为什么编译时说xi和yi都是未说明的标识符,#includeusing namespace std;class imaginary{public:\x05 imaginary(double a,double b)\x05 {\x05\x05 x=a;\x05\x05 y=b;\x05 }\x05 friend imaginary add(imaginary &i1,imaginary &i2);\x05 friend imagi

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