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Full Discussion: C++ how to isdigit() a negative number?
Top Forums Programming C++ how to isdigit() a negative number? Post 302188056 by shamrock on Tuesday 22nd of April 2008 03:01:44 PM
Old 04-22-2008
isdigit() is doing what it is supposed to do. It filters out the character stream into digits and non-digits. So the minus will be discarded as not being a digit. Change the code so that it skips over the sign and after reading in the digit prepend the sign to it.
 

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LEARN ABOUT CENTOS

tapset::string

tapset::string(3stap)													     tapset::string(3stap)

NAME

       tapset::string - systemtap string tapset

DESCRIPTION

       strlen Returns the length of a string

	      See function::strlen(3stap)
	       for details.

       substr Returns a substring

	      See function::substr(3stap)
	       for details.

       stringat
	      Returns the char at a given position in the string

	      See function::stringat(3stap)
	       for details.

       isinstr
	      Returns whether a string is a substring of another string

	      See function::isinstr(3stap)
	       for details.

       text_str
	      Escape any non-printable chars in a string

	      See function::text_str(3stap)
	       for details.

       text_strn
	      Escape any non-printable chars in a string

	      See function::text_strn(3stap)
	       for details.

       - strtol
	      Convert a string to a long

	      See function::-strtol(3stap)
	       for details.

       isdigit
	      Checks for a digit

	      See function::isdigit(3stap)
	       for details.

SEE ALSO

	 function::strlen(3stap),    function::substr(3stap),	function::stringat(3stap),  function::isinstr(3stap),  function::text_str(3stap),
       function::text_strn(3stap),  function::-(3stap),  function::strtol(3stap),  function::isdigit(3stap),  stap(1), stapprobes(3stap)

IBM
									---						     tapset::string(3stap)
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