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单选题
下面是重载为非成员函数的运算符函数原型,其中错误的是(  )。
A

Fraction operator+(Fraction,Fraction);

B

Fraction operator-(Fraction);

C

Fraction& operator=(Fraction&,Fraction);

D

Fraction& operator +=(Fraction&,Fraction);


参考答案

参考解析
解析:
C++语言规定,“=”运算符只能作为成员函数重载,不能作为非成员函数重载。
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