public class ex4
{
  
  public static void main(String[] args)
  {
    double x = 2.0;
    double y = Math.sqrt(x);
    System.out.println("square root of " + x + " is " + y);
    System.out.printf("square root of %.1f is %.6f\n", x, y);
  }

}
Output:
square root of 2.0 is 1.4142135623730951
square root of 2.0 is 1.414214