Alpha Software Mobile Development Tools:   Alpha Anywhere    |   Alpha TransForm subscribe to our YouTube Channel  Follow Us on LinkedIn  Follow Us on Twitter  Follow Us on Facebook



The Alpha Software Forum Participation Guidelines

The Alpha Software Forum is a free forum created for Alpha Software Developer Community to ask for help, exchange ideas, and share solutions. Alpha Software strives to create an environment where all members of the community can feel safe to participate. In order to ensure the Alpha Software Forum is a place where all feel welcome, forum participants are expected to behave as follows:
  • Be professional in your conduct
  • Be kind to others
  • Be constructive when giving feedback
  • Be open to new ideas and suggestions
  • Stay on topic

Be sure all comments and threads you post are respectful. Posts that contain any of the following content will be considered a violation of your agreement as a member of the Alpha Software Forum Community and will be moderated:
  • Spam.
  • Vulgar language.
  • Quotes from private conversations without permission, including pricing and other sales related discussions.
  • Personal attacks, insults, or subtle put-downs.
  • Harassment, bullying, threatening, mocking, shaming, or deriding anyone.
  • Sexist, racist, homophobic, transphobic, ableist, or otherwise discriminatory jokes and language.
  • Sexually explicit or violent material, links, or language.
  • Pirated, hacked, or copyright-infringing material.
  • Encouraging of others to engage in the above behaviors.

If a thread or post is found to contain any of the content outlined above, a moderator may choose to take one of the following actions:
  • Remove the Post or Thread - the content is removed from the forum.
  • Place the User in Moderation - all posts and new threads must be approved by a moderator before they are posted.
  • Temporarily Ban the User - user is banned from forum for a period of time.
  • Permanently Ban the User - user is permanently banned from the forum.

Moderators may also rename posts and threads if they are too generic or do not property reflect the content.

Moderators may move threads if they have been posted in the incorrect forum.

Threads/Posts questioning specific moderator decisions or actions (such as "why was a user banned?") are not allowed and will be removed.

The owners of Alpha Software Corporation (Forum Owner) reserve the right to remove, edit, move, or close any thread for any reason; or ban any forum member without notice, reason, or explanation.

Community members are encouraged to click the "Report Post" icon in the lower left of a given post if they feel the post is in violation of the rules. This will alert the Moderators to take a look.

Alpha Software Corporation may amend the guidelines from time to time and may also vary the procedures it sets out where appropriate in a particular case. Your agreement to comply with the guidelines will be deemed agreement to any changes to it.

Bonus TIPS for Successful Posting

Try a Search First
It is highly recommended that a Search be done on your topic before posting, as many questions have been answered in prior posts. As with any search engine, the shorter the search term, the more "hits" will be returned, but the more specific the search term is, the greater the relevance of those "hits". Searching for "table" might well return every message on the board while "tablesum" would greatly restrict the number of messages returned.

When you do post
First, make sure you are posting your question in the correct forum. For example, if you post an issue regarding Desktop applications on the Mobile & Browser Applications board , not only will your question not be seen by the appropriate audience, it may also be removed or relocated.

The more detail you provide about your problem or question, the more likely someone is to understand your request and be able to help. A sample database with a minimum of records (and its support files, zipped together) will make it much easier to diagnose issues with your application. Screen shots of error messages are especially helpful.

When explaining how to reproduce your problem, please be as detailed as possible. Describe every step, click-by-click and keypress-by-keypress. Otherwise when others try to duplicate your problem, they may do something slightly different and end up with different results.

A note about attachments
You may only attach one file to each message. Attachment file size is limited to 2MB. If you need to include several files, you may do so by zipping them into a single archive.

If you forgot to attach your files to your post, please do NOT create a new thread. Instead, reply to your original message and attach the file there.

When attaching screen shots, it is best to attach an image file (.BMP, .JPG, .GIF, .PNG, etc.) or a zip file of several images, as opposed to a Word document containing the screen shots. Because Word documents are prone to viruses, many message board users will not open your Word file, therefore limiting their ability to help you.

Similarly, if you are uploading a zipped archive, you should simply create a .ZIP file and not a self-extracting .EXE as many users will not run your EXE file.
See more
See less

exact numbers

  • Filter
  • Time
  • Show
Clear All
new posts

    exact numbers

    To my horror I discovered that:
    number with fractional part - int(number) doesn't return the fractional part
    the same with for example:

    eg 6.2 - int(6.2) = 0.2
    returns false!!!

    The only way to work around this is to use round()?

    RE: exact numbers


    Describe the context in which you're doing this.

    When I try the exact same sequence in the interactive editor it works fine. Here's what I see:

    ?6.2 - INT(6.2)
    = 0.200000
    -- tom c


      RE: exact numbers

      Indeed it looks ok, but now try this:
      i = 6.2 - int(6.2)
      ? i=0.2


      ?(6.2 - int(6.2)) = 0.2

      surprise, surprise


        RE: exact numbers


        The definition of int() is to remove the fractional part of a number and return on the the integer portion of the number. Your examples shows that it is working properly.

        What are you trying to do and what are you expecting from the int() function?
        Al Buchholz
        Bookwood Systems, LTD
        Weekly QReportBuilder Webinars Thursday 1 pm CST

        Occam's Razor - KISS
        Normalize till it hurts - De-normalize till it works.
        Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
        When we triage a problem it is much easier to read sample systems than to read a mind.
        "Make it as simple as possible, but not simpler."
        Albert Einstein


          RE: exact numbers

          int() works ok, just used it to show that when the integer part is substracted from a number not the exact fractional part is left, try:

          it returns FALSE !!


            RE: exact numbers

            Must be something in the air where you are....

            = .T.

            ? (6.2 - int(6.2)) = 0.2
            = .T.

            i = 6.2 - int(6.2)

            ? i=0.2
            = .T.

            All work for me.
            There can be only one.


              RE: exact numbers

              Thanks for your reply.
              No wonder the confusion, copied directly from your reply
              to the interactive window and got:
              = .F.

              Also something like:
              results in:
              = .F.

              And now:...
              i = (6.2-6)-0.2
              = 0.000000
              = .F.
              = 0.000167

              Using Alpha Five version 4.5 build 266
              Running Windows XP Professional, version 2002 with service pack 1 installed.
              Located in the Netherlands, so the Dutch version.
              The air is fine over here, anyone an idea?


                RE: exact numbers

                When dealing with variables, you sometimes have to be careful when comparing calculations. Certain fractional arithmatic leaves very small residuals that are basically too small to be seen but pop up in comparisons - this has been cited before.By the way, the same type behavior has been observed in Excel.

                When comparing results of calculations kept in memory, I use the round function.

                This should evaluate as true:
                round(6.2 - int(6.2),2) = 0.2


                  RE: exact numbers

                  I already assumed that I would have to use round() extensively with any calculations dealing with possible fractional parts. Not only with int(), mod() ..., but also
                  with plain additions and substractions.

                  And how come that Stan Mathews gets true with
                  while I get false?

                  This behavior only occurs when the result is between -2.2 and 2.2, sounds a bit buggy to me.


                    RE: exact numbers

                    First, I have no idea why it works for Stan. He didn't give any details about the platform.

                    In the interactive window of Alpha try the following:
                    ?3.33 + 0.55 + 0.33 + 8 + 0.21 -12.42 = 0
                    = .F.
                    Put this into a cell on an Excel spreadsheet:
                    =3.33 + 0.55 + 0.33 + 8 + 0.21 -12.42 = 0
                    It should evaluate to FALSE

                    There seems to be some difficulty going from decimal to binary and back to decimal.Bottom line is be careful when comparing calculation results not just in Alpha, but in other apps as well.


                      RE: exact numbers

                      Sorry guys, I was on my V5 only machine and didn't consider the implications. (xp and v5)

                      Can confirm the problematic results with 4.5 on a Win 98 machine as well.

                      I'll try to stay more awake next time I drop in on the v4.5 board.
                      There can be only one.


                        RE: exact numbers

                        OK, Excel also has problems with this.
                        But the conversion from binary to decimal and vice verse can be done correctly. Just use more precission internally with calculations and automaticly round the result to a lesser precission.

                        Glad to hear the problem is fixed in version 5, because I probably opt for version 6.


                          RE: exact numbers


                          >>Glad to hear the problem is fixed...

                          John's advice is solid. I don't think you should ever rely on exact comparisons automatically rounding exactly to the displayed number of decimals. Some decimal numbers simply cannot be expressed "exactly" in binary form. The best any computer can do is to approximate the decimal number in binary form.

                          A commonplace example of this is found in the payroll module of QuickBooks. Often the computed payroll tax liabilities for an entire quarter differ slightly from the sum of the monthly payroll tax deposit calculations. Intuit and the IRS describe it as a 'rounding error', and manual adjustments are permitted.

                          It's a fact of life with computers which work in binary, while "we" work in decimal.

                          In short, if you're using exact comparisons in your application the developer must shoulder the responsibility for manually rounding the computed results before doing the comparisons.

                          -- tom


                            RE: exact numbers

                            Hi Tom,

                            Can't agree with:
                            The best any computer can do is to approximate the decimal number in binary form.

                            Any computer should probably read any program.
                            But besides that, one option is to store numbers in BCD format, another to do calculations as mentioned in a higher precission and round the results to a lesser one.
                            Suppose version 5 does this, because it hasn't this problem. And there other programs that do it right.