1:
a=a+b;
b=a-b;
a=a-b;
//in this case, if a or b is a very big number, a+b maybe will overflow.
2:
a=a^b;
b=a^b;
a=a^b;
1:
a=a+b;
b=a-b;
a=a-b;
//in this case, if a or b is a very big number, a+b maybe will overflow.
2:
a=a^b;
b=a^b;
a=a^b;
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1:
a=a+b;
b=a-b;
a=a-b;
//in this case, if a or b is a very big number, a+b maybe will overflow.
2:
a=a^b;
b=a^b;
a=a^b;
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