isxdigit, iswxdigit

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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

#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		+	+	+