isxdigit

raw OCR

Character classification macro.

Defined in header <ctype.h>

Syntax

#include <ctype.h>
int isxdigit(int c);

Portability

DOS	UNIX	Windows	ANSI C	C++ only
■	■	■	■

Remarks

isxdigit is a macro that classifies ASCII-coded integer values by table lookup. It is a predicate returning nonzero for true and 0 for false. It is defined only when isascii(c) is true or c is EOF.

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, Ato F,a to f).

Example

#include <ctype.h>
#include <stdio.h>

int main (void)
{
   char c -  'C';
   if (isxdigit (c))
      printf("%c is hexadecimal\n" ,c);
   else
      printf("%c isn't hexadecimal \n",c);
   return 0;

Differences from modern implementations

Nothing recorded yet.

Modern references

cppreference (search)
POSIX (search)
Microsoft C runtime (search)

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Stable link: /3.1/ctype.h/isxdigit/ · short form /3.1/isxdigit/