C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
ungetc
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <stdio.h>
 
  Syntax:    int ungetc( int c, FILE *stream );
 
  Returns:   the character argument <c> if successful, or EOF if not.
 
  See also:  getc, fgetc, putc
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