1. 定义一个复数类，请完成复数加运算、减运算、乘运算、除运算、以及赋值运算操作符的重载。

好的，以下是一个简单的复数类的定义，包括了加、减、乘、除、赋值运算符的重载：

#include <iostream>
using namespace std;

class Complex {
public:
    Complex(double r = 0.0, double i = 0.0) : real(r), imag(i) {}
    Complex operator+(const Complex& c2) const; // 加法运算符重载
    Complex operator-(const Complex& c2) const; // 减法运算符重载
    Complex operator*(const Complex& c2) const; // 乘法运算符重载
    Complex operator/(const Complex& c2) const; // 除法运算符重载
    Complex& operator=(const Complex& c2); // 赋值运算符重载
    void print() const { cout << "(" << real << ", " << imag << ")"; }
private:
    double real, imag;
};

Complex Complex::operator+(const Complex& c2) const {
    return Complex(real + c2.real, imag + c2.imag);
}

Complex Complex::operator-(const Complex& c2) const {
    return Complex(real - c2.real, imag - c2.imag);
}

Complex Complex::operator*(const Complex& c2) const {
    return Complex(real * c2.real - imag * c2.imag, imag * c2.real + real * c2.imag);
}

Complex Complex::operator/(const Complex& c2) const {
    double r = c2.real * c2.real + c2.imag * c2.imag;
    return Complex((real * c2.real + imag * c2.imag) / r, (imag * c2.real - real * c2.imag) / r);
}

Complex& Complex::operator=(const Complex& c2) {
    real = c2.real;
    imag = c2.imag;
    return *this;
}

int main() {
    Complex c1(1, 2);
    Complex c2(3, 4);

    Complex c3 = c1 + c2;
    c3.print(); // (4, 6)

    Complex c4 = c1 - c2;
    c4.print(); // (-2, -2)

    Complex c5 = c1 * c2;
    c5.print(); // (-5, 10)

    Complex c6 = c1 / c2;
    c6.print(); // (0.44, -0.08)

    Complex c7;
    c7 = c2;
    c7.print(); // (3, 4)

    return 0;
}

在这个例子中，我们用 `Complex` 类来表示复数，其中包含了实部 `real` 和虚部 `imag`。我们重载了加、减、乘、除、赋值运算符，使得我们可以方便地对复数进行运算。