RE: FW: NSNumberFormatter: Display INT as decimal
RE: FW: NSNumberFormatter: Display INT as decimal
- Subject: RE: FW: NSNumberFormatter: Display INT as decimal
- From: "HAMILTON, Steven" <email@hidden>
- Date: Tue, 4 Nov 2008 11:30:49 +1000
- Acceptlanguage: en-US, en-AU
- Thread-topic: FW: NSNumberFormatter: Display INT as decimal
That would be an idea. I think my reluctance to do that initially was down still not understanding floats and their imprecision. I use bindings for some columns directly into the Core Data INT attribute. I presume I can use a Value Transformer to do this last tweak of the data?
Also, am I right in thinking that a float's imprecision only occurs when trying to use the least significant digit of the float? The one that's rounded up because we've ran out of bits? And therefore all the values before that are expected to be accurate?
-----Original Message-----
From: Daniel Hyde [mailto:email@hidden]
Sent: Tuesday, 4 November 2008 9:38 AM
To: HAMILTON, Steven
Subject: Re: FW: NSNumberFormatter: Display INT as decimal
Can you not simply cast to float, divide by your scaling factor, and
display the result at display time? Then you can just use the normal
float formatting rules to display to 2 decimal places (or however many
you like)
int myAccurateRepresentation = 12789; // in cents
float myScaleFactor = 100.0; // number of cents in a dollar
float myDisplayValue = (float)myAccurateRepresentation / myScaleFactor;
// myDisplayValue == 127.89
If you wanted even more accuracy, simply store a finer grain value in
your accurate representation and increase your scale factor
appropriately, eg:
... = 1278900; // in hundredths-of-cents
... = 10000.0; // number of hundredths-of-cents in a dollar
... -> 127.89
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