클래스 Power(프렌드 함수, 연산자 중복)

1.

#include<iostream>
using namespace std;

class Power {
	int kick;
	int punch;
public:
	Power(int kick = 0, int punch = 0) {
		this->kick = kick; this->punch = punch;
	}
	void show();
	Power operator+ (Power op2);
	Power operator-(Power op3);
};

void Power::show() {
	cout << "kick=" << kick << ',' << "punch=" << punch << endl;
}

Power Power::operator+(Power op2){
	Power tmp;
	tmp.kick = this->kick + op2.kick;
	tmp.punch = this->punch + op2.punch;
	return tmp;
}

Power Power::operator-(Power op3) {
	Power tmp;
	tmp.kick = this->kick - op3.kick;
	tmp.punch = this->punch - op3.punch;
	return tmp;
}

int main() {
	Power a(3, 5), b(4, 6), c;
	cout << "< 덧셈 >" << endl;
	c = a + b;
	a.show();
	b.show();
	c.show();
	cout << "< 뺄셈 >" << endl;
	c = a - b;
	a.show();
	b.show();
	c.show();
}

 

2.

#include<iostream>
using namespace std;

class Power {
private:
	int kick;
	int punch;
public:
	Power(int kick = 0, int punch = 0) {
		this->kick = kick; this->punch = punch;
	}
	void show();
	Power& operator++();
	friend Power operator++(Power &op, int x);
	Power& operator+ (int op);
	friend Power operator +(int op1, Power op2);
};

void Power::show() {
	cout << "kick=" << kick << "," << "punch=" << punch << endl;
}

Power& Power::operator++() {
	kick++;
	punch++;
	return *this;
}

Power operator++(Power &op, int x) {
	Power temp = op;
	op.kick++;
	op.punch++;
	return temp;
}

Power& Power::operator+(int op) {
	Power temp;
	temp.kick = kick + op;
	temp.punch = punch + op;
	return temp;
}

Power operator+(int op1, Power op2) {
	Power temp;
	temp.kick = op1 + op2.kick;
	temp.punch = op1 + op2.punch;
	return temp;
}

int main()
{
	Power a(2, 4), b;
	b = ++a;
	a.show();
	b.show();

	b = a++;
	a.show();
	b.show();

	b = a + 4;
	a.show();
	b.show();

	a = 2 + b;
	a.show();
	b.show();
}