输入文本分析器，解析字符串以进行计算. [英] Input text analisator, parse string to function and calculate that.

问题描述

例如文本分析器，我们有输入字符串:"y =(x ^ 2)/2"，我们如何用任何一种语言(C ++，C#，C或Pascal)计算该值?

一些C ++原型:
...
对象=新的string_analisator_object-> set("y =(x ^ 2)/2");
...
双y = 0;
双x = 0;
...
当然我们知道这是一个"x":
...
数组参数= {(例如我们的x = 3.12)};
object-> set(params);
...
双重结果= object-> calculate();
...

所以，也许有人有解决方案?

Text analisator, for example we have input string: "y = (x^2)/2", how can we calculate that in any language(C++, C#, C or Pascal)?

Some C++ prototype:
...
object = new string_analisator_object->set("y = (x^2)/2");
...
double y = 0;
double x = 0;
...
Ofcourse we know that is a "x":
...
array params = { (for example our x = 3.12) };
object->set(params);
...
double result = object->calculate();
...

So, maybe anyone have solutions?

推荐答案

有很多选择:

• Google提供您喜欢的语言(例如
  )的即用型表达式评估器 快速搜索"C#中的表达式计算器"的结果 [ ^ ].
• 在您的应用程序中嵌入脚本语言(例如Lua).
• 编写您自己的用于评估表达式的算法.

There are many options:

• Google for a ready-to-go expression evaluator in your favourite language, e.g.
  result of a quick search for ''expression evaluator in C#''[^].
• Embed a script language (e.g. Lua) in your application.
• Write your own algorithm for evaluating expressions.

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