iswdigit
From cppreference.com
| Defined in header <wctype.h>
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| int iswdigit( wint_t ch ); |
(since C95) | |
Checks if the given wide character corresponds (if narrowed) to one of the ten decimal digit characters 0123456789.
Parameters
| ch | - | wide character |
Return value
Non-zero value if the wide character is an numeric character, zero otherwise.
Notes
iswdigit and iswxdigit are the only standard wide character classification functions that are not affected by the currently installed C locale.