Compiler error: must take exactly one argument
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用成员方式重载运算符, 不能改变参数的个数 ，二元运算符用成员重载时, 只需要一个参数, 另一个参数由this指针传入 。如果需要两个参数，那么可以在类外面定义，然后在类里声明为友元。
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