什么是char.GetNumericValue的处理？ [英] What's the deal with char.GetNumericValue?

问题描述

我在 Project Euler 40 工作，是一个bit困扰，没有 int.Parse（char）。不是什么大问题，但我做了一些问问，有人建议 char.GetNumericValue 。 GetNumericValue对我来说似乎是一个很奇怪的方法：

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:

• 接受char作为参数并返回...？ >
  
• 如果字符不是'0'到'9'，则返回-1.0

这个方法背后有什么目的，返回双重服务？我甚至发射了反射器，看了看InternalGetNumericValue，但它就像看Lost：每个答案只是导致另一个问题。

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

记住，它采用Unicode字符并返回值。 '0'到'9'是标准的十进制数字，但是有其他的Unicode字符表示数字，其中一些是浮点型。

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.

Console.WriteLine( char.GetNumericValue( '¼' ) );

在控制台窗口中输出0.25。

Outputs 0.25 in the console window.

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