Math.Pow in .Net

Question

Well obviously I'm doing something wrong but I'm stuck so I hope you will be able to help me out.

I have this equation in Excel: =((247*(145/174)^3*60)/3600)*100
Result = 238.233

And I have tried this in .Net:

(Math.Pow(247.0 * (145.0 / 174.0), Convert.ToDouble(3*60)) / 3600.0) * 100; 

The problem is that C# returns a INF instead of the result and if I try to do this:

((long)Math.Pow(247.0 * (145.0 / 174.0), Convert.ToDouble(3*60)) / 3600.0) * 100;

The result does not match Excel.

Answer 1

I suspect you should write as below:

247.0*Math.Pow(145.0/174.0,3)*60/3600*100;

See the fiddle here: http://dotnetfiddle.net/B32N3B

this is because in excel operator ^ ( rise to power ) has precedence against to * so the intent of the excel line is to rise to 3 then multiply for 60 , not rise to 3*60 , that of course land to an overflow.