问题描述
IEEE754支持负零.但是这段代码
IEEE754 supports the negative zero.But this code
a := -0.0
fmt.Println(a, 1/a)
输出
0 +Inf
我期望的地方
-0 -Inf
其他基于float格式基于IEEE754的语言，您可以创建负零文字
Other languages whose float format is based on IEEE754 let you create negative zero literals
Java:
float a = -0f;
System.out.printf("%f %f", a, 1/a); // outputs "-0,000000 -Infinity"
C#:
var a = -0d;
Console.WriteLine(1/a); // outputs "-Infinity"
JavaScript:
Javascript :
var a = -0;
console.log(a, 1/a); // logs "0 -Infinity"
但是我在Go中找不到对应的内容.
But I couldn't find the equivalent in Go.
如何在go中编写一个负零文字?
How do you write a negative zero literal in go ?
推荐答案
有已注册的问题.
碰巧提供了一种解决方案:
And it happens to give a kind of solution :
a := math.Copysign(0, -1)
这还不错，因为它显然是指IEEE754定义的标准copysign函数.
It's not so bad as it obviously refers to the standard copysign function defined by IEEE754.
但这意味着您需要导入一个软件包，而对于(当然较小且很少见的)需求来说，这仍然显得太重了.
But this means you need to import a package and this still looks much too heavy for the (admittedly minor and rare) need.
这篇关于Golang中的负零文字的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！