char.GetNumericValue 是怎么回事?

问题描述

我正在研究 Project Euler 40，并且是有点困扰，没有 int.Parse(char).没什么大不了的，但我做了一些询问，有人建议使用 char.GetNumericValue.GetNumericValue 对我来说似乎是一个非常奇怪的方法:

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:

• 接受一个 char 作为参数并返回...一个双精度值?
• 如果 char 不是 '0' 到 '9'，则返回 -1.0

那么这种方法背后的原因是什么，返回双重服务的目的是什么?我什至启动了 Reflector 并查看了 InternalGetNumericValue，但这就像在看 Lost:每个答案都会导致另一个问题.

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

请记住，它采用 Unicode 字符并返回一个值.'0' 到 '9' 是标准的十进制数字，但还有其他 Unicode 字符表示数字，其中一些是浮点数.

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:

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

在控制台窗口中输出 0.25.

Outputs 0.25 in the console window.

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