
{
//so it wont print twice
cout << "Email Address: ";
}

getline(cin,emailAddress);
cin.clear();
cin.ignore();
counter++;
}

}// if department selection not blank

还是一样的问题。我需要按一次 Tab Enter，然后它会提示输入电子邮件地址。

最新更新:设法修复它。我修改了代码，是这个版本:

do
{
  if(counter==0)
  {
     //so it wont print twice
     cout << "Full Name: ";
  }
  if(counter>1)
  {
     //so it wont print twice
     cout << "Full Name: ";
  }

  getline(cin,fullname);
  counter++;
} while (fullname=="");

counter = 0;

do
{
  if(counter==0)
  {
     //so it wont print twice
     cout << "Email Address: ";
  }
  if(counter>1)
    {
         cout << "Email Address: ";
    }

  getline(cin,emailAddress);
  counter++;
} while (emailAddress=="");

Answer 1

代替 if(counter>0) 使用 if(counter==0)

我的工作测试应用:

int counter = 0;
string fullname, emailAddress;
do
{
  if(counter==0)
  {
     //so it wont print twice
     cout << "Full Name: ";
  }

  getline(cin,fullname);
  counter++;
} while (fullname=="");

counter = 0;

do
{
  if(counter==0)
  {
     //so it wont print twice
     cout << "Email Address: ";
  }

  getline(cin,emailAddress);
  counter++;
} while (emailAddress=="");