Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!boulder!tramp!hartkopf From: hartkopf@tramp.Colorado.EDU (Jeff Hartkopf) Newsgroups: comp.sys.apple Subject: problem with calculations in an NDA Message-ID: <10862@boulder.Colorado.EDU> Date: 18 Aug 89 20:24:28 GMT Sender: news@boulder.Colorado.EDU Reply-To: hartkopf@tramp.Colorado.EDU (Jeff Hartkopf) Organization: University of Colorado, Boulder Lines: 30 I have a question about an NDA I am programming. It is a calculator NDA, and so far it can do the basic calculations on any numbers (integers or floating point). I'm writing it in TML Pascal, but have tried it in Orca/C and have had the same problem. Everything works fine when I use the NDA from most programs (including AppleWorks GS, Vaccine II, Advanced Disk Utilites, Sound Studio, TML Pascal); however, in a few programs including the Finder, Installer, and SHRConvert, the calculations don't work right. The correct behavior, which works in most programs, is when I enter ".3 =" on the calculator, ".3" appears on the display, and whenever I press "=" thereafter, a ".3" remains on the display. However, in the programs with which the NDA does not work, when I enter ".3 =", a ".299999999" appears on the display, and when I continue to press "=" the number decrements by .000000001 each time; i.e. it goes from ".299999999" to ".299999998" to ".299999997", etc. Entering integer numbers works fine from all programs. Now what could possibly be causing this? I'm only using the standard TML Pascal operations (+, -, *, and /) on variables of type real (extended), and then converting them to strings via the RealToString() call to display on the calculator disply. What is going wrong when I run the NDA under the Finder and some other programs? Every program I've tried that I know is written with TML Pascal works with it. Also, in AWGS (which I don't think is written in Pascal :-)) it works fine. Is there some toolset which I'm supposed to start up for just basic operations like that, which happens to be loaded by the programs it works under, and not by the others? Any insights into this problem would be greatly appreciated. Jeff Hartkopf Internet: hartkopf@tramp.Colorado.EDU