isdigit()

Purpose:

isdigit() indicates if <str> is all digits or not.

Usage:

ret = isdigit(<str>);

Arguments:

alpha <str> - The alpha var to check.

Returns:

integer <ret>

0 - <str> is not composed of ONLY digits.

1 - <str> is composed of ONLY digits.

Where Used:

isdigit() can be called from anywhere.

Example:

Description:

isdigit() returns 1 if <str> is composed of ONLY digits. If there are any characters other than 0-9, then isdigit() returns 0. If <str> is NULL, then isdigit() will return 1 because there are no non-digit characters.

Bugs/Features/Comments:

See Also: islower() isupper() toupper()