c# - 什么是 C# exclusive 或 `^` 用法？

Question

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Answer 1

它是逻辑操作exclusive disjunction的实现

http://en.wikipedia.org/wiki/Exclusive_or

Exclusive disjunction is often used for bitwise operations. Examples:

• 1 xor 1 = 0
• 1 xor 0 = 1
• 0 xor 1 = 1
• 0 xor 0 = 0
• 1110 xor 1001 = 0111 (this is equivalent to addition without carry)

As noted above, since exclusive disjunction is identical to addition modulo 2, the bitwise exclusive disjunction of two n-bit strings is identical to the standard vector of addition in the vector space (Z/2Z)^4.

In computer science, exclusive disjunction has several uses:

• It tells whether two bits are unequal.
• It is an optional bit-flipper (the deciding input chooses whether to invert the data input).
• It tells whether there is an odd number of 1 bits ( is true iff an odd number of the variables are true).

(以及一大堆其他用途)