fgetc doubts

[Gábor Kövesdán]

James Bailie escribió:
> fgetc() returns an int so that EOF may be distinguished from valid
> return values.  Valid values are 8-bit values.  EOF is a 32-bit value.
>
> EOF is a 32-bit two's-complement -1 (0xffffffff), and -1 input is 8-bit
> two's-complement -1 (0xff).  When fgetc() casts this to an int, it
> becomes 0x000000ff, or 255, and thus the two values may be distinguished
> from each other.
>
> I haven't looked at your code, but you are probably comparing EOF with
> the value returned by fgetc() after it has been cast to a char.  EOF is
> getting cast to a char implicitly in the comparison, so the comparison
> becomes a comparison between 0xff and 0xff.  You need to test the int
> returned by fgetc() for EOF before assigning it to a char.
Thanks, I've found all the pieces of the puzzle from the three comments 
and it works now.

-- 
Gabor Kovesdan
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