squareroot java

//program to find square root of a number without using square root function
import java.util.Scanner;

public class squareRoot{

    public static void main(String arg[]){
        boolean cont = true;
        do{
            Scanner sc = new Scanner(System.in);
            //taking input from the user
            System.out.print("Enter the Number whose square root needs to be found out : ");
            double number = sc.nextDouble();

            // if the number is less than 0 then ask user to enter another number
            while(number < 0){
                System.out.println("Please enter a positive number");
                System.out.print("Enter the Number whose square root needs to be found out : ");
                number = sc.nextDouble();
            }

            // if the number is 0 or 1 then the answer is also is also 0 or 1
            if(number == 0 || number == 1){
                System.out.print("The square root of the number " + number + " is " + number + "\n\n");
                continue;
            }

            //else take initial guess from the user
            System.out.print("Enter the Initial guess : ");
            double sqroot = sc.nextInt();

            //taking mod of the guess so as to make it smaller than the square
            sqroot = sqroot % number;

            findroot(number,sqroot);
            System.out.print("Do you want to enter another number (1/0) : ");
            int n = sc.nextInt();
            if(n == 0){
                cont = false;
            }
        }while(cont);
    }

    public static void findroot(double number, double sqroot){

        // setting answer to be accurate upto 6 decimal places
        // change this to get more accuracy
        double error = 0.000001;

        // calculating num
        double num = number/sqroot;

        // till the difference is greater than error keep taking average
        while(((num < sqroot) && (sqroot - num > error)) || ((num > sqroot)&&(num - sqroot > error))){

            // taking average
            sqroot = (sqroot + num)/2;
            num = number/sqroot;

            // if num and sqroot are equal then we directly print the answer
            if(num == sqroot){
                break;
            }
        }
        System.out.print("The square root of the number " + number + " is " + sqroot + "\n\n");
    }
}