johnwallis.java

Produce a Java program to calculate the value of π in two different methods proposed by Francois Vie

class JohnWallis extends Estimation
{

	//----------------FIELDS-------------
	private double pi;

	//--------------CONSTRUCTOR-------------
	public JohnWallis(int newTermNo)
	{
		super(newTermNo);
	}
	//--------------METHOD-------------------
	public double calc_pi()
	{
		double tempValue = 1.0;
		
		for (int i = 1; i <= termNo; i++)
		{
			if (i % 2 == 0)
			{ tempValue = tempValue * i / (i + 1); }
			else
			{ tempValue = tempValue * (i + 1) / i; }
		}
		pi = 2 * tempValue;
		return (pi);
	}
}