/**
 * SquareRootCalculator.java
 *
 * Computer Science S-111
 * 
 * Demonstrates the use of an if statement to handle invalid user inputs.
 */

import java.util.*;

public class SquareRootCalculator {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        
        System.out.print("enter a positive int: ");
        int num = console.nextInt();
        if (num < 0) {
            System.out.println("number is negative;" 
              + " using its absolute value");
            num = num * -1;
        }
        
        double sqrt = Math.sqrt(num);
        System.out.println("square root = " + sqrt);
    }
}