c# – 双精度数据类型,小数位后计数小数

概述下面的方法应该回答“小数精度,尾随数量的数量,这个(双重)值有什么？”.当值看起来像5900.43,5900.043等时,我做对了.当方法收到5900.00时,它返回0,这是错误的(在我的需要). /// <summary> /// Return count of decimals after decimal-place /// </summary> private int g 下面的方法应该回答“小数精度,尾随数量的数量,这个(双重)值有什么？”.当值看起来像5900.43,5900.043等时,我做对了.当方法收到5900.00时,它返回0,这是错误的(在我的需要).

/// <summary>   /// Return count of decimals after decimal-place    /// </summary>   private int getDecimalCount(double val)   {        int count = 0;        ...        return count;   }

参数’val’是(此方法的正常值的样本)

5900.00返回2
5900.09返回2
5900.000返回3
5900.001返回3
1.0返回1
0.0000005返回7
1.0000000返回7
5900822返回0

我的问题是计算.0 .00 .000等等

题：
我该如何解决这个问题？如果这种方法不可能与双打,怎么回事？

[EDITED]
– 进行小的文本更改以提出更明确的问题,
– 由于’小数位’的错误使用含义导致的语言更正

解决方法 编辑：更新以简化处理不同文化.

与@Miguel类似,这是我将如何处理它：

public static int getDecimalCount(double dVal,string sVal,string culture){    CultureInfo info = CultureInfo.GetCultureInfo(culture);    //Get the double value of the string representation,keePing culture in mind    double test = Convert.Todouble(sVal,info);    //Get the decimal separator the specifIEd culture    char[] sep = info.NumberFormat.NumberDecimalSeparator.tochararray();    //Check to see if the culture-adjusted string is equal to the double    if (dVal != test)    {        //The string conversion isn't correct,so throw an exception        throw new System.ArgumentException("dVal doesn't equal sVal for the specifIEd culture");    }    //Split the string on the separator     string[] segments = sVal.Split(sep);    switch (segments.Length)    {        //Only one segment,so there was not fractional value - return 0        case 1:            return 0;        //Two segments,so return the length of the second segment        case 2:            return segments[1].Length;        //More than two segments means it's invalID,so throw an exception        default:            throw new Exception("Something bad happened!");    }}

美国英语的快捷方法：

public static int getDecimalCount(double dVal,string sVal){    return getDecimalCount(dVal,sVal,"en-US");}

测试：

static voID Main(string[] args){    int i = 0;    double d = 5900.00;     string s = "5900.00";    Console.Writeline("Testing with dVal = {0} and sVal = {1}.",d,s);    i = getDecimalCount(d,s);    Console.Writeline("Expected output: 2. Actual output: {0}",i);    Console.Writeline();    d = 5900.09;    s = "5900.09";    Console.Writeline("Testing with dVal = {0} and sVal = {1}.",i);    Console.Writeline();    d = 5900.000;    s = "5900.000";    Console.Writeline("Testing with dVal = {0} and sVal = {1}.",s);    Console.Writeline("Expected output: 3. Actual output: {0}",i);    Console.Writeline();    d = 5900.001;    s = "5900.001";    Console.Writeline("Testing with dVal = {0} and sVal = {1}.",i);    Console.Writeline();    d = 1.0;     s = "1.0";    Console.Writeline("Testing with dVal = {0} and sVal = {1}.",s);    Console.Writeline("Expected output: 1. Actual output: {0}",i);    Console.Writeline();    d = 0.0000005;     s = "0.0000005";    Console.Writeline("Testing with dVal = {0} and sVal = {1}.",s);    Console.Writeline("Expected output: 7. Actual output: {0}",i);    Console.Writeline();    d = 1.0000000;     s = "1.0000000";    Console.Writeline("Testing with dVal = {0} and sVal = {1}.",i);    Console.Writeline();    d = 5900822;     s = "5900822";    Console.Writeline("Testing with dVal = {0} and sVal = {1}.",s);    Console.Writeline("Expected output: 0. Actual output: {0}",i);    Console.Readline();}

最后,测试的输出：

Testing with dVal = 5900 and sVal = 5900.00.
Expected output: 2. Actual output: 2

Testing with dVal = 5900.09 and sVal = 5900.09.
Expected output: 2. Actual output: 2

Testing with dVal = 5900 and sVal = 5900.000.
Expected output: 3. Actual output: 3

Testing with dVal = 5900.001 and sVal = 5900.001.
Expected output: 3. Actual output: 3

Testing with dVal = 1 and sVal = 1.0.
Expected output: 1. Actual output: 1

Testing with dVal = 5E-07 and sVal = 0.0000005.
Expected output: 7. Actual output: 7

Testing with dVal = 1 and sVal = 1.0000000.
Expected output: 7. Actual output: 7

Testing with dVal = 5900822 and sVal = 5900822.
Expected output: 0. Actual output: 0

如果您对此有疑问或者没有意义,请告诉我.

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