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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _kbhit function checks the console for a recent keystroke. If
     the function returns a nonzero value, a keystroke is waiting in
     the buffer. The program can then call _getch or _getche to get the
     keystroke.
 
     Return Value
 
     The _kbhit function returns a nonzero value if a key has been
     pressed. Otherwise, it returns 0.
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