串分数为Double [英] String Fraction to Double

问题描述

我需要一个函数来分析数字的用户输入到一倍。我不能做任何客户端或更改输入怎样的用武之地。

I need a function to parse a user inputs of numbers to doubles. I cannot do anything client side or change how the input comes in.

Input       | Desired Output
"9"         | 9
"9 3/4"     | 9.75
" 9  1/ 2 " | 9.5
"9 .25"     | 9.25
"9,000 1/3" | 9000.33
"1/4"       | .25

我看到这个帖子，但它使用Python，我只是想知道是否有人知道处理这个我花时间去写我自己之前任何花哨的C＃的方式。

I saw this post, but it uses Python, I was just wondering if anybody knew any fancy C# ways of handling this before I spend time to write my own.

推荐答案

下面是我最终使用：

private double ParseDoubleFromString(string num)
{
    //removes multiple spces between characters, cammas, and leading/trailing whitespace
    num = Regex.Replace(num.Replace(",", ""), @"\s+", " ").Trim();
    double d = 0;
    int whole = 0;
    double numerator;
    double denominator;

    //is there a fraction?
    if (num.Contains("/"))
    {
        //is there a space?
        if (num.Contains(" "))
        {
            //seperate the integer and fraction
            int firstspace = num.IndexOf(" ");
            string fraction = num.Substring(firstspace, num.Length - firstspace);
            //set the integer
            whole = int.Parse(num.Substring(0, firstspace));
            //set the numerator and denominator
            numerator = double.Parse(fraction.Split("/".ToCharArray())[0]);
            denominator = double.Parse(fraction.Split("/".ToCharArray())[1]);
        }
        else
        {
            //set the numerator and denominator
            numerator = double.Parse(num.Split("/".ToCharArray())[0]);
            denominator = double.Parse(num.Split("/".ToCharArray())[1]);
        }

        //is it a valid fraction?
        if (denominator != 0)
        {
            d = whole + (numerator / denominator);
        }
    }
    else
    {
        //parse the whole thing
        d = double.Parse(num.Replace(" ", ""));
    }

    return d;
}

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