e1.cpp

一、教学目的： 能理解C++中运算符重载的需要性

#include<iostream.h>          

class RMB
{
public:
	RMB(double d){yuan=(int)d;jf=(int)((d-yuan)*100);}
	RMB interest(double rate);//计算利息
	RMB add(RMB d);//人民币加
	void display()
	{
		cout<<(yuan+jf/100.0)<<endl;
	}
private:
	unsigned int yuan;//元
	unsigned int jf;//角分
};
RMB RMB::interest(double rate)
{
	return RMB((yuan+jf/100.0)*rate);
}
RMB RMB::add(RMB d)
{
	return RMB(yuan+d.yuan+(jf+d.jf)/100.0);
}
RMB expense1(RMB principal,double rate)
{
	RMB interest=principal.interest(rate);//用函数实现
	return principal.add(interest);//用函数实现
}

void main()
{
	RMB x=10000.10;
	double yrate=0.035;
	expense1(x,yrate).display();
}