#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 " );
    }
}