Thank you very much. That help me a lot. --- In [email protected], "Gordon Smith" <[EMAIL PROTECTED]> wrote: > > You presumably meant the result should be 23.7, not 23.8. > > > > However, getting 23.700000000000003 isn't a bug; you'd get the same > answer in other languages like Java and C++. The imprecision is because > Number in ActionScript (like float in Java and C++) stores a > floating-point value as a binary fraction, not as a decimal fraction. > These datatypes use binary fractions because that's how current > microprocessors store and manipulate floating-point values. > > > > Java solves this problem by having a BigDecimal class whjich can store > decimal fractions. In that case, computations are slower because it > takes many microsprocessor instructions to do a single operation. > > > > The current version of ActionScript doesn't have any decimal fraction > datatype, but it is under consideration for a future version of the > language. The lack of this feaure comes up about once a week, and some > participants on flexcoders have discussed the possibiliy of porting > BigDecimal or its equivalent to ActionScript. > > > > Perhaps you can simply round your results to the precision you need? > Take a look at the toFixed() method of the Number class. > > > > - Gordon > > > > ________________________________ > > From: [email protected] [mailto:[EMAIL PROTECTED] On > Behalf Of beloved_zhou > Sent: Wednesday, August 30, 2006 4:22 AM > To: [email protected] > Subject: [flexcoders] Is this a bug? About Number type. > > > > I am using Flex2.0, and I try to get a result about 3 multiply 7.9, > the result should be 23.8, but I got 23.700000000000003. > > Here is a sample code: > <?xml version="1.0" encoding="utf-8"?> > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml > <http://www.adobe.com/2006/mxml> " > layout="absolute"> > <mx:TextInput x="76" y="348" id="txt_1" text="3"/> > <mx:TextInput x="291" y="348" id="txt_2" text="7.9"/> > <mx:TextInput x="560" y="348" id="txt_3"/> > <mx:Button x="474" y="348" label="Button" click="doIt()"/> > <mx:Script> > <![CDATA[ > private var num1:Number = 3; > private var num2:Number = 7.9; > > private function doIt():void > { > txt_3.text = String(Number(txt_1.text) * Number(txt_2.text)); > trace(num1 * num2); > } > ]]> > </mx:Script> > </mx:Application> >
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