The algorithm initially writes a recursive static method to compute ln (n!) The value

Directly using the Math library public
static double log (double A)

Returns the natural logarithm (base e) of a double value. Special Cases:if The argument is a nan or less than zero and then the result is Nan. If The argument is positive infinity and then the result is positive infinity. If The argument is positive zero or negative zero and then the result is negative infinity.

The computed result must be within 1 ULP of the exact result. Results must be semi-monotonic. Parameters:a-A value returns:the value ln A, the natural logarithm of a.

public static double Logn (double n)
	{
		if (N = = 0 | | N = = 1) return 0.0;  The factorial of 0 and the factorial of 1 are 1
		else {
			return Math.log (N) +logn (N-1);}
		
	}