将字符串转换为数学计算 [英] Convert string to mathematical evaluation

问题描述

好的，所以我想做的是使用字符串作为输入（例如16 * 12 + 25），将其转换为计算机可以理解并返回评估值的数学计算。我可能自己写这个，但它很可能需要一段时间，最后，它仍然不会结束，我想要的，除非我想要更多的时间。

Okay, so what I want to do is to use a string as input (for instance "16*12+25"), convert it to a mathematical evaluation that the computer can comprehend and return the evaluated value. I could probably write this myself, but it would most likely take quite a while and in the end, it still wouldn't end up as good as I'd like it to unless I want to put even more time into it.

所以我的问题是，有没有任何脚本，库或api，你知道可以做这个C ++？我发现一些为java，python和.NET。但是我不使用任何这些语言，我想在C ++中保持尽可能长（希望贯穿整个项目）。你有什么好的想法或链接？

So my question is, is there any script, library or api that you know can do this for C++? I have found some for both java, python and .NET. But I am not working with any of these languages and I would like to remain within C++ for as long (hopefully throughout the entire project) as possible. Do you have any good ideas or links?

推荐答案

我发现我在找什么！可下载的源代码是C ++和CodeBlocks项目。您可以在这里找到： http://www.speqmath.com/tutorials/expression_parser_cpp/index.html

I found what I was looking for! The downloadable source is C++ and a CodeBlocks project. You can find it here: http://www.speqmath.com/tutorials/expression_parser_cpp/index.html

Jared推荐的一个更复杂的表达式解析器： http://www.partow.net/programming/exprtk/index.html

A far more sophisticated expression parser recommended by Jared: http://www.partow.net/programming/exprtk/index.html

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