6.8 思维导图

#include <iostream>

using namespace std;

class RMB {
private:
	int yuan;
	int jiao;
	int fen;
	static int count;

public:
	RMB(int y = 0, int j = 0, int f = 0) : yuan(y), jiao(j), fen(f) { count++; }
	~RMB() { count--; }
	const RMB operator+(const RMB& rmb) const;
	const RMB operator-(const RMB& rmb) const;
	bool operator<(const RMB& rmb) const;
	bool operator>(const RMB& rmb) const;
	bool operator==(const RMB& rmb) const;
	bool operator>=(const RMB& rmb) const;
	bool operator<=(const RMB& rmb) const;
	bool operator!=(const RMB& rmb) const;
	RMB& operator++();
	const RMB operator++(int);
	RMB& operator--();
	const RMB operator--(int);

	static void printRMBInstanceCount() { cout << count << endl; }

	friend ostream& operator<<(ostream& os, const RMB& rmb) {
		os << "yuan: " << rmb.yuan << " jiao: " << rmb.jiao << " fen: " << rmb.fen;
		return os;
	}
};

int RMB::count = 0;
const RMB RMB::operator+(const RMB& rmb) const {
	return RMB(yuan + rmb.yuan, jiao + rmb.jiao, fen + rmb.fen);
}
const RMB RMB::operator-(const RMB& rmb) const {
	return RMB(yuan - rmb.yuan, jiao - rmb.jiao, fen - rmb.fen);
}

bool RMB::operator<(const RMB& rmb) const {
	int cvt2fen_1 = 100 * yuan + 10 * jiao + fen;
	int cvt2fen_2 = 100 * rmb.yuan + 10 * rmb.jiao + rmb.fen;
	return cvt2fen_1 < cvt2fen_2;
}

bool RMB::operator>(const RMB& rmb) const {
	int cvt2fen_1 = 100 * yuan + 10 * jiao + fen;
	int cvt2fen_2 = 100 * rmb.yuan + 10 * rmb.jiao + rmb.fen;
	return cvt2fen_1 > cvt2fen_2;
}

bool RMB::operator==(const RMB& rmb) const {
	int cvt2fen_1 = 100 * yuan + 10 * jiao + fen;
	int cvt2fen_2 = 100 * rmb.yuan + 10 * rmb.jiao + rmb.fen;
	return cvt2fen_1 == cvt2fen_2;
}

bool RMB::operator>=(const RMB& rmb) const {
	return !operator<(rmb);
}

bool RMB::operator<=(const RMB& rmb) const {
	return !operator>(rmb);
}

bool RMB::operator!=(const RMB& rmb) const {
	return !operator==(rmb);
}

RMB& RMB::operator++() {
	yuan++;
	jiao++;
	fen++;
	return *this;
}

const RMB RMB::operator++(int) {
	return RMB(yuan++, jiao++, fen++);
}

RMB& RMB::operator--() {
	yuan--;
	jiao--;
	fen--;
	return *this;
}

const RMB RMB::operator--(int) {
	return RMB(yuan--, jiao--, fen--);
}

int main() {
	RMB::printRMBInstanceCount();
	RMB a;
	RMB b(2, 2, 2);
	RMB* c = new RMB;
	RMB::printRMBInstanceCount();
	cout << b - a << endl;
	cout << b + a << endl;
	cout << b-- << endl;
	cout << --b << endl;
	delete c;
	RMB::printRMBInstanceCount();
}