iswalnum - cppreference.com (original) (raw)

| | | | | --------------------------- | | ----------- | | int iswalnum( wint_t ch ); | | (since C95) |

Checks if the given wide character is an alphanumeric character, i.e. either a number (0123456789), an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), a lowercase letter (abcdefghijklmnopqrstuvwxyz) or any alphanumeric character specific to the current locale.

[edit] Parameters

[edit] Return value

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

[edit] Notes

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

[edit] Example

#include <stdio.h> #include <locale.h> #include <wchar.h> #include <wctype.h>   int main(void) { wchar_t c = L'\u13ad'; // the Cherokee letter HA ('Ꭽ') printf("in the default locale, iswalnum(%#x) = %d\n", c, !!iswalnum(c)); setlocale(LC_ALL, "en_US.utf8"); printf("in Unicode locale, iswalnum(%#x) = %d\n", c, !!iswalnum(c)); }

Possible output:

in the default locale, iswalnum(0x13ad) = 0 in Unicode locale, iswalnum(0x13ad) = 1

[edit] References

• C23 standard (ISO/IEC 9899:2024):

• TBD The iswalnum function (p: TBD)

• C17 standard (ISO/IEC 9899:2018):

• 7.30.2.1.1 The iswalnum function (p: 327)

• C11 standard (ISO/IEC 9899:2011):

• 7.30.2.1.1 The iswalnum function (p: 448)

• C99 standard (ISO/IEC 9899:1999):

• 7.25.2.1.1 The iswalnum function (p: 394)

[edit] See also