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ungetc
======

Syntax
------

     #include <stdio.h>
     
     int ungetc(int c, FILE *file);

Description
-----------

This function pushes C back into the FILE.  You can only push back one
character at a time.

Return Value
------------

The pushed-back character, or `EOF' on error.

Example
-------

     int q;
     while (q = getc(stdin) != 'q');
     ungetc(q);