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   9 <title>section 7.8.2: Character Class Testing and Conversion</title>
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  15 <H2>section 7.8.2: Character Class Testing and Conversion</H2>
  16
  17 <p>One quirk of these functions,
  18 which the authors mention briefly,
  19 is that although they accept arguments of type <TT>int</TT>,
  20 it is not legal to pass just any <TT>int</TT> value to them.
  21 If you were to attempt to call <TT>isupper(12345)</TT>,
  22 it might do something bizarre.
  23 You should only call these functions
  24 with arguments which represent valid character values.
  25 (Also,
  26 they are guaranteed to accept the value EOF gracefully.)
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