lt15.cpp

一、教学目的： 能理解C++中运算符重载的需要性

#include<iostream.h>
#include<iomanip.h>
class RMB
{
public:
	RMB(double v=0.0)
	{
		yuan=v;//yuan得到V的整数部分
		jf=(v-yuan)*100.0+0.5;
	}
	operator double()
	{return yuan+jf/100.0;
	}
	void display(ostream& out)
	{
		out<<yuan<<'.'
			<<setfill('0')<<setw(2)<<jf//如:8分显示08
			<<setfill(' ');
	}
protected:
	unsigned int yuan;
	unsigned int jf;
};
ostream& operator<<(ostream& oo,RMB& d)
{
	d.display(oo);
	return oo;
}
void main()
{
	RMB rmb(1.5);
	cout<<"initially rmb="<<rmb<<"\n";
	rmb=2.0*rmb;
	cout<<"then rmb="<<rmb<<"\n";
}