用运算符重载设计复数类，实现复数的+、-、*、/运算。

好的，我可以给您提供一个样例代码：

#include<iostream>
using namespace std;

class Complex{
public:
    Complex(){
        real = 0;
        imag = 0;
    }
    Complex(double r, double i){
        real = r;
        imag = i;
    }
    Complex operator+(const Complex& c2){
        Complex temp(real+c2.real, imag+c2.imag);
        return temp;
    }
    Complex operator-(const Complex& c2){
        Complex temp(real-c2.real, imag-c2.imag);
        return temp;
    }
    Complex operator*(const Complex& c2){
        Complex temp(real*c2.real - imag*c2.imag, real*c2.imag + imag*c2.real);
        return temp;
    }
    Complex operator/(const Complex& c2){
        double denominator = c2.real*c2.real + c2.imag*c2.imag;
        Complex temp((real*c2.real + imag*c2.imag)/denominator, (imag*c2.real - real*c2.imag)/denominator);
        return temp;
    }
    friend ostream& operator<<(ostream& os, const Complex& c);
private:
    double real;
    double imag;
};

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

int main(){
    Complex c1(2.0, 3.0);
    Complex c2(4.0, 5.0);
    Complex c3 = c1 + c2;
    Complex c4 = c1 - c2;
    Complex c5 = c1 * c2;
    Complex c6 = c1 / c2;
    cout << c1 << "+" << c2 << "=" << c3 << endl;
    cout << c1 << "-" << c2 << "=" << c4 << endl;
    cout << c1 << "*" << c2 << "=" << c5 << endl;
    cout << c1 << "/" << c2 << "=" << c6 << endl;
    return 0;
}

在这个例子中，我们定义了一个 Complex 类，包含了两个私有成员变量 real 和 imag，分别表示复数的实部和虚部。然后我们重载了 +、-、*、/ 四个运算符，实现了复数的加减乘除运算。我们还重载了输出运算符 <<，方便输出复数对象。最后在 main 函数中测试了我们定义的运算符重载是否正确。