// Zorah Fung, CSE 142
// An example of value versus reference semantics.
import java.util.*;

public class ValueReferenceSemantics {
	public static void main(String[] args) {
		int a = 7;
		int b = 35;
      swap(a, b);
      System.out.println("a = " + a + ", b = " + b); // Values will not be swapped
      
      int[] array = {11, 42, -5, 27, 0, 89};
      reverse(array);
      System.out.println(Arrays.toString(array)); // Modifications to the array will appear in main
   }
   
   // Swaps values a and b. Because of value semantics, these changes will
   // not be seen outside of this method.
   public static void swap(int a, int b) {
      int temp = a;
      a = b;
      b = temp;
   }
   
   // Reverses the given array
   // Note: Because of reference semantics, a reference to an array is passed and
   // modifications to the array can be seen outside of this method and thus an array 
   // does not need to be returned.
   public static void reverse(int[] a) {
      for (int i = 0; i < a.length / 2; i++) {
         int temp = a[i];
         a[i] = a[a.length - 1 - i];
         a[a.length - 1 - i] = temp;
      } 
   }
}