HW5.22

 1 import java.util.Scanner;
 2
 3 public class Solution
 4 {
 5     public static void main(String[] args)
 6     {
 7         Scanner input = new Scanner(System.in);
 8         System.out.print("Enter a number to calculate the sqrt: ");
 9         double number = input.nextDouble();
10
11         input.close();
12
13         System.out.println("The sqrt is " + sqrt(number));
14     }
15
16     public static double sqrt(double number)
17     {
18         double lastGuess = 1;
19         double nextGuess = (lastGuess + (number / lastGuess)) / 2;
20
21         while(Math.abs(nextGuess - lastGuess) > 0.0001)
22         {
23             lastGuess = nextGuess;
24             nextGuess = (lastGuess + (number / lastGuess)) / 2;
25         }
26
27         return nextGuess;
28     }
29 }