Swap two variable values

That’s the typical example when we’re all learning how to code, swap the values of a and b. Well, here’s what they probably taught us:

  1: int a = 4;
  2: int b = 3;
  3: int temp;
  4: //Swap
  5: temp = a;
  6: a = b;
  7: b = temp;

And here’s the way to do it with out using the temporary variable, with just boolean logic, and the ever underestimated XOR (^):

  1: int a = 4;
  2: int b = 3;
  3: //Swap
  4: a = a ^ b;
  5: b = a ^ b;
  6: a = a ^ b;

Another way, with just pluses and minuses…

  1: int a = 4;
  2: int b = 3;
  3: a -= b;
  4: b += a;
  5: a = b - a;

I’ve actually seen many ways to do it, specially on this thread