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egcs question

Some code that I'm trying to put into a port, always gives this message:

warning: comparison is always true due to limited range of data type

The code is, slightly extracted:
    static inline void Cerr(char ch)
        cerr << (char) (ch > 0 && ch < 0x00C0 ? ch : ' ');

Now the datatype "char" should range from 0 to 0xff, so it ought
not be the case that the comparison
	(ch>0 && ch<0xC0)
is always true.  Is the leading 0x00 confusing it? Or am I missing
something obvious due to lack of sleep?

Thanks if you can help.

Ian Darwin