ISXDIGIT - check for hexadecimal digit.

(ANSI Standard)

Usage:

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

Where:

int c;
is the character you want to check.
int i;
is 1 if "c" is a decimal digit, or the upper or lower case letters 'A' through 'F'. Otherwise, it is zero.

Description:

"isxdigit" determines whether a character is a hexadecimal digit.

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