Different from other languages, the XOR of C language and C++ language does not use xor, but "^", and the typing method is Shift+6. (while "^" in other languages generally means power)
If it is necessary to exchange the values of two variables, in addition to the usual borrowing of intermediate variables for exchange, XOR can also be used to exchange only two variables, such as:
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1
2
3
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a=a^b;
b=b^a;
a=a^b;
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Detailed explanation:
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1
2
3
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a1=a^b
b=a1^b
a=a1^b=a1^(a1^b)=a1^a1^b=b
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gather:
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1
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a=a^b^(b=a);
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This completes the exchange of a and b.
To sum up: the same variable is XORed with another variable and its XOR value is equal to itself.
Use case: It can be used in one or more links of the encryption algorithm to make the algorithm more complex, difficult to be cracked, and more secure.