Revise paste 2d8a28a83b08c

#include <iostream>
using namespace std;

class A {
	int a, b;
public:
	A() {
		a = 0; b = 0;
	}

A(int a, int b) {
		this->a = a;
		this->b = b;
	}

//setA, setB, GetA, GetB;
	void setA(int a) {
		this->a = a;
	}
	int getA() {
		return this->a;
	}
	void setB(int b) {
		this->b = b;
	}
	int getB() {
		return this->b;
	}

bool operator > (A& obj) {
		if (this->a > obj.getA()) {
			return true;
		}
		return false;
	}

bool operator == (A& obj) {
		if (this->a == obj.getA()) {
			return true;
		}
		return false;
	}

bool operator < (A& obj) {
		if (this->a < obj.getA()) {
			return true;
		}
		return false;

}

A operator + (A& obj) {
		A res(0, 0);
		res.setA(this->a + obj.getA());
		return res;
	}

A operator - (A& obj) {
		A res(0, 0);
		res.setA(this->a - obj.getA());
		return res;
	}

A operator * (A& obj) {
		A res(0, 0);
		res.setA(this->a * obj.getA());
		return res;
	}

A operator / (A& obj) {
		A res(0, 0);
		res.setA(this->a / obj.getA());
		return res;
	}

void operator++() {
		this->a++;
	}

void operator--() {
		this->a--;
	}

void operator << (int n) {
		this->a << n;
	}
	void operator >> (int n) {
		this->a >> n;
	}

int operator [] (unsigned int i){
		if (i == 0) {
			return this->a;
		}
		else {
			return this->b;
		}
	}

double operator() (double p){
		return this->a * p;
	}
};

int main() {
	A obj1(50, 100);
	A obj2(100, 20);
	if (obj1 > obj2)
		cout << "obj1 > obj2" << endl;
	else
		cout << "obj1 <= obj2" << endl;

A res = obj1 + obj2;
	++obj1;
	double result = obj1(3.14);
	cout << "result: " << result << endl;
	obj1 << 3;
	cout << obj1.getA();
	cout << obj1[0] << ' ' << obj1[1] << endl;

}