处理一个复数于double数相加的运算

请编写程序，处理一个复数与一个double数相加的运算，结果存放在一个double型的变量d1中，输出d1的值，再以复数形式输出此值。定义Complex（复数）类，在成员函数中包含重载类型转换运算符：

operator double(){return real;}

 

#include<iostream>
using namespace std;
class Complex
{
public:
    Complex(){real=0;imag=0;}
    Complex(double r,double i){real=r;imag=i;}
    operator double(){return real;}
    Complex(double r){real=r;imag=0;}
    void display();
    double real;
    double imag;
};
void Complex::display()
{
    cout<<"( "<<real<<" , "<<imag<<" )";
}
double operator +(Complex &c1,double a)
{
    double b;
    b=c1.real+a;
    return b;
}

int main()
{
  Complex c1(3,2),c2;
  double a=2.5,b;
  b=c1+a;
  cout<<b<<endl;
  c2=b;
  c2.display();


}