Assignment #74 and Safe Square Root

Code

    /// Name: Lauren Baird
    /// Period: 7
    /// Program Name: Safe Square Root
    /// File Name: SafeSquareRoot.java
    /// Date Finished: 11/12/2015
    
    import java.util.Scanner;
    
    public class SafeSquareRoot
    {
        public static void main( String[] args )
        {
            Scanner keyboard = new Scanner(System.in);
    
            int n;
            
            System.out.println();
            System.out.println( "SQUARE ROOT!" );
            System.out.print( "Enter a number: " );
            n = keyboard.nextInt();
                
            while ( n < 0 ) 
            { 
                System.out.println( "You can't take the square root of a negative number." );
                System.out.print( "Try again: " );
                n = keyboard.nextInt();
            }
            
            System.out.println( "The square root of " + n + " is " + Math.sqrt(n) + "." );
            System.out.println();
        }
    }