Help on System.Math 1

[rbri]

Hello Everyone

Could someone tell me how to use Trig. Functions in C#
the only thing I can find is using System.Math but I can't
figure out where it put it or how to use it. The only thing
I could find was that in the framework.net docs it says to
put "Imports System.Math" at the beginning of the program
but I must be doing something wrong because I cannot get it
to work. Thanks for any help.

Randy

 

[chiph]

Math is a class, not a namespace (it's actually part of the System namespace), so more than likely you don't have to reference/use any additional namespaces.

If you look at the member info for the Math class (ms-help://MS.VSCC/MS.MSDNVS/cpref/html/frlrfsystemmathmemberstopic.htm) you'll see a yellow "S" beside all the public methods. That means that you don't have instantiate (create an instance of) class Math in order to use them. They're "Static".

So the Pythagorean theorem would be:

double SideALength, SideBLength;
double HypotenuseLength;
SideALength = 3.0;
SideBLength = 4.0;
HypotenuseLength = Math.Sqrt((SideALength * SideALength) + (SideBLength * SideBLength));
If (double.IsNaN(HypotenuseLength) {
   // Something bad happened
}

Note that I'm using the static method "IsNaN" off the double class to determine if something went wrong in the square root method (you should always check return values).

Hope this helps.

Chip H.

 

[rbri]

That did the trick.
Thank you very much for your help

Randy