异或符号:^ 举例:5^2^3 1.转换二进制,5(0101),2(0010),3(0011);2.异或比较,二进制比较,相同为0,不同为1,5^2 = (0111) = 7;7^3 = (0100) = 4;3.结论:5^2^3 = 4;PS:用于检验回传数据,异或检验。