| title | description | verification |
|---|---|---|
What Every Programmer Should Know About Floating-Point Arithmetic |
Aims to provide both short and simple answers to the common recurring questions of novice programmers about floating-point numbers not 'adding up' correctly, and more in-depth information about how IEEE 754 floats work, when and how to use them correctly, and what to use instead when they are not appropriate. |
SoYmbsJEmSz2s1LmZk_cku4pKwhRsU6m0ZOTgGdnTL0 |
So you've written some absurdly simple code, say for example:
0.1 + 0.2
and got a really unexpected result:
0.30000000000000004
Maybe you asked for help on some forum and got pointed to a long article with lots of formulas that didn't seem to help with your problem.
Well, this site is here to:
- Explain concisely why you get that unexpected result
- Tell you how to deal with this problem
- If you're interested, provide in-depth explanations of why floating-point numbers have to work like that and what other problems can arise
You should look at the Basic Answers first - but don't stop there!
title: 每个程序员应该知道关于浮点的代数 description: Aims to provide both short and simple answers to the common recurring questions of novice programmers about floating-point numbers not 'adding up' correctly, and more in-depth information about how IEEE 754 floats work, when and how to use them correctly, and what to use instead when they are not appropriate. verification: SoYmbsJEmSz2s1LmZk_cku4pKwhRsU6m0ZOTgGdnTL0
比如你写了一些非常简单的代码，例如：
0.1 + 0.2
得到了完全意外的结果：
0.30000000000000004
你有可能在某个论坛寻求帮助，然后得到一个指向 有很多公式的长文章 ，但这个结果好像并不能帮你解决问题。
好吧，本网站就是：
- 简明解释为什么你得到了意外的结果
- 告诉你怎么处理这个问题
- 如果你感兴趣，本站也提供了深入的解释来说明为什么浮点数要这样工作，还有其他一些可能出现的问题
你应该首先看 基础答案 - 但你不应该在那里停下来！