如何使用C＃中的System.Data.Compute（）计算sin

Question

I'm new here! I'm a newbie in C#. One of my friends challenged me to create scientific calculator. I searched and found an easy way to make it here - using the System.Data library. For an example we have this:

string math = "5 + 3 * 3";
string answer = new DataTable().Compute(math, null).ToString();

This worked pretty easy with basic expressions, but I can't seem to find a way how to make the calculator be able to calculate sin, cos etc Anybody has an idea?

PS: I'm not good in english so plz forgive me

Answer 1

Thanks to Mat J for telling me about mXparser! I found a way of calculating through it without changing alot of code!

Here is the mXparser: http://mathparser.org/

This is how the code has changed: It was:

string math = "5 + 3 * 3";
string answer = new DataTable().Compute(math, null).ToString();

Now it is:

string math = "5 + 3 * 3";
Expression e = new Expression(math);
math = e.calculate();

The only thing is that it works with Expressions instead of strings, but it still works really easy and simple!

I want to thanks for the fast answers of everybody! You really helped me out!

Answer 2

Have a look at the Math Class, but something like this should work for you

    string math = "5 + 3 * 3";
    string answer = new DataTable().Compute(math, null).ToString();
    answer = Math.Sin(Convert.ToDouble(answer)).ToString();

Answer 3

    You can use the System.Math library. But System.Data library is related to ado.net operation. 
Example:
    string input=90
    var output =System.Math.Sin(Convert.ToDouble(input))); 
    output =System.Math.Cos(Convert.ToDouble(input)));