#include
     
      #include
      
       using namespace std;class Complex {public:    Complex(double a= 0, double b= 0);    Complex(Complex &t);    void add(Complex x);    void show();    double mod();private:    double real, imaginary;};Complex::Complex(double a, double b) {    real = a;    imaginary = b;    if (imaginary == 0) cout << real << endl;    else cout << real << "+" << imaginary << "i" << endl;}Complex::Complex(Complex &t){    real = t.real;    imaginary = t.imaginary;}void Complex::add(Complex x){    real = x.real + real;    imaginary = x.imaginary + imaginary;}void Complex::show() {    cout << real << "+" << imaginary<< "i" << endl;}double Complex::mod() {    return sqrt(pow(real, 2) + pow(imaginary, 2));}int main(){    Complex c1(3, 5);    Complex c2(4.5);    Complex c3(c1);    c1.add(c2);    c1.show();    cout << c1.mod();    system("pause");    return 0;}
      
     

总结：在课堂上没有写void add(Complex x);void show();double mod();说明对程序还是不熟悉，做的时候还是要请教同学才能写出来。