7.25.2.1.11 The iswupper function

Synopsis

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#include <wctype.h>
int iswupper(wint_t wc);

Description

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The iswupper function tests for any wide character that corresponds to an uppercase letter or is one of a locale-specific set of wide characters for which none of iswcntrl, iswdigit, iswpunct, or iswspace is true.