Re: 1.45 x 1 = 1.450000047683716 ? :: CurrencyConverter
Re: 1.45 x 1 = 1.450000047683716 ? :: CurrencyConverter
- Subject: Re: 1.45 x 1 = 1.450000047683716 ? :: CurrencyConverter
- From: Ricky Sharp <email@hidden>
- Date: Mon, 17 Jan 2005 06:43:42 -0600
On Monday, January 17, 2005, at 00:56AM, R.Claeson <email@hidden> wrote:
>
>On 17 Jan 2005, at 07:44, NOYFB wrote:
>
>> I just completed the Dev Connection tutorial CurrencyConverter
>>
>> http://developer.apple.com/documentation/Cocoa/Conceptual/
>> ObjCTutorial/chapter01/chapter_1_section_1.html#//apple_ref/doc/uid/
>> 20001101.
>>
>> When I enter
>>
>> 1.4 x 1 = 1.450000047683716 should be 1.45
>> 1.1 x x = 1.100000023841858 Should be 1.1
>> 1 x 1 = 1 Ok.
>>
>> I do not think this is normal or maybe it is and there is extremely
>> good explanation to use setFloatingPointFormat.
>>
>> Pleas confirm If it's a bug or that I have to specify some sort of
>> flag/option?
>
>It's not a bug. It's just that floating point variables has never been
>a particularly good choice for representing decimal values with great
>(or even some kind of) accuracy.
Accuracy isn't the issue here; it's precision.
Working with floating point values has been a recent thread on this list. You ultimately should either pick up a book on, or attend a course on, "Numerical Analysis".
--
Rick Sharp
Instant Interactive(tm)
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