- How can I find out whether a character has been typed, without waiting for one?

Date: 5 Feb 2002 22:03:03 -0400

 In Turbo Pascal, use KeyPressed. Both Microsoft C and Turbo C offer the
 kbhit() function. All of these tell you whether a key has been pressed.
 If no key has been pressed, they return that information to your
 program. If a keystroke is waiting, they tell your program that but
 leave the key in the input buffer.

 You can use the BIOS call, INT 16 AH=01 or 11, to check whether an
 actual keystroke is waiting; or the DOS call, INT 21 AH=0B, to check for
 a keystroke from stdin (subject to redirection). See Ralf Brown's
 interrupt list <Q:02.03> [What and where is Ralf Brown's interrupt
 list?].

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