问题描述
我工作的项目欧拉40 ，并有点麻烦，有没有 int.Parse（字符）。没什么大不了的，但我做了一些四处询问，有人建议 char.GetNumericValue 。 GetNumericValue似乎是一个非常奇怪的方法，对我说：
I was working on Project Euler 40, and was a bit bothered that there was no int.Parse(char). Not a big deal, but I did some asking around and someone suggested char.GetNumericValue. GetNumericValue seems like a very odd method to me:
- 在一个字符作为一个参数，并返回......双？
- 返回-1.0如果字符不是0到9
那么，什么是这种方法背后的原因，和什么目的不返回一个双服务？我甚至发射了反射，看着InternalGetNumericValue，但它只是喜欢看失落：每一个答案只是导致了另一个问题
So what's the reasoning behind this method, and what purpose does returning a double serve? I even fired up Reflector and looked at InternalGetNumericValue, but it's just like watching Lost: every answer just leads to another question.
推荐答案
请记住，它采取了统一code字符并返回一个值。 '0'到'9'是标准的十进制数字，但也有一些重新present号码，其中一些是浮点其他的Uni code的字符。
Remember that it's taking a Unicode character and returning a value. '0' through '9' are the standard decimal digits, however there are other Unicode characters that represent numbers, some of which are floating point.
喜欢这个角色：¼
Console.WriteLine( char.GetNumericValue( '¼' ) );
0.25输出在控制台窗口中。
Outputs 0.25 in the console window.
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