c++实现复数的加减乘除

以下是C++代码实现复数的加减乘除：

#include <iostream>
using namespace std;

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

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

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

    cout << "c1 = " << c1 << endl;
    cout << "c2 = " << c2 << endl;
    cout << "c1 + c2 = " << c1 + c2 << endl;
    cout << "c1 - c2 = " << c1 - c2 << endl;
    cout << "c1 * c2 = " << c1 * c2 << endl;
    cout << "c1 / c2 = " << c1 / c2 << endl;

    return 0;
}

其中，重载运算符 `+`、`-`、`*`、`/` 分别表示复数的加、减、乘、除。注意在除法运算中需要对分母做非零判断，以避免除数为零的情况。此外，为了方便输出复数，还重载了输出运算符 `<<`。