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signed zero problem

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    signed zero problem

    hi again all:

    there is a little glitch in a5v4 that has me confused. i have an adjustment set for the gl. the post button totals all of the credit and debit records in the child table and if the result is not zero it notifies the user. for the last two years of record entry it has gone without a hitch, but using debug (entering known values to sum to zero) the balance_1 variable returns a value of -0.0000 after the summing. this does not pass the if balance_1 !=0 trap and causes an error. there are some obvoius work arounds to this but i was just wondering if anyone else had seen it.



    RE: signed zero problem

    hi again:

    an addendum to the last post.

    the problem occurs if the variable was positive prior to the last entry subtracting (adding a negitive) the amount to zero. the fileds are numeric 10 , 2 and there is no division so i don't think that this is a rounding issue.




      RE: signed zero problem

      it is a rounding issue because you are using a variable - I have run into it, too. when the value is 0 it returns a false or non-zero value, but only under certain circumstances

      try this:
      if amount_due.value (a form object) - round(variable,2) 0
      if tbl.amount_due-round(variable,2) 0

      also if variable .01

      play aroubnd with it

      also experiment with putting the variable on the form hidden and use its value

      I had a form where it only came up after about two years when a value had like 10.55 instead of 10.50
      Cole Custom Programming - Terrell, Texas
      972 524 8714
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      "A young man who is not liberal has no heart, but an old man who is not conservative has no mind." GB Shaw


        RE: signed zero problem

        hi martin:

        thanks for your reply!

        i thought that the rounding issue would have occurred only on a division, however as you pointed out it is a variable which is not not obligated to have the same decimal precision as the fields it is working on. your solution is a little tidier than the one i came up with ... thank you!




          RE: signed zero problem


          It normally is a good idea to round all currency calculations to 2 decimals. If I am doing a compare, I round both sides of the calculation

          if round(tbl.amount_due,2)round(variable,2)



            RE: signed zero problem

            hi jerry:

            amazingly the problem only surfaced after two years, guess i was just lucky so far. converting all equations to round at this time.

            thanks for your reply!