# ungetc(3)

## NAME

         ungetc - push character back into input stream

## SYNOPSIS

         #include <stdio.h>

         int ungetc(int c, FILE *stream)

## DESCRIPTION

         Ungetc pushes the character c back on an input  stream.   That  character
         will be returned by the next getc call on that stream.  Ungetc returns c.

         One character of pushback is guaranteed provided something has been  read
         from  the  stream  and the stream is actually buffered.  Attempts to push
         EOF are rejected.

         Fseek(3) erases all memory of pushed back characters.

## SEE ALSO

         getc(3), setbuf(3), fseek(3).

## DIAGNOSTICS

         Ungetc returns EOF if it can't push a character back.