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isxdigit, iswxdigit

Header File

ctype.h, wctype.h

Category

Classification Routines

Prototype

int isxdigit(int c);

int iswxdigit(wint_t c);

Description

Tests for hexadecimal character.

isxdigit is a macro that classifies ASCII-coded integer values by table lookup. The macro is affected by the current locale’s LC_CTYPE category.

You can make this macro available as a function by undefining (#undef) it.

Return Value

isxdigit returns nonzero if c is a hexadecimal digit (0 to 9, A to F, a to f) or any other hexadecimal digit defined by the locale.

Example

Copy Code

    #include <stdio.h>
    #include <ctype.h>
    int main(void)
    {
      char c = 'C';
      if (isxdigit(c))
        printf("%c is a hexadecimal digit\n",c);
      else
        printf("%c is not a hexadecimal digit\n",c);
      return 0;
    }

Portability

| POSIX | Win32 | ANSI C | ANSI C++
isxdigit | + | + | + | +
iswxdigit |  | + | + | +

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