是否有用于 actionscript 3 的定点库？答案

【问题标题】：Is there a fixed-point library for actionscript 3?是否有用于 actionscript 3 的定点库？
【发布时间】：2010-02-06 17:45:11
【问题描述】：

我想在 Flex 中编写一个计算器，但在网上找不到任何定点库。

对于计算器，我需要比 IEEE 754 能保证的更高的精度。例如：

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

有人可以推荐一个好的定点库吗？

提前谢谢你

【问题讨论】：

标签： apache-flex actionscript-3 fixed-point

【解决方案1】：

它有效，但并不完美，所有学分都来自http://joshblog.net/2007/01/30/flash-floating-point-number-errors/的乔希

/**
 * 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
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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
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The above copyright notice and this permission notice shall be
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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OTHER DEALINGS IN THE SOFTWARE.
*/

再次感谢您:)

【讨论】：

【解决方案2】：

我不知道，但与此同时你可以使用这个 sn-p 代码（不是我的）：

    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;
    }

【讨论】：