/**************************************************
*   Author: Morrison
*   Date created: 3 Sep 2020
*   Date last modified: 3 Sep 2020
**************************************************/
import java.util.ArrayList;
public class TestConditional
{
    //static service class
    private TestConditional()
    {
    }
    
    //absolute value function
    public static int abs(int x)
    {
        return x >= 0? x: -x;
    }
    //returns 0 if x is 0, 1 if x > 0, -1 if x < 0
    public static int sgn(int x)
    {
        if(x > 0)
        {
            return 1;
        }
        if(x < 0)
        {
            return -1;
        }
        return 0;
    }
    //returns true if item resides at an even index in list.
    //this is a generic function.  They can be very cool.
    public static <T> boolean isAtEvenIndex(ArrayList<T> list, T item)
    {
        for(int k = 0; k < item.size(); k += 2)
        {
            if(list.get(k).equals(item))
            {
                return true;
            }
        }
        return false;
    }

    public static void main(String[] args)
    {
        System.out.println("Testing abs********");
        int x = 5;
        int expected = 5;
        System.out.printf("Case %s: %s\n", x, abs(x) == expected);
        x = -5;
        expected = 5;
        System.out.printf("Case %s: %s\n", x, abs(x) == expected);
        x = 0;
        expected = 0;
        System.out.printf("Case %s: %s\n", x, abs(x) == expected);
        System.out.println("Testing sgn********");
        x = 5;
        expected = 1;
        System.out.printf("Case %s: %s\n", x, sgn(x) == expected);
        x = -5;
        expected = -1;
        System.out.printf("Case %s: %s\n", x, sgn(x) == expected);
        x = 0;
        expected = 0;
        System.out.printf("Case %s: %s\n", x, sgn(x) == expected);
        ArrayList<String> foo = new ArrayList<>();
        foo.add("cat");
        foo.add("dog");
        foo.add("elephant");
        //String s = "cat";
        //System.out.printf("Case %s: %s\n", s, isAtEvenIndex(foo, s));
        //String s = "dog";
        //System.out.printf("Case %s: %s\n", s, !isAtEvenIndex(foo, s));
        //String s = "heffalump";
        //System.out.printf("Case %s: %s\n", s, !isAtEvenIndex(foo, s));

    }
}