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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