//Compute the square root "by hand"

import tio.*;

public class SquareRoot
{  
	public static void main(String[] args) {  

		System.out.println("Please enter a number:");
		double a = Console.in.readDouble();

		double xnew = a / 2;
		double xold;

		do {
			xold = xnew;
			xnew = (xold + a / xold) / 2;
			System.out.println(xnew);

		//Test for equality between two doubles
		} while (Math.abs(xnew - xold) > 1E-4);

		System.out.println("\nSqrt is: " + xnew);
	}
}