function
<cwctype>

iswdigit

int iswdigit (wint_t c);
Check if wide character is decimal digit
Checks whether c is a decimal digit character.

A decimal digit is any of: 0 1 2 3 4 5 6 7 8 9

This function is the wide-character equivalent of isdigit (<cctype>): If c translates with wctob to a character for which isdigit is true, it is always considered a decimal digit character by this function too.

In C++, a locale-specific template version of this function (isdigit) 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 a decimal digit. Zero (i.e., false) otherwise.

Example

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/* iswdigit example */
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
int main ()
{
  wchar_t str[] = L"1776ad";
  long int year;
  if (iswdigit(str[0]))
  {
    year = wcstol (str,NULL,10);
    wprintf (L"The year that followed %ld was %ld.\n",year,year+1);
  }
  return 0;
}


Output:
The year 1777 followed 1776

See also

isdigit
Check if character is decimal digit (function )
iswxdigit
Check if wide character is hexadecimal digit (function )
iswalnum
Check if wide character is alphanumeric (function )
iswalpha
Check if wide character is alphabetic (function )
isdigit (locale)
Check if character is a decimal digit using locale (function template )

C++