switch default without "goto"

[Zeikko]

How should I use default case on switch without goto? I mean, if user's input is invalid, and I want user to type input again, how should I do that? Previously I used goto xxx; -statements, but everyone keeps saying that goto -statements are bad programming.

[packetpirate]

Use a while statement...

[Disch]

do
{
  get_user_input();
}while( user_input_is_not_valid );