iswalpha

int iswalpha( wint_t ch );

Checks if the given wide character is an alphabetic character, i.e. either an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), a lowercase letter (abcdefghijklmnopqrstuvwxyz) or any alphabetic character specific to the current locale.

Parameters

Return value

Non-zero value if the wide character is a alphabetic character, zero otherwise.

Example

#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
#include <locale.h>
 
int main(void)
{
    wchar_t c = L'\u0b83'; // Tamil sign Visarga ('ஃ')
    printf("in the default locale, iswalpha(%#x) = %d\n", c, !!iswalpha(c));
    setlocale(LC_ALL, "en_US.utf8");
    printf("in Unicode locale, iswalpha(%#x) = %d\n", c, !!iswalpha(c));
}

in the default locale, iswalpha(0xb83) = 0
in Unicode locale, iswalpha(0xb83) = 1

References

• C11 standard (ISO/IEC 9899:2011):
  • 7.30.2.1.2 The iswalpha function (p: 448-449)
• C99 standard (ISO/IEC 9899:1999):
  • 7.25.2.1.2 The iswalpha function (p: 394-395)

See also