import java.util.Scanner;

public class ReturnEx {

    // methods with main need to be public static like main
    
    
    public static double sumDouble(int a, int b) {
        double sd = (a + b) * 2.0;
        return sd;
    }

    public static String pickNameMultiReturn() {
        String user = promptString("Name? ");

        if (!user.equals("")) {
            return user;
        } else {
            return "No Name Given";
        }
    }

    public static String pickNameOneReturn() {
        String user = promptString("Name? ");

        if (user.equals("")) {
            user = "No Name Given";
        }
        return user;
    }

    public static int[] doubleIt(int[] list) {
        int[] list2 = new int[list.length];
        for (int i = 0; i < list.length; i++) {
            list2[i] = 2 * list[i];
        }
        return list2;
    }

    public static boolean even(int x) {
        return x % 2 == 0;
    }

    public static int findOdd(int x) {
        while (even(x)) {
            x = x / 2;
        }
        return x;
    }

    public static int[] oddify(int[] list) {
        int[] oddList = new int[list.length];
        for (int i = 0; i < list.length; i++) {
            oddList[i] = findOdd(list[i]);
        }
        return oddList;
    }

    public static void main(String[] args) {

        double result = sumDouble(2, 3);

        System.out.println(sumDouble(1, (int) sumDouble(1, 5)));
        sumDouble(2, 2); // not an error, but useless

        int[] nums = {1, 3, 5, 7, 9};
        int[] dubNums = doubleIt(nums);

    }
    
    
        
    // utility for reading in String input
    public static String promptString(String promptText) {
        System.out.print(promptText + " ");
        Scanner scan = new Scanner(System.in);
        String response = scan.nextLine();
        return response;
    }
}