How to use toupper()

[Ray Butterworth]

In article <23156 at watmath.waterloo.edu>, rbutterworth at watmath.waterloo.edu (Ray Butterworth) writes:
> Drop that requirement and say that they are only defined to work on
> values that can be returned by getchar().

Hmm.  That's not quite what I meant to say.

The functions should be well defined for for all (int) input,
with the restriction that except for EOF only the low order byte
of the int will be examined.  The values returned will be those
that can be returned by getchar().