2 курс / 6 / 6 / Source

#include <iostream>

using namespace std;

class Pair abstract
{
public:

	double first;
	double second;
	Pair() {}
	Pair(double first, double second) : first(first), second(second) {}
	virtual Pair* plus(Pair *obj) abstract;
	virtual Pair* sub(Pair *obj) abstract;
	virtual Pair* mult(Pair *obj) abstract;
	virtual Pair* div(Pair *obj) abstract;
};

class Rational : public Pair
{
public:

	Rational(double a, double b) : Pair(a, b) { }
	Pair* plus(Pair* obj) override
	{
		if (this->second == obj->second)
		{
			return  new Rational(this->first + obj->first, this->second);
		}
		else
		{
			return new Rational(this->first * obj->second + obj->first*this->second, this->second*obj->second);
		}
	}
	Pair* sub(Pair* obj) override
	{
		if (this->second == obj->second)
		{
			return  new Rational(this->first - obj->first, this->second);
		}
		else
		{
			return new Rational(this->first * obj->second - obj->first*this->second, this->second*obj->second);
		}
	}
	Pair* mult(Pair* obj) override
	{
		return new Rational(this->first * obj->first, this->second*obj->second);
	}

	Pair* div(Pair* obj) override
	{
		return new Rational(this->first*obj->second, this->second*obj->first);
	}

	void Print()const
	{
		cout << first << " / " << second << endl;
	}
};

class Complex : public Pair
{
public:

	Complex(double a, double b) : Pair(a, b) { }

	Pair* plus(Pair* obj) override
	{
		return new Complex(this->first + obj->first, this->second + obj->second);
	}
	Pair* sub(Pair* obj) override
	{
		return new Complex(this->first - obj->first, this->second - obj->second);
	}
	Pair* mult(Pair* obj) override
	{
		return new Complex(this->first * obj->first - this->second * obj->second, this->first*obj->second + this->second*obj->first);
	}

	Pair* div(Pair* obj) override
	{
		return new Complex((this->first * this->second + obj->first * obj->second)/(obj->first*obj->first + obj->second*obj->second), (this->second*obj->first - this->first*obj->second)/(obj->first*obj->first + obj->second*obj->second));
	}

	void Print()const
	{
		cout << this->first << " + " << this->second << "i" << endl;
	}
};

int main()
{
	cout << "RATIONAL " << endl;
	Rational a(1.0, 2.0);
	Rational b(4.0, 2.0);
	cout << "a : ";
	a.Print();
	cout << "b : ";
	b.Print();
	cout << endl;

	cout << "a + b : ";	
	dynamic_cast<Rational*>(a.plus(&b))->Print();
	cout << endl;

	cout << "a - b : ";
	dynamic_cast<Rational*>(a.sub(&b))->Print();
	cout << endl;

	cout << "a * b : ";
	dynamic_cast<Rational*>(a.mult(&b))->Print();
	cout << endl;

	cout << "a / b : ";
	dynamic_cast<Rational*>(a.div(&b))->Print();
	cout << endl;
	cout << endl;
	cout << endl;
	cout << "COMPLEX " << endl;

	Complex ac(5,-6);
	Complex bc(-3.0, 2.0);
	cout << "a : ";
	ac.Print();
	cout << "b : ";
	bc.Print();
	cout << endl;

	cout << "a + b : ";
	dynamic_cast<Complex*>(ac.plus(&bc))->Print();
	cout << endl;

	cout << "a - b : ";
	dynamic_cast<Complex*>(ac.sub(&bc))->Print();
	cout << endl;

	cout << "a * b : ";
	dynamic_cast<Complex*>(ac.mult(&bc))->Print();
	cout << endl;

	cout << "a / b : ";
	dynamic_cast<Complex*>(ac.div(&bc))->Print();
	cout << endl;

	system("pause");
	return 0;
}