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Currency calculations. Bug?
Message
 
À
31/03/2011 10:00:45
Information générale
Forum:
Visual FoxPro
Catégorie:
Problèmes
Versions des environnements
Visual FoxPro:
VFP 9 SP1
OS:
Windows XP SP2
Divers
Thread ID:
01505515
Message ID:
01505712
Vues:
38
>Yuri,
>
>it's a well known fact between mathematicians that multiplication should ALWAYS be done before a division in order to preserve the precision. One good example:
>1*3/3 = 3/3 =1.
>1/3*3 = 0.33333333333333333333333333333333*3=0.99999999999999999999999999999999
>
>>Thanks for the reply.
>>
>>Though I do not share your both opinions about parentheses or the multiplication should go first.
>>I see them as a workarounds similar to MTON that I used in my original post.
>>Not to mention that either you need to know in advance that you are dealing with the currency type, or you need to check the type in the code prior to process calculaltion
>>
>>From my point of view, it is a bug or at least a special "feature" that is not documented in VFP Help.
>>
>>Thanks


Trying to represent the problem and dealing with replyes, I eventually forgot the actual expression in the code where I discovered this behavior:

?fldcur * (n2/n1-1) && 7050.0000
?(n2/n1-1) * fldcur && 7050.0000


Looks like neither parentheses nor order of operations help here.
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