處理一個複數於double數相加的運算

請編寫程序，處理一個複數與一個double數相加的運算，結果存放在一個double型的變量d1中，輸出d1的值，再以複數形式輸出此值。定義Complex（複數）類，在成員函數中包含重載類型轉換運算符：

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();


}