demo_operator_08_2.cpp

对于一个初涉VC＋＋的人来书

//************************************************
// 定义一个复数类,重载类型转换运算符为成员函数
// 以支持复数与double数想加的运算.
//************************************************

# include <iostream.h>

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(3,4),c2;
	double d1;

	d1=2.5+c1;
//	d1=2.5+double(c1);
	cout<<"d1="<<d1<<endl;

	c2=d1;
//	c2=Complex(d1);
	cout<<"c2=";
	c2.display();

	return 0;
}