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34 .\" @(#)isupper.3 5.2 (Berkeley) 6/29/91
41 .Nd upper-case character test
51 function tests for any upper-case letter or any of an
52 implementation-defined set of characters for which none of
63 returns true only for the characters defined as upper-case letters.
67 function returns zero if the character tests false and
68 returns non-zero if the character tests true.
98 or representable as an
100 otherwise, the behavior is undefined.