是否有一个动作脚本3的定点库？

Question

我想在Flex中编写计算器，但无法在Web上找到任何定点库。

对于计算器，我需要更高的精度，然后IEEE 754可以保证。例如：

trace(1.4 - .4); //should be 1 but it is 0.9999999999999999 

有人可以建议一个好的定点库吗？

预先感谢您

Answer 1

它的工作原理，但它是不完美的，所有的学分去乔希从http://joshblog.net/2007/01/30/flash-floating-point-number-errors/

/** 
* Corrects errors caused by floating point math. 
*/ 
public function correctFloatingPointError(number:Number, precision:int = 5):Number 
{ 
    //default returns (10000 * number)/10000 
    //should correct very small floating point errors 
    var correction:Number = Math.pow(10, precision); 
    return Math.round(correction * number)/correction; 
} 
/** 
* Tests if two numbers are <em>almost</em> equal. 
*/ 
public function fuzzyEquals(number1:Number, number2:Number, precision:int = 5):Boolean 
{ 
    var difference:Number = number1 - number2; 
    var range:Number = Math.pow(10, -precision); 
    //default check: 
    //0.00001 <difference> -0.00001 
    return difference <range && difference> -range; 
} 
/* 
Copyright (c) 2007 Josh Tynjala 
Permission is hereby granted, free of charge, to any person 
obtaining a copy of this software and associated documentation 
files (the "Software"), to deal in the Software without 
restriction, including without limitation the rights to use, 
copy, modify, merge, publish, distribute, sublicense, and/or sell 
copies of the Software, and to permit persons to whom the 
Software is furnished to do so, subject to the following 
conditions: 
The above copyright notice and this permission notice shall be 
included in all copies or substantial portions of the Software. 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 
OTHER DEALINGS IN THE SOFTWARE. 
*/ 

再次谢谢:)

Answer 2

我不知道的任何，但在此期间，您可以使用此代码片段（不是我）：

public static function correctFloatingPointError(number:Number, precision:int = 5):Number 
    { 
     //default returns (10000 * number)/10000 
     //should correct very small floating point errors 

     var correction:Number = Math.pow(10, precision); 
     return Math.round(correction * number)/correction; 
    }