如何决定使用什么

编程入门行业动态更新时间:2024-10-24 22:21:43

本文介绍了如何决定使用什么-双精度还是十进制?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述

可能重复: 十进制与双精度！-我应该使用哪个?何时使用?

我在交易软件中使用的是 double 类型的价格.我注意到有时会出现一些奇怪的错误.如果价格在点"之后包含4位数字(例如2.1234)，则会发生这种情况.

I'm using double type for price in my trading software. I've noticed that sometimes there are a odd errors. They occur if price contains 4 digits after "dot", like 2.1234.

当我从程序"2.1234"发送来的市价单显示为"2.1235".

When I sent from my program "2.1234" on the market order appears at the price of "2.1235".

我不使用十进制，因为我不需要极端"精度.我不需要将示例"2.00000000003"与"2.00000000002"区分开.我需要一个小数点后最多6位数字.

I don't use decimal because I don't need "extreme" precision. I don't need to distinguish for examle "2.00000000003" from "2.00000000002". I need maximum 6 digits after a dot.

问题是-线路在哪里?何时使用十进制?

The question is - where is the line? When to use decimal?

我应该对任何金融操作使用 decimal 吗?即使我只需要一个点后一位数字?(1.1 1.2等)

Should I use decimal for any finansical operations? Even if I need just one digit after the dot? (1.1 1.2 etc.)

我知道 decimal 相当慢，因此除非绝对需要 decimal ，否则我宁愿使用 double .

I know decimal is pretty slow so I would prefer to use double unless decimal is absolutely required.

推荐答案

在处理要(并且可以)以10为基数表示的数量时，请使用小数.这包括货币值，因为您希望将2.1234精确表示为2.1234.

Use decimal whenever you're dealing with quantities that you want to (and can) be represented exactly in base-10. That includes monetary values, because you want 2.1234 to be represented exactly as 2.1234.

当您不需要以10为基数的精确表示形式时，请使用double.通常，这对于处理测量值很有好处，因为这些已经是近似值，而不是精确的数量.

Use double when you don't need an exact representation in base-10. This is usually good for handling measurements, because those are already approximations, not exact quantities.

当然，如果对您而言，以10为基数的确切表示形式对您而言并不重要，则可以考虑其他因素，具体取决于具体情况，这些因素可能无关紧要:

Of course, if having or not an exact representation in base-10 is not important to you, other factors come into consideration, which may or may not matter depending on the specific situation: