ISALNUM - check for alphanumeric character.

(ANSI Standard)

Usage:

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

Where:

int c;
is the character you want to check.
int i;
is 1 if "c" is alphanumeric, and 0 otherwise.

Description:

"isalnum" determines whether a character is alphanumeric.

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