big Float numbers problem

rbuser

When I set a big Float number to a Tppvariable component it displays wrong
value.

For example a variable that its datatype = dtExtended
in the Rap I wrote;
Variable1.AsExtended := 30000000 * 100;

it displays -1294967296

Any idea.

rbuser

Hi Huseyin,

looks like a parser bug, some calculations run fine e.g.
Value := 3.01 * Power(10, 7) * 100.0; {tested with ReportBuilder 5.56}
What version of ReportBuilder are you using?

regards,
Chris Ueberall;

digitalmetaphors

Actually this seems to be a Delphi bug and is reproducible in regular Delphi
calculation. That calculation produces an overflow error by the compiler
while 30000000.0 * 100.0 and 3000000000 * 1 work fine even though they are
the same value.


--
Cheers,

Alexander Kramnik
Digital Metaphors

rbuser

Hi Alexander,

30000000.0 * 100.0 doesn't works in 5.56, probably the case for Huseyin.

regards,
Chris Ueberall;

"Alexander Kramnik (Digital Metaphors)" wrote

rbuser

RB version 5.55

if you use real numbers no problem.
100000000 * 100.5 OK
100000000 * 100 problem

rbuser

I have tested it in RB 6.02 and Delphi 6.
the problem continues.

I have never displayed huge numbers in Tppvariable that fractional part is
0.

I do a calculation in detail band:
Variable1.asextended := Variable1.asextended + myData['PRICE']

if Price is whole number than variable1 doesn't display the correct value,
but if price is fractional number than the result correct.

digitalmetaphors

Try this as a temporary workaround:

if (Variable1.AsExtended - Floor(Variable1.AsExtended) <> REALLY_SMALL_REAL)
then
leOffSet := 0.1
else
leOffset := 0.0;

Variable1.AsExtended := (Variable1.AsExtended + (myData['PRICE'] +
leOffset)) - leOffset;

In theory REALLY_SMALL_REAL should be 0. In practice you might want to make
it a really small decimal, i.e. 1e-5

--
Cheers,

Alexander Kramnik
Digital Metaphors