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Math line for a program (Cube Root)

Posted on 1997-10-11
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Last Modified: 2006-11-17
I'm creating a program in D2.  a math Equation is going to be used to figerout the Volum to Surfase Area of of an Object.  The book that I'm using has the following Math.
Surfase Area =[(cube root of volume) squared] x 6

Is there a command in D2 that calculates the cube root or do I have to find an nother way.

If there is no command, please supply code to add.   willing to give the points.

Thanks
PPaul
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Question by:PPaul
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6 Comments
 
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Accepted Solution

by:
ronit051397 earned 800 total points
ID: 1347285
procedure TForm1.Button1Click(Sender: TObject);
function Root(FSurface, FDegree: Real): Real;
begin
  Result:=Exp(1/FDegree*Ln(FSurface));
end;

begin
  ShowMessage(FloattoStr(Root(50,6)));
end;

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Expert Comment

by:AllenC
ID: 1347286
function GetSurfaceArea(Volume: Real): Real;
begin
  Result := Sqr( 1/Exp(3 * Ln(Volume)) ) * 6;
end;
0
 

Author Comment

by:PPaul
ID: 1347287
OK.  I looked at the above code..  The one by ronit lost me.  I'm trying to fuger out what's with the two varables.  they just shoot me for a loop. :)

The code by AllenC, I tryed in the program and the results are nowere close to the the one from the Gaming book I'm making this program for :)

Is the above code using CUBE ROOT or did you make the same mastake I did ,  SQUARE ROOT.

The book I have, has a chart with Surface area rounded up/down to the close number.  Example:

Volume          Area
  (cf)                (sf)
Under 0.03     0.5
0.03 - 0.06       1
Etc...

I need to get the cube root of the voloum then sqruare it then times it by 6 : [(cube root of volume) squared]x6

I have only one number to plug in to the math line that is Volume.

When I did test the code by AllenC  the result to 0.05 was realy off.  It sould have been around 1.  It gave me 383999999.999512.

Thanks for the help but I still need more.

ronit if you can can you discribe the steps the code is doing and why I need two numbers?  Thanks.

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Expert Comment

by:AllenC
ID: 1347288
Sorry, my mistake here. Try this code instead, it works, I tried it.

function GetSurfaceArea(Volume: Real): Real;
begin
  GetSurfaceArea := Exp( (1/3) * Ln(Volume)) * 6;
end;

begin
  Writeln(Round( GetSurfaceArea(27) ));
  { You should get 18 }
end.

Exp( (1/3) * Ln(Volume)) <- Cube Root of Volume.

Sorry about the error..

http://tcp.home.ml.org/
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LVL 5

Expert Comment

by:ronit051397
ID: 1347289
I will give you the most general function, so that it will answer any case, not just the 6'th case:

procedure TForm1.Button1Click(Sender: TObject);
function Root(FSurface, FDegree: Real): Extended;
begin
  Result:=Exp(FDegree*Ln(FSurface));
end;
begin
  ShowMessage(FloattoStr(Root(5,2)));//equel to 5²
  ShowMessage(FloattoStr(Root(16,1/4)));//equel to 16¼
end;

And In general:          
Root(X, a)=Xª
SQRT(25)=Root(25, 1/2)=25½

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Author Comment

by:PPaul
ID: 1347290
Thanks.  Big Help!
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