4-6

#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()
	{
	 cout<<"("<<real<<"+"<<imag<<"i)"<<endl;
	}
private:
	double real;
	double imag;
};
int main()
{
 int i=2;
 Complex c1(2,4),c2;
 double d1;
 d1=2.5+c1;
 cout<<"d1="<<d1<<endl;
 c2=Complex(d1);
 cout<<"c2="<<c2.display<<endl;
 return 0;
}