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Adding a negative number

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    Adding a negative number

    I am trying to calculate a checksum value. However my calculation is returning an incorrect result. Has anyone seen this before and how do I prevent this from happening?

    From Interactive:
    Code:
    DIM vSvcCasTotalN as N
    
    vSvcCasTotalN = 284.15
    
    
    DIM vSvcAmountN as N
    
    vSvcAmountN = -124.15
    ?vSvcCasTotalN
    = 284.15
    
    ?vSvcAmountN
    = -124.15
    
    ?vSvcCasTotalN + vSvcAmountN
    = 159.99999999999997
    Andrew

    #2
    Re: Adding a negative number

    Honest, not writing from Alpha sales, but it does this in Interactive V11 but gives the right answer (160) in V12.

    However, if you put this in an A5W page it will calculate correctly in V11 as well. Appears only the Interactive is funky.
    Steve Wood
    See my profile on IADN

    Comment


      #3
      Re: Adding a negative number

      round() it as a last resort.
      Dave Mason
      [email protected]
      Skype is dave.mason46

      Comment


        #4
        Re: Adding a negative number

        What system are you using? CPU? RAM?

        Comment


          #5
          Re: Adding a negative number

          Originally posted by Steve Wood View Post
          Honest, not writing from Alpha sales, but it does this in Interactive V11 but gives the right answer (160) in V12.

          However, if you put this in an A5W page it will calculate correctly in V11 as well. Appears only the Interactive is funky.
          I first discovered it in an XBasic script in V11 3381-4096


          Originally posted by DaveM View Post
          round() it as a last resort.
          Round() was the only thing I could think of to fix it.


          Originally posted by G Gabriel View Post
          What system are you using? CPU? RAM?
          CPU:i7-M620
          Mem: 4096MB

          Windows 8.1 Pro 64-bit
          Andrew

          Comment


            #6
            Re: Adding a negative number

            In the same way the decimal system can only approximate 10 divided by 3, binary systems (used by computers) can only approximate certain arithmetic values. You've stumbled on one.

            Comment


              #7
              Re: Adding a negative number

              Originally posted by Tom Cone Jr View Post
              In the same way the decimal system can only approximate 10 divided by 3, binary systems (used by computers) can only approximate certain arithmetic values. You've stumbled on one.
              I stumbled on a lot of them. This was the one that I pulled to test and determine why the check sum was failing. When I get back to this I will try the Round() function to see if that will get me what I need.

              Another thought, maybe I could multiple the values by 100 to eliminate the decimals when performing the check sum.
              Andrew

              Comment


                #8
                Re: Adding a negative number

                CPU:i7-M620
                Mem: 4096MB

                Windows 8.1 Pro 64-bit
                probably has to do with the math processor not the main processor and how it handles the numbers.
                if you need two digit decimal then round will be the best.
                thanks for reading

                gandhi

                version 11 3381 - 4096
                mysql backend
                http://www.alphawebprogramming.blogspot.com
                [email protected]
                Skype:[email protected]
                1 914 924 5171

                Comment


                  #9
                  Re: Adding a negative number

                  Just got back to this project, multiplying by 100 did not help. Testing with the round() function is yielding desirable results. Thank you for the help.
                  Andrew

                  Comment


                    #10
                    Re: Adding a negative number

                    You tried CCVALID and CHKDIGIT and they were no use?
                    See our Hybrid Option here;
                    https://hybridapps.example-software.com/


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