Defined in header <wctype.h>
int iswctype( wint_t wc, wctype_t desc );
(since C95)

Classifies the wide character wc using the current C locale's LC_CTYPE category identified by desc.


wc - the wide character to classify
desc - the LC_CTYPE category, obtained from a call to wctype

Return value

Non-zero if the character wc has the property identified by desc in LC_CTYPE facet of the current C locale, zero otherwise.


#include <locale.h>
#include <wchar.h>
#include <wctype.h>
#include <stdio.h>
const char* classify(wchar_t wc, const char* cat)
    return iswctype(wc, wctype(cat)) ? "true" : "false";
int main(void)
    setlocale(LC_ALL, "ja_JP.UTF-8");
    puts("The character \u6c34 is...");
    const char* cats[] = {"digit", "alpha", "space", "cntrl", "jkanji"};
    for(int n = 0; n < 5; ++n)
        printf("%s? %s\n", cats[n], classify(L'\u6c34', cats[n]));


The character 水 is...
digit? false
alpha? true
space? false
cntrl? false
jkanji? true


  • C11 standard (ISO/IEC 9899:2011):
    • The iswctype function (p: 451-452)
  • C99 standard (ISO/IEC 9899:1999):
    • The iswctype function (p: 397-398)

See also

looks up a character classification category in the current C locale

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