【问题描述】定义一个复数类，使得下面的代码能够工作： Complex c1(3,5); Complex c2=4.5; c1.add(c2); c1.show(); 【输入形式】无 【输出形式】 c1=3 + 5i c2=4.5 + 0i c1+c2=7.5 + 5i

以下是复数类的实现代码：

#include <iostream>
using namespace std;

class Complex {
private:
    double real;    // 实部
    double imag;    // 虚部
public:
    Complex(double r = 0, double i = 0) : real(r), imag(i) {}
    Complex operator+(const Complex& c) const {
        return Complex(real + c.real, imag + c.imag);
    }
    void add(const Complex& c) {
        real += c.real;
        imag += c.imag;
    }
    void show() const {
        cout << real << " + " << imag << "i" << endl;
    }
};

int main() {
    Complex c1(3, 5);
    Complex c2 = 4.5;
    c1.add(c2);
    cout << "c1=";
    c1.show();
    cout << "c2=";
    c2.show();
    cout << "c1+c2=";
    (c1 + c2).show();
    return 0;
}

输出结果为：

c1=7.5 + 5i
c2=4.5 + 0i
c1+c2=12 + 5i