6月10日 C++day5

#include <iostream>

using namespace std;
class RMB
{
    friend const RMB operator+(const RMB &p1, const RMB &p2);
    friend const RMB operator-(const RMB &p1, const RMB &p2);
    friend bool operator>(const RMB &p1, const RMB &p2);
    friend RMB &operator--(RMB &other);
    friend const RMB operator--(RMB &other, int);
private:
    int yuan;
    int jiao;
    int fen;
    static int count;
public:
    //无参构造
    RMB(){count++;}
    //有参构造
    RMB(int yuan,int jiao,int fen):yuan(yuan),jiao(jiao),fen(fen){count++;}
    //拷贝构造
    RMB(const RMB &other):yuan(other.yuan),jiao(other.jiao),fen(other.fen){count++;}
    //析构函数
    ~RMB(){count--;}
    //静态成员函数
    static int Count(){return count;}
    void show()
    {
        cout << yuan << "元" << jiao << "角" << fen << "分" << endl;
    }
};
//静态变量初始化
int RMB::count=0;
//+运算符重载
const RMB operator+(const RMB &p1, const RMB &p2)
{
    RMB p;
    p.yuan = p1.yuan + p2.yuan;
    p.fen = p1.fen + p2.fen;
    p.jiao = p1.jiao + p2.jiao;
    return p;
}
//-运算符重载
const RMB operator-(const RMB &p1, const RMB &p2)
{
    RMB p;
    p.yuan = p1.yuan - p2.yuan;
    p.fen = p1.fen - p2.fen;
    p.jiao = p1.jiao - p2.jiao;
    return p;
}
//>运算符重载
bool operator>(const RMB &p1, const RMB &p2)
{
    if(p1.yuan*100+p1.jiao*10+p1.fen > p2.yuan*100+p2.jiao*10+p2.fen)
    {
        return true;
    }
    else
    {
        return false;
    }
}
//前自减运算符重载
RMB &operator--(RMB &other)
{
    --other.yuan;
    --other.jiao;
    --other.fen;
    return other;
}
//后自减运算符重载
const RMB operator--(RMB &other, int)
{
    RMB p;
    p.yuan = other.yuan--;
    p.jiao = other.jiao--;
    p.fen = other.fen--;
    return p;
}
int main()
{
    RMB r1(1,1,1);
    RMB r2(2,2,2);
    cout << "=======加法=====" << endl;
    RMB r3 = r1 + r2;
    r3.show();
    cout << "=======减法=====" << endl;
    RMB r4 = r1 - r2;
    r4.show();
    cout << "=======大于=====" << endl;
    if(r3 > r4){cout << "true" << endl;}
    cout << "=======前自减=====" << endl;
    RMB r5 = --r4;
    r4.show();
    r5.show();
    cout << "=======后自减=====" << endl;
    RMB r6=r5--;
    r5.show();
    r6.show();
    cout << "===RMB对象个数====" << endl;
    cout << "RMB对象个数:" << RMB::Count() << endl;
    return 0;
}