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

[Jon Skeet [C# MVP]]

Magnus wrote:

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));
}
It doesn't look to me like that does anything that Math.Pow doesn't do.
The Math.Pow is the same method as the Delphi-method IntPow

No, it's not. Math.Pow copes with floating point exponents just fine.
Could you give an example where just using Math.Pow doesn't do what you
want it to? Here's an example showing Math.Pow giving the same answer
as MathPower for non-integral values:

using System;

class Test
{
static void Main()
{
Console.WriteLi ne (MathPower (15.2, 2.3));
Console.WriteLi ne (Math.Pow (15.2, 2.3));
}

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));
}
}

Jon