Cracking the interivew 19.1

gistfile1.txt

//Java is not working ??? pass by value??
public class Question191
{
  public static void swap(int a, int b) {
    a = a ^ b;
    b = a ^ b;
    a = a ^ b;
  }
  
  public static void main(String[] args) {
    int a = 2; 
    int b = 3;
    //Question191 test1 = new Question191();
    
    System.out.println("a, b = " + a +", " +  b);
    swap(a, b);
    System.out.println("After swap, a, b = " + a +", " + b);
    
  }
}

//C++ code is working
#include <iostream>
using namespace std;

int main(int argc, char *argv[])
{
    int a = 2;
    int b = 3;

    a = a - b;
    b = b + a;
    a = b - a;

    cout << "a = " << a << endl;
    cout << "b = " << b << endl;

    return 0;

}