Newton raphson method to find square root

Newton raphson method

public class SqrtDemo {

     static double sq_root(double x)
  {
        double rt = 1, ort = 0;
        while(ort!=rt)
        {
              ort = rt;
            rt = ((x/rt) + rt) / 2;
        }
        return rt;
  }
  public static void main(String[] args){

                int n = args.length;
    
    if(n != 1) {
  
      System.out.println("expected one arguments");
      return;
    }

    double pr = Double.parseDouble(args[0]);
        
        
    double temp = sq_root(pr);

    System.out.println(temp);

  

  
  }





}