A recursive function is a function that calls itself. Here is an example of such a function, including how to call it:

#include <cmath>

using namespace std;
using namespace System;

void Show(int Number)
{
    if( Number > 0 )
    {
		Console::WriteLine(L"Number: {0}", Number);
        Number--;
        Show(Number);
    }
}

int main()
{
    const double Nbr = 12.48;
    const double SquareRoot = sqrt(Nbr);

	Console::WriteLine(L"Square Root of {0} = {1}", Nbr, SquareRoot);
	Console::WriteLine(L"");
	Show(14);

    return 0;
}