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int c = a;
a = b;
b = c;

a = a^b;
b = a^b;
a = a^b;

of a=1 and b=0. 
a = a^b = 1 xor 0 = 1
b = a^b = 1 xor 0 = 1
a = a^b = 1 xor 1 = 0

mysql> select * from test;
+------+------+
...
2 rows in set (0.00 sec)

mysql>