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SafeSquareRoot.java
import java.util.Scanner; public class SafeSquareRoot { public static void main( String[] args ) { Scanner keyboard = new Scanner(System.in); int n; System.out.println( "SQUARE ROOT!" ); System.out.print( "Enter a number: " ); n = keyboard.nextInt(); double sr = Math.sqrt(n); while ( n <= 0 ) { System.out.println( "You can't take the square root of a negative number, silly." ); System.out.print( "Try again: " ); n = keyboard.nextInt(); sr = Math.sqrt(n); } System.out.println( "The square root of " + n + " is " + sr + "." ); } }
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