Re: NSNumber stringValue
Re: NSNumber stringValue
- Subject: Re: NSNumber stringValue
- From: Bryan Henry <email@hidden>
- Date: Sat, 12 Dec 2009 00:14:29 -0500
You should not compare floating point numbers for equality in most cases. This is true of any language on any platform.
See http://www.cygnus-software.com/papers/comparingfloats/Comparing floating point numbers.htm
- Bryan
On Dec 10, 2009, at 10:02:23 PM, RedleX Support wrote:
> Hi,
>
> I need to output a double into a text file and then read it back with 100% accuracy, will using NSNumber stringValue and then using NSString doubleValue give me good results?
>
> For example, if I write the following:
>
> double a,b;
>
> a=some number;
>
> b=[[[NSNumber numberWithDouble:a] stringValue] doubleValue];
>
> will a==b
>
> TIA
>
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