为什么将无穷大打印为“ 8”？在Windows 10控制台中？ [英] Why is infinity printed as "8" in the Windows 10 console?

问题描述

我正在测试除法返回的内容，包括零，即 0/1 ， 1/0 和 0/0 。为此，我使用了类似于以下内容的东西：

I was testing what was returned from division including zeroes i.e. 0/1, 1/0 and 0/0. For this I used something similar to the following:

Console.WriteLine(1d / 0d);

但是此代码显示 8 而不是 Infinity 或其他字符串常量，例如 PositiveInfinity 。

However this code prints 8 not Infinity or some other string constant like PositiveInfinity.

为了完整性下面所有的打印 8 ：

For completeness all of the following print 8:

Console.WriteLine(1d / 0d);

double value = 1d / 0d;
Console.WriteLine(value);

Console.WriteLine(Double.PositiveInfinity);

和 Console.WriteLine（Double.NegativeInfinity）; 打印 -8 。

为什么此无穷大打印8？

Why does this infinity print 8?

对于那些似乎认为这是一个无穷大符号而不是八个以下程序的人：

For those of you who seem to think this is an infinity symbol not an eight the following program:

Console.WriteLine(1d / 0d);

double value = 1d / 0d;
Console.WriteLine(value);

Console.WriteLine(Double.PositiveInfinity);

Console.WriteLine(8);

输出：

推荐答案

请确保浮点值为 + Infinity 。浮点数除以零的分子为正，如果浮点数除以零的分子为负，则-无穷大 c $ c>如果浮点除法的分子和分母均为零。这就是 IEEE754浮点规范，这是C＃所使用的。

Be assured that the floating point value is +Infinity if the numerator of a floating point division by zero is positive, -Infinity if the numerator of a floating point division by zero is negative, and NaN if the numerator and denominator of a floating point division are both zero. That's in the IEEE754 floating point specification, which is what C# uses.

在您的情况下，控制台将无穷大符号（有时在印刷上用水平8 —∞表示）转换为垂直8。

In your case, the console is converting the infinity symbol (which is sometimes represented typographically as a horizontal 8 — ∞) to a vertical 8.

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