// Helene Martin, CSE 142
// Demonstrates use of arrays.

import java.util.*;

public class ArrayDemo {
   public static void main(String[] args) {
      int[] scores = new int[10];
      scores[0] = 78;
      scores[4] = 68 / 2 + 3;
      scores[5] = 12;
      
      System.out.println(scores[4]);
      System.out.println(scores[6]);
      // System.out.println(scores[10]); ArrayIndexOutOfBoundsException !
      
      // array traversal (visiting each element)
      for (int i = 0; i < scores.length; i++) {
         System.out.println("Value at " + i + ": " + scores[i]);
      }
      
      // String[] groceries = new String[4];
      // groceries[0] = "bananas";
      // ... this is tedious so we prefer quick initialization:
      String[] groceries = {"bananas", "cucumbers", "apples", "steak"};
      System.out.println(Arrays.toString(groceries));
      Arrays.sort(groceries);
      System.out.println(Arrays.toString(groceries));  
      
      int total = sum(scores);
      System.out.println(total); 
      
      
      // Use jGRASP's debugger to see what these look like
      boolean[] wins = new boolean[7]; // default: false
      String[] names = new String[9];  // default: null (no reference)
      names[0] = "Sally"; // sets the first reference
      Scanner[] scanners = new Scanner[10]; // default: null (for all object types)   
   }
   
   // Computes and returns the sum of all values
   // in the specified integer array.
   public static int sum(int[] arr) {
      int total = 0;
      for (int i = 0; i < arr.length; i++) {
         total += arr[i];
      }
      
      return total;
   }
}