// CSE 142, Summer 2008 (Helene Martin)
// Prompts the user for a non-negative integer and prints its square root.
// If negative numbers are given, re-prompt.

import java.util.*;

public class SquareRoot {
	public static void main(String[] args) {
		Scanner console = new Scanner(System.in);
		System.out.print("Type a non-negative integer: ");
		int num = console.nextInt();
		
		while(num < 0) {
			System.out.print("Invalid number, try again: ");
			num = console.nextInt();
		}
		
		System.out.println("The square root of " + num + " is " + Math.sqrt(num)); 
	}
}