请重载复数类的流插入和流提取运算符，实现复数类的输出和输入。 #include<iostream> #include <string> using namespace std; //--------------------- class Complex { private: double real,imag; public: Complex(){ real=imag=0; } Complex(double r){ real=r;imag=0; } Complex(double r,double i){ real=r;imag=i; } // 在此处补充你的代码 int main() { Complex c; cin>>c; cout<<c; }

在此处给出复数类的流插入和流提取运算符的实现：

#include<iostream>
#include <string>

using namespace std;

class Complex {
private:
    double real,imag;
public:
    Complex() {
        real = imag = 0;
    }
    Complex(double r) {
        real = r;
        imag = 0;
    }
    Complex(double r, double i) {
        real = r;
        imag = i;
    }

    friend istream& operator>>(istream& is, Complex& c) {
        is >> c.real >> c.imag;
        return is;
    }

    friend ostream& operator<<(ostream& os, const Complex& c) {
        os << "(" << c.real << ", " << c.imag << "i)";
        return os;
    }
};

int main() {
    Complex c;
    cin >> c;
    cout << c;
    return 0;
}

在以上代码中，我们使用了 `friend` 关键字来声明流插入和流提取运算符的友元关系，这样就可以直接访问 `Complex` 类的私有成员变量。在流插入运算符中，我们输出复数的实部和虚部；在流提取运算符中，我们从输入流中读取两个浮点数，分别为复数的实部和虚部。