Managed C++/CLI

#using <mscorlib.dll><br />
using namespace System;<br />
public __delegate Int32 FactorialCallback(Int32,Int32*);<br />
public __gc class Factorial{<br />
public:<br />
FactorialCallback *fc;<br />
Factorial(){<br />
	this->fc=new FactorialCallback(this, GetFactorial);<br />
}<br />
Int32 GetFactorial(Int32 iSeed, Int32 *iNumberOfCircles){<br />
		(*iNumberOfCircles)++;<br />
		return (iSeed==0)?1:(GetFactorial(iSeed-1,iNumberOfCircles)*iSeed);<br />
	}<br />
Void FactorialComplete(IAsyncResult *ar){<br />
	Int32 iNumberOfCircles;<br />
	Int32 iResult=this->fc->EndInvoke(&iNumberOfCircles,ar);<br />
	Console::WriteLine(S"The result is {0}, nuber of circles is {1}",iResult.ToString(),(iNumberOfCircles-1).ToString());<br />
	Console::Read();<br />
}<br />
};<br />
<br />
int _tmain()<br />
{<br />
   Factorial *fact=new Factorial();<br />
   Int32 dummy=0;<br />
   AsyncCallback *ac=new AsyncCallback(fact,&Factorial::FactorialComplete);<br />
   fact->fc->BeginInvoke(5,&dummy,ac,NULL);<br />
   Console::WriteLine(S"Main complete");<br />
   Console::Read();<br />
<br />
	return 0;<br />
}