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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _ungetch function pushes the character <c> back to the
     console, causing <c> to be the next character read by _getch or
     _getche. The _ungetch function fails if it is called more than
     once before the next read. The <c> argument cannot be EOF.
 
     Return Value
 
     The _ungetch function returns the character <c> if it is
     successful. A return value of EOF indicates an error.
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