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//例子 :
/**
* 操作符重载*/
#include <iostream>
using namespace std;
class RMB{
private:
unsigned int yuan; //元
unsigned int jf; //角分
public:
RMB(double d){
yuan = static_cast<unsigned int> (d);
jf = static_cast<unsigned int> ((d-yuan)/100);
}
RMB interest(double rate);//计算利息
RMB add(RMB d);
void display(){
cout << (yuan + jf/100.0)<< endl;
}
RMB operator+ (RMB d){//人民币+运算符重载
return RMB(yuan + d.yuan + (jf + d.jf)/100);
}
RMB operator* (double rate){
return RMB( (yuan+jf/100) * rate);
}
};
RMB RMB::interest(double rate) {
return RMB((yuan + jf/100.0) * rate);
}
RMB RMB::add(RMB d){
return RMB(yuan + d.yuan + jf/100.0+ d.jf/100.0);
}
RMB expense1(RMB principle , double rate){
RMB interest= principle.interest(rate);
return principle.add(interest);
}
RMB expense2(RMB principle , double rate){
RMB interest = principle * rate;
return principle + interest;
}
int main(){
RMB x =10000.0;
double yrate=0.035;
expense1(x,yrate).display();
expense2(x,yrate).display();
return 1;
}
//以上代码在gcc mingw windows环境中编译通过
操作符重载注意事项 :
1 "." , "::" , ".*" , ".->" , "?:" 这5个操作符在c++标准中是不允许重载的,也不可以创造新的操作符
2 操作符在重载后运算优先级保持不变
3 重程序易读性上考虑,操作符重载尽量不要悖弃操作符的本意
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