[AccessD] Rounding with CCur conversion

Gustav Brock Gustav at cactus.dk
Fri May 2 01:57:04 CDT 2008


Hi Asger

First, this:

  CCur(111.11115)

returns here 111.1112 as expected. Don't know why you get a different result.

Then, the CCur, CInt, CLng and CByte functions perform Banker's rounding while Int and Fix don't.

Further, Round is known to be buggy, so avoid that for any serious purpose.

If you are interested in rounding and how to optimise this regarding speed while still being accurate, read on here:

  http://www.xbeat.net/vbspeed/c_Round.htm 

Note that the absolutely simplest (but slowest) method to perform 100% correct (mathematical) rounding is ... Format!

/gustav

>>> ab-mi at post3.tele.dk 02-05-2008 01:55 >>>
Hi group,

 

I just noticed that the algorithm in VB for rounding seems to be different
for the Round-function and the CCur-function.

The Round-function use "Banker's rounding", also known as "Dutch rounding".
The CCur-function behaves differently:

Round(1.11115,4) --> 1.1112

Round(11.11115,4) --> 11.1112

Round(111.11115,4) --> 111.1112

CCur(1.11115) --> 1.1112

CCur(11.11115) --> 11.1112

CCur(111.11115) --> 111.1111  ?!!

 

What's going on in the last conversion? Is this a bug or does the
CCur-function have a special algorithm?

 

TIA

Asger





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