Keyboard input/Flush the keyboard buffer

Keyboard input/Flush the keyboard buffer
You are encouraged to solve this task according to the task description, using any language you may know.

Flush the keyboard buffer. This reads characters from the keyboard input and discards them until there are no more currently buffered, and then allows the program to continue. The program must not wait for users to type anything.

Ada

<lang Ada>with Ada.Text_IO; procedure Flushtest is begin

  Ada.Text_IO.Put_Line ("Type anything for 2 s");
  Delay 2.0;
  Flush_Input : declare
     Ch : Character;
     More : Boolean;
  begin
     loop
        Ada.Text_IO.Get_Immediate (Ch, More);
        exit when not More;
     end loop;
  end Flush_Input;
  Ada.Text_IO.Put_Line ("Okay, thanks. Here some input from you:");
  Ada.Text_IO.Put_Line (Ada.Text_IO.Get_Line);

end Flushtest;</lang>

BASIC

ZX Spectrum Basic

<lang basic>10 IF INKEY$ <> "" THEN GO TO 10</lang>

C

<lang C>#include <stdlib.h>

1. include <stdio.h>

int main(void) {

(void) fflush(stdin);
return EXIT_SUCCESS;

}</lang>

PicoLisp

<lang PicoLisp>(while (key 10))</lang>

PowerShell

The following uses the special $Host variable which points to an instance of the PowerShell host application. Since the host's capabilities may vary this may not wok in all PowerShell hosts. In particular, this works in the console host, but not in the PowerShell ISE. <lang powershell>while ($Host.UI.RawUI.KeyAvailable) {

   $Host.UI.RawUI.ReadKey() | Out-Null

}</lang>

PureBasic

<lang PureBasic>While Inkey(): Wend</lang>

Tcl

<lang tcl># No waiting for input fconfigure stdin -blocking 0

1. Drain the data by not saving it anywhere

read stdin

1. Flip back into blocking mode (if necessary)

fconfigure stdin -blocking 1</lang>