// Zorah Fung, CSE 142
// An example of using Arrays as parameters and returns in methods

import java.util.*; // to use the Arrays utility class

public class ArrayMethods {
   public static void main(String[] args) {
      int[] a = {42, 17, 30, 2};
      int[] b = {10, 51, 26};
      
      System.out.println("Sum of array a is: " + sum(a));
      System.out.println("a + b = " + Arrays.toString(concatenate(a, b)));
   }
   
   // Returns the sum of the values in the given array
   public static int sum(int[] a) {
      int sum = 0;
      for (int i = 0; i < a.length; i++) {
         sum += a[i];
      }
      return sum;
   }
   
   // Returns a new array representing the result of concatenating the given
   // a and b arrays
   public static int[] concatenate(int[] a, int[] b) {
      int[] result = new int[a.length + b.length];
      // Copy everything from a
      for (int i = 0; i < a.length; i++) {
         result[i] = a[i];
      }
      // Copy everything from b into the remainder of result
      for (int i = 0; i < b.length; i++) {
         result[a.length + i] = b[i];
      }
      return result;
   }
}