Phân Số 1

#include <iostream>
using namespace std;
class PhanSo
{
public:
	PhanSo(int TuSo = 0, int MauSo = 1)
	{
		this->MauSo = MauSo;
		this->TuSo = TuSo;
	}
	PhanSo(double a)
	{
		this->MauSo = 1;

		while (a != int(a))
		{
			a = a * 10;
			this->MauSo *= 10;
		}
		this->TuSo = a;
		RutGon();
	}
	void RutGon();
	friend istream& operator >> (istream& in, PhanSo &p);
	friend ostream& operator << (ostream& out, PhanSo p);
	friend bool operator > (PhanSo a, PhanSo b);
	friend bool operator < (PhanSo a, PhanSo b);
	friend bool operator == (PhanSo a, PhanSo b);
	friend bool operator <= (PhanSo a, PhanSo b);
	friend bool operator >= (PhanSo a, PhanSo b);
	friend PhanSo operator +(PhanSo a, PhanSo b);
	friend PhanSo operator -(PhanSo a, PhanSo b);
	friend PhanSo operator *(PhanSo a, PhanSo b);
	friend PhanSo operator /(PhanSo a, PhanSo b);
	friend void operator += (PhanSo &a, PhanSo b);
	friend void operator -= (PhanSo &a, PhanSo b);
	friend void operator *= (PhanSo &a, PhanSo b);
	friend void operator /= (PhanSo &a, PhanSo b);
private:
	int TuSo, MauSo;
};
//Rút Gọn 1 phân số
void PhanSo::RutGon()
{
	int iDau = 1;
	if (this->TuSo * this->MauSo < 0) iDau = -1;
	this->TuSo = abs(this->TuSo);
	this->MauSo = abs(this->MauSo);
	for (int i = this->TuSo; i > 1; i--)
	{
		if (this->TuSo % i == 0 && this->MauSo % i == 0)
		{
			this->TuSo /= i;
			this->MauSo /= i;
			break;
		}
	}
	this->TuSo *= iDau;
}
//Toán tử nhập
istream& operator >> (istream& in, PhanSo &PS)
{
	cout << "Nhap tu so : ";
	in >> PS.TuSo;
	cout << "Nhap mau so: ";
	in >> PS.MauSo;
	if (PS.MauSo == 0)
	{
		cout << "ERROR\n";
		cin >> PS;
	}
	return in;
}
//Toán tử xuất
ostream& operator << (ostream& out, PhanSo PS)
{
	if (PS.TuSo != 0)
	{
		out << PS.TuSo;
		if (PS.MauSo != 1)
		{
			cout << " / ";
			out << PS.MauSo;
		}
	}
	else
		out << "0";
	return out;
}
//So sánh >, <, ==, >=, <=
bool operator > (PhanSo a, PhanSo b)
{
	return (float(a.TuSo) / a.MauSo > float(b.TuSo) / b.MauSo);
}
bool operator < (PhanSo a, PhanSo b)
{
	return (float(a.TuSo) / a.MauSo < float(b.TuSo) / b.MauSo);
}
bool operator == (PhanSo a, PhanSo b)
{
	return (float(a.TuSo) / a.MauSo == float(b.TuSo) / b.MauSo);
}
bool operator >= (PhanSo a, PhanSo b)
{
	return (float(a.TuSo) / a.MauSo >= float(b.TuSo) / b.MauSo);
}
bool operator <= (PhanSo a, PhanSo b)
{
	return (float(a.TuSo) / a.MauSo <= float(b.TuSo) / b.MauSo);
}
//Toán tử +, -, *, /
PhanSo operator + (PhanSo a, PhanSo b)
{
	PhanSo Kq;
	Kq.MauSo = a.MauSo * b.MauSo;
	Kq.TuSo = a.TuSo * b.MauSo + a.MauSo * b.TuSo;
	Kq.RutGon();
	return Kq;
}
PhanSo operator - (PhanSo a, PhanSo b)
{
	PhanSo Kq;
	Kq.MauSo = a.MauSo * b.MauSo;
	Kq.TuSo = a.TuSo * b.MauSo - a.MauSo * b.TuSo;
	Kq.RutGon();
	return Kq;
}
PhanSo operator * (PhanSo a, PhanSo b)
{
	PhanSo Kq;
	Kq.MauSo = a.MauSo * b.MauSo;
	Kq.TuSo = a.TuSo * b.TuSo;
	Kq.RutGon();
	return Kq;
}
PhanSo operator / (PhanSo a, PhanSo b)
{
	PhanSo Kq;
	Kq.MauSo = a.MauSo * b.TuSo;
	Kq.TuSo = a.TuSo * b.MauSo;
	Kq.RutGon();
	return Kq;
}
//Toán tử +=, -=; *=, /=
void operator += (PhanSo &a, PhanSo b)
{
	a = a + b;
}
void operator -= (PhanSo &a, PhanSo b)
{
	a = a - b;
}
void operator *= (PhanSo &a, PhanSo b)
{
	a = a * b;
}
void operator /= (PhanSo &a, PhanSo b)
{
	a = a / b;
}

void main()
{
	PhanSo P(1, 1), a;
	a = P;
	float b = 1.1;
	cout << 1 + a + 1.1;
}