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BSD 2.11 - man page for isdigit (bsd section 3)

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CTYPE(3)										 CTYPE(3)

       isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct, isprint, isgraph,
       iscntrl, isascii, toupper, tolower, toascii - character classification macros

       #include <ctype.h>


       . . .

       These macros classify ASCII-coded integer values by table lookup.   Each  is  a	predicate
       returning  nonzero for true, zero for false.  Isascii and toascii are defined on all inte-
       ger values; the rest are defined only where isascii is true and on  the	single	non-ASCII
       value EOF (see stdio(3S)).

       isalpha	      c is a letter

       isupper	      c is an upper case letter

       islower	      c is a lower case letter

       isdigit	      c is a digit

       isxdigit       c is a hex digit

       isalnum	      c is an alphanumeric character

       isspace	      c is a space, tab, carriage return, newline, vertical tab, or formfeed

       ispunct	      c is a punctuation character (neither control nor alphanumeric)

       isprint	      c is a printing character, code 040(8) (space) through 0176 (tilde)

       isgraph	      c is a printing character, similar to isprint except false for space.

       iscntrl	      c  is  a	delete	character(0177) or ordinary control character (less than

       isascii	      c is an ASCII character, code less than 0200

       tolower	      c is converted to lower case.  Return value is undefined if not isupper(c).

       toupper	      c is converted to upper case.  Return value is undefined if not islower(c).

       toascii	      c is converted to be a valid ascii character.


7th Edition				   May 12, 1986 				 CTYPE(3)
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