Есть ли библиотека с фиксированной точкой для actionscript 3?

Я хотел бы написать калькулятор во Flex, но не могу найти в Интернете библиотеки с фиксированной точкой.

Для калькулятора мне нужна большая точность, чем может гарантировать IEEE 754. Например:

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

Может ли кто-нибудь предложить хорошую библиотеку с фиксированной точкой, пожалуйста?

заранее спасибо


fixed-point actionscript-3 apache-flex
person a.s.t.r.o    schedule 06.02.2010    source источник

Ответы (2)


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Это работает, но не идеально, все кредиты принадлежат Джошу из 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.
*/

Еще раз спасибо :)

person a.s.t.r.o    schedule 07.02.2010

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Я ничего не знаю, но пока вы можете использовать этот фрагмент кода (не мой):

    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;
    }
person Allan    schedule 07.02.2010