设计、定义并实现Complex类

#include<iostream>
#include<cmath>
#include<cstdlib>
using namespace std;
class Complex {
public:
    Complex(double newr = 0, double newi = 0);
    Complex(Complex &c1);
    void add(Complex c1);
    void show();
    double mod();
private:
    double real;
    double imaginary;
};
//构造函数
Complex::Complex(double newr/*=0*/, double newi/*=0*/) :real(newr), imaginary(newi) {}
//复制构造函数
Complex::Complex(Complex &c1) : real(c1.real), imaginary(c1.imaginary) {}
//复数相加
void Complex::add(Complex c1) {
    real += c1.real;
    imaginary += c1.imaginary;
}
//输出
void Complex::show() {
    if (imaginary != 0)
        cout << real << "+" << imaginary << "i" << endl;
    else
        cout << real << endl;
}
//取模
double Complex::mod() {
    return sqrt(real*real + imaginary * imaginary);
}
int main() {
    Complex c1(3,5);
    Complex c2 = 4.5;
    Complex c3(c1);
    Complex c4;
    c1.add(c2);
    cout << "c1=";
    c1.show();
    cout << "c2=";
    c2.show();
    cout << "c3=";
    c3.show();
    cout << "c4=";
    c4.show();
    cout << "c1.mod="<<c1.mod()<<endl;
    system("pause");
    return 0;
}