C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
_kbhit
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <conio.h>
 
  Syntax:    int _kbhit( void );
 
  Returns:   a nonzero value if a key has been pressed, or 0 if not.
 
  See also:  _getch
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