iswlower

int iswlower( wint_t ch );

Checks if the given wide character is a lowercase letter, i.e. one of abcdefghijklmnopqrstuvwxyz or any lowercase letter specific to the current locale.

Parameters

Return value

Non-zero value if the wide character is an lowercase letter, zero otherwise.

Notes

ISO 30112 specifies which Unicode characters are include in POSIX lower category.

Example

#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
#include <locale.h>
 
int main(void)
{
    wchar_t c = L'\u0444'; // Cyrillic small letter ef ('ф')
    printf("in the default locale, iswlower(%#x) = %d\n", c, !!iswlower(c));
    setlocale(LC_ALL, "en_US.utf8");
    printf("in Unicode locale, iswlower(%#x) = %d\n", c, !!iswlower(c));
}

in the default locale, iswlower(0x444) = 0
in Unicode locale, iswlower(0x444) = 1

References

• C11 standard (ISO/IEC 9899:2011):
• 7.30.2.1.7 The iswlower function (p: 450)
• C99 standard (ISO/IEC 9899:1999):
• 7.25.2.1.7 The iswlower function (p: 396)

See also