如何将字符串字段计算为双精度. [英] How to calculate string fields as double.

问题描述

我有

String res="120*10-50%5";

答案是230.

如何将其解析为double?
我该如何计算?

请帮助我.

The answer is 230.

How can I parse this as double?
How can I calculate this?

Please help me.

推荐答案

您正在寻找的是算术评估函数.

在SO处查看此问题和答案； http://stackoverflow.com/questions/4173623/mathematical-expression-string- to-number-in-java [ ^ ]

有很多关于此的文章，如果您只是四处搜索，也可以使用库.

What you are looking for is Arithmetic Evaluation functions.

See this question and answers over at SO; http://stackoverflow.com/questions/4173623/mathematical-expression-string-to-number-in-java[^]

There are various articles for this and also libraries you could use if you just search around.

看看这篇很棒的CodeProject文章:
通过在运行时编译C#代码来评估数学表达式 [使用muParser解析数学表达式 [ http://muparser.sourceforge.net/ [ ^ ]

Have a look at this great CodeProject article:
Evaluating Mathematical Expressions by Compiling C# Code at Runtime[^]
or this library:
Parsing Mathematical Expressions with muParser[^]
http://muparser.sourceforge.net/[^]

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