Frexp from Managed Code

[JackRazz]

Is it possible to call frexp (or an equivalent .NET framework function) to extract
the mantissa and exponent from a double using C#. I don't know anything about C++,
so I'm hoping someone can let me know calling frexp is possible. If this is
available in the framework as a managed function, which library is it in? I suppose
its possible to use a DllImport( .......), but im not sure if this could turn out to
be expensive from a cpu perspective.

I posted a question in the c# form about this, but got no answers, so my apologies
for asking such a newbie question here.

Thanks - JackRazz