class RMB
{
private:
    int yuan;
    int jiao;
    int fen;
    bool mark;
public:
    RMB(double money)
    {
        int money1 = int(money * 100);
        yuan = money1 / 100;
        fen = money1 % 10;
        jiao = (money1 - yuan * 100 - fen)/10;
        if (money < 0) mark = 0;
        else mark = 1;
    }
    operator double()
    {
        double money = yuan + double(jiao) / 10 + double(fen) / 100;
        if (mark == false) return -money;
        return money;
    }
};
int main()
{
    RMB a(1,2,3);RMB b(2,3,4);
cout << "a + c = " << RMB(a + c) << endl;//assume I have override "<<" and ">>"

cout << "a - b = " << RMB(a - b) << endl;
}

a + c = 2 yuan 4 jiao 5 fen

a - b = -1 yuan -1 jiao 0 fen