Assignemnt #74 and Safe Square Root

Code

    ///Name: Daniel Tiffany-Appleton
    ///Period: 7
    ///Program Name: Safe Square Root
    ///File Name: SafeSquareRoot
    ///Date Finished: 12/15/15
    
    import java.util.Scanner;
     
    public class SafeSquareRoot
    {
        public static void main( String[] args )
        {
            
            Scanner keyboard = new Scanner(System.in);
    
            int number;
            double root;
            
            System.out.println( "SQUARE ROOT!" );
            System.out.print( "Enter a number: " );
            number = keyboard.nextInt();
            
            while ( number < 0 )
            {
                System.out.println( "You can't take the square root of a negative number, silly." );
                System.out.print( "Enter a number: " );
                number = keyboard.nextInt();
            }
            
            root = Math.sqrt(number);
            
            System.out.println( "The square root of " + number + " is " + root + "." );
        }
    }
    

Picture of the output