// Tyler Rigsby, CSE 142
// Several demos of using arrays

import java.util.*;

public class ArrayDemos {
    public static void main(String[] args) {
        int[] myList = {3, 5, 7};
        System.out.println(Arrays.toString(myList));
        
        int[] list2 = {3, 5, 7};
        System.out.println("== " + (myList == list2)); // doesn't work
        System.out.println(".equals " + myList.equals(list2)); // doesn't work
        System.out.println("Arrays.equals " + Arrays.equals(myList, list2)); // works!
        
        double[] values = {4.0, 6.0, 9.5};
        int result1 = indexOf(values, 6.0);
        int result2 = indexOf(values, 2.0);
        
        System.out.println("indexOf expected 1, got = " + result1);
        System.out.println("indexOf expected -1, got = " + result2);
        
        System.out.println(Arrays.toString(concatenate(myList, list2)));
    }
    
    // takes a double array and value as parameters and returns
    // the index of the first occurrence of the value in the list,
    // or -1 if it doesn't exist.
    public static int indexOf(double[] list, double val) {
        for (int i = 0; i < list.length; i++) {
            if (val == list[i]) {
                return i;
            }
        }
        return -1;
    }
    
    // returns the result of concatenating two arrays together
    public static int[] concatenate(int[] listA, int[] listB) {
        int[] result = new int[listA.length + listB.length];
        
        for (int i = 0; i < listA.length; i++) {
            result[i] = listA[i];
        }
        
        for (int i = 0; i < listB.length; i++) {
            result[listA.length + i] = listB[i];
        }
        
        return result;
    }
    
}