function
<cwctype>
iswalnum
Check if wide character is alphanumeric
Checks whether c is either an alphabetic letter (either uppercase or lowercase) or a decimal digit.
The result is true if either iswalpha or iswdigit would also return true for c.
This function is the wide-character equivalent of isalnum (<cctype>): If c translates with wctob to a character for which isalnum is true, it is always considered alphanumeric by this function too.
In C++, a locale-specific template version of this function (isalnum) exists in header <locale> for all character types.
Parameters
- c
- Wide character to be checked, casted to a wint_t, or WEOF.
wint_t is an integral type.
Return Value
A value different from zero (i.e., true) if indeed c is either a digit or a letter. Zero (i.e., false) otherwise.
Example
1
2
3
4
5
6
7
8
9
10
11
12
| /* iswalnum example */ #include <stdio.h> #include <wctype.h> int main () { int i; wchar_t str[] = L"c3po..."; i=0; while (iswalnum(str[i])) i++; wprintf (L"The first %d characters are alphanumeric.\n",i); return 0; }
|
Output:
The first 4 characters are alphanumeric. |
See also
- isalnum
- Check if character is alphanumeric (function)
- iswalpha
- Check if wide character is alphabetic (function)
- iswdigit
- Check if wide character is decimal digit (function)
- isalnum (locale)
- Check if character is alphanumeric using locale (function template)