Swap two integer variables

I know three solutions, comment if you know more 🙂

Solution 1:

x = x+y;
y  = x-y;
x  = x-y;

Solution 2:

y = 2*((x+y)/2) – (x =y);

Solution 3:

x = x^y;
y = x^y;
x = x^y;

Note: However solution 1 & 2 has problem of overflow doing addition of two integers might overflow. But solution 3 will not have any such problem