isxdigit

test for any hexadecimal digit

Synopsis:

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

Description:

The isxdigit() function tests for any hexadecimal-digit character. These characters are the digits ('0' through '9') and the letters ('a' through 'f') and ('A' through 'F').

Returns:

The isxdigit() function returns a non-zero value when the argument is a hexadecimal digit; otherwise, it returns zero.

See also:

isalnum(), isalpha(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isupper(), tolower(), toupper()

Examples:

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

char chars[] = {'A', '5', '$'};

#define SIZE sizeof( chars ) / sizeof( char )

void main()
  {
    int   i;

    for( i = 0; i < SIZE; i++ ) {
      printf( "Char %c is %sa hexadecimal digit"
        " character\n", chars[i],
        ( isxdigit( chars[i] ) ) ? "" : "not " );
    }
  }

produces the output

Char A is a hexadecimal digit character
Char 5 is a hexadecimal digit character
Char $ is not a hexadecimal digit character

Classification:

ANSI

Systems:

All (except DOS/PM)