ISDIGIT - check for decimal digit.

(ANSI Standard)

Usage:

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

Where:

int c;

is the character you want to check.

int i;

is 1 if "c" is a decimal digit character, and 0 otherwise.

Description:

"isdigit" determines whether a character is a decimal digit.

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