第四章t6

#include <iostream>
using namespace std;
class Complex
{public:
Complex(){real=0;imag=0;}
Complex(double r){real=r;imag=0;}
Complex(double r,double i){real=r;imag=i;}
operator double(){return real;}
void display();
private:
double real;
double imag;
};

void Complex::display()
{cout<<"("<<real<<", "<<imag<<")"<<endl;}

int main()
{Complex c1(2,0),c2;
double d1;
d1=2.5+c1;
cout<<"d1="<<d1<<endl;
c2=Complex(d1);
cout<<"c2=";
c2.display();
return 0;
}