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单选题
若要对类BigNumber中重载的类型转换运算符long进行声明，下列选项中正确的是（）。
A
operator long（）const；
B
operator long（bigNumber）；
C
long operator long（）const；
D
long operator long（BigNumber）；
参考答案
参考解析
解析：
在重载类型转换符时，由于运算符本身已经表示出返回值类型，因此不需要返回值类型的声明，CD两项错误。类型转换运算符只能作为成员函数重载，long是一元运算符，形参的个数比操作数个数少一个，因此重载函数无参数。
在重载类型转换符时，由于运算符本身已经表示出返回值类型，因此不需要返回值类型的声明，CD两项错误。类型转换运算符只能作为成员函数重载，long是一元运算符，形参的个数比操作数个数少一个，因此重载函数无参数。
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考题
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考题
单选题若要对类BigNumber中重载的类型转换运算符long进行声明，下列选项中正确的是（）。A
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考题
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