Delphi Power arithmetic function in C#

[Magnus]

I'm migrating an applicationf from Delphi5 to C# .net Framework 2.0,
but have some problems convertingt the Power function, because it is
not implemented in the framework Math library.
Does anyone have some code lines how to create an own Power function?

regards
Magnus

[Jeff]

I take it that Math.Pow wasn't able to do what you wanted?

[Magnus]

Nope, that is not the same function. I guess that the delphi Power
function does some logarithmic calculation...

[Doug Forster]

The Delphi source is in the Math.pas unit

Cheers
Doug Forster

"Magnus" <su*****@hotmai l.com> wrote in message
news:11******** **************@ t31g2000cwb.goo glegroups.com.. .

Nope, that is not the same function. I guess that the delphi Power
function does some logarithmic calculation...

[Jon Skeet [C# MVP]]

Magnus <su*****@hotmai l.com> wrote:

I'm migrating an applicationf from Delphi5 to C# .net Framework 2.0,
but have some problems convertingt the Power function, because it is
not implemented in the framework Math library.
Does anyone have some code lines how to create an own Power function?

For those of us who don't know Delphi, could you tell us what the Power
function actually does?

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[cody]

I think it should be the same as the Math.Pow() method.
"Jon Skeet [C# MVP]" <sk***@pobox.co m> schrieb im Newsbeitrag
news:MP******** *************** *@msnews.micros oft.com...

Magnus <su*****@hotmai l.com> wrote:

I'm migrating an applicationf from Delphi5 to C# .net Framework 2.0,
but have some problems convertingt the Power function, because it is
not implemented in the framework Math library.
Does anyone have some code lines how to create an own Power function?

For those of us who don't know Delphi, could you tell us what the Power
function actually does?

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Jon Skeet [C# MVP]]

cody <de********@gmx .de> wrote:

I think it should be the same as the Math.Pow() method.

That's what I'd have thought, but another post from Magnus suggested
that it wasn't what was required.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[scott blood]

Hello,

Being an old delphi programmer myself i can shed some light on this.

The power function, does exactly what is says on the box, it raises a number
to a power specified

P int;
P := Power(3, 2); // 9 - 3 * 3
P := Power(2, 3); // 8 - 2 * 2 * 2

And so on.

So using the Math.Pow() function as suggested does exactly what the delphi
function does.

Regards
Scott Blood
C# Developer

"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com...

cody <de********@gmx .de> wrote:

I think it should be the same as the Math.Pow() method.

That's what I'd have thought, but another post from Magnus suggested
that it wasn't what was required.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Jeff]

Magnus wrote:

Nope, that is not the same function. I guess that the delphi Power
function does some logarithmic calculation...

The delphi power function does the same thing using natural log and e^x
functionality. I would expect that C# does the same logic behing the
scenes. The result is the same.

[Magnus]

Thank you all, here is my c# contribution:

public static double MathPower(doubl e basenum, double exponent)
{
if(exponent == 0)
return 1;
else if(basenum == 0 && exponent > 0)
return 0;
else if((basenum - (int)basenum) == 0 && Math.Abs(expone nt)
<= int.MaxValue)
return Math.Pow(basenu m, (int)Math.Trunc ate(exponent));
else
return Math.Exp(expone nt * Math.Log(basenu m, Math.E));
}

The Math.Pow is the same method as the Delphi-method IntPow

/Magnus - Thanks to guys in a Delphi newsgroup, i found the source code
in math.pas