From: colin AT bird DOT fu DOT is DOT saga-u DOT ac DOT jp (Colin Peters) Subject: RE: Amendment to post: atof() bug in b17.1 & b18? 14 Jun 1997 22:47:40 -0700 Approved: cygnus DOT gnu-win32 AT cygnus DOT com Distribution: cygnus Message-ID: <01BC798B.63729540.cygnus.gnu-win32@gbird0> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Original-To: "'e DOT dennis AT pemail DOT net'" Original-Cc: "'GNU-Win32'" Original-Sender: owner-gnu-win32 AT cygnus DOT com E. Dennis[SMTP:e DOT dennis AT pemail DOT net] wrote: >Hi. Yes, more info. Sorry. Sorry if I sounded abrupt in that last post. However, the results below just go to show that example code is important. The code you give compiles and gives correct output on my system (win95 P100) with either the Cygwin32 or Mingw32 libraries given that you make one small change. The first line of your code should read: #include If you don't do this atof is assumed to return an int, which gets "converted" to a float, resulting in completely silly numbers. If I leave out the include I get the same results as you under Cygwin32 and all numbers give the same large (and completely wrong) value under Mingw32. (Why the results are different from the different libraries is somewhat baffling I'll admit.) If you compile with the -Wall option (all warnings on) you get this: junk.c:3: warning: return-type defaults to `int' junk.c: In function `main': junk.c:11: warning: implicit declaration of function `atof' junk.c:17: warning: implicit declaration of function `printf' Line 3 is complaining about no return type for main. Line 11 is the important one, because the implicit declaration assumes an int to be returned. After adding an int return type to main and including stdlib.h and stdio.h all of these warnings go away and the code works fine. The moral of the story is to always try compiling with warnings on. The second moral is to always prototype, especially if you use functions that don't return int. :) Hope this helps, Colin. -- Colin Peters - colin AT bird DOT fu DOT is DOT saga-u DOT ac DOT jp -- Saga University Dept. of Information Science -- http://www.fu.is.saga-u.ac.jp/~colin/index.html -- http://www.geocities.com/Tokyo/Towers/6162/ - For help on using this list (especially unsubscribing), send a message to "gnu-win32-request AT cygnus DOT com" with one line of text: "help".