1. 类的定义，构造函数，成员函数 2．两个复数运算的运算符重载.重载 +、-、*、/、++、--、<<、>>等运算符 3. double型数可以转换成复数

好的，我会记住您的要求，下面是回答您的问题： 1. 类的定义： ```cpp class Complex{ private: double real; double imag; public: Complex(double r = 0.0, double i = 0.0):real(r), imag(i){} //构造函数 Complex(const Complex& c){real = c.real; imag = c.imag;} //复制构造函数 Complex& operator=(const Complex& c){real = c.real; imag = c.imag; return *this;} //赋值运算符重载 Complex operator+(const Complex& c)const{return Complex(real+c.real, imag+c.imag);} //加法运算符重载 Complex operator-(const Complex& c)const{return Complex(real-c.real, imag-c.imag);} //减法运算符重载 Complex operator*(const Complex& c)const{return Complex(real*c.real-imag*c.imag, real*c.imag+imag*c.real);} //乘法运算符重载 Complex operator/(const Complex& c)const{ double denominator = c.real*c.real + c.imag*c.imag; return Complex((real*c.real+imag*c.imag)/denominator, (imag*c.real-real*c.imag)/denominator); //除法运算符重载 } Complex& operator++(){ //前置++运算符重载 ++real; return *this; } Complex operator++(int){ //后置++运算符重载 Complex c(*this); real++; return c; } Complex& operator--(){ //前置--运算符重载 --real; return *this; } Complex operator--(int){ //后置--运算符重载 Complex c(*this); real--; return c; } friend istream& operator>>(istream& in, Complex& c){ //输入运算符重载 in >> c.real >> c.imag; return in; } friend ostream& operator<<(ostream& out, const Complex& c){ //输出运算符重载 out << c.real << "+" << c.imag << "i"; return out; } operator double(){return real;} //double型转换成复数运算符重载 }; ``` 2. 复数运算符重载： ```cpp Complex operator+(const Complex& c1, const Complex& c2){return c1 + c2;} Complex operator-(const Complex& c1, const Complex& c2){return c1 - c2;} Complex operator*(const Complex& c1, const Complex& c2){return c1 * c2;} Complex operator/(const Complex& c1, const Complex& c2){return c1 / c2;} Complex& operator++(Complex& c){return ++c;} Complex operator++(Complex& c, int){return c++;} Complex& operator--(Complex& c){return --c;} Complex operator--(Complex& c, int){return c--;} ostream& operator<<(ostream& out, const Complex& c){out << c; return out;} istream& operator>>(istream& in, Complex& c){in >> c; return in;} ``` 3. double型转换成复数： ```cpp Complex(double r = 0.0, double i = 0.0):real(r), imag(i){} Complex(double r):real(r), imag(0){} ``` 以上是对您的问题的回答，希望能够帮到您！