题目内容

如下程序声明了一个电话号码类PhoneNumber，重载了流插入运算符<<，以便于电话号码的输出。请将程序补充完整。#include#include#includeusing namespace std;class PhoneNumber{public: void setNumber(string number){this->number=number;}//重载流插入操作符 friend (ostream &output,const PhoneNumber &num) {output<

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