#include "stdafx.h"
#include "iostream"
#include <conio.h>
#include <math.h>
using namespace std;
class PS
{
private:
	int tu,mau;
public:
	friend ostream& operator<<( ostream& os,const PS &p)
	{
		os<<p.tu<<"/"<<p.mau;
		return os;
	}
	friend istream& operator>>(istream& is,  PS &p)
	{
		cout<<"\nNhap  Tu so:";is>>p.tu;
		do
		{
			cout<<"\nNhap Mau so :";
			is>>p.mau;
		}
		while(p.mau==0);
		return is;
	}
	int uscln(int x,int y);
	void rutgon();
	PS operator+(PS);
	PS operator-(PS);
	PS operator*(PS);
	PS operator/(PS);
};
int PS::uscln(int x,int y)
{
	x=abs(x);y=abs(y);
		if(x*y==0) return 1;
	while(x!=y)
		if(x>y) x-=y;
		else y-=x;
		return x;
}
void PS::rutgon()
{
	int x;
	x=uscln(tu,mau);
	tu=tu/x;
	mau=mau/x;
}
PS PS::operator+(PS q)
{
	PS t;
	t.tu=tu*q.mau+mau*q.tu;
	t.mau=mau*q.mau;
	t.rutgon();
	return t;
}
PS PS::operator-(PS q)
{
	PS t;
	t.tu=tu*q.mau-mau*q.tu;
	t.mau=mau*q.mau;
	t.rutgon();
	return t;
}
PS PS::operator*(PS q)
{
	PS t;
	t.tu=tu*q.tu;
	t.mau=mau*q.mau;
	t.rutgon();
	return t;
}
PS PS::operator/(PS q)
{
	PS t;
	t.tu=tu*q.mau;
	t.mau=mau*q.tu;
	t.rutgon();
	return t;
}
void main()
{
	PS p,q,cong,tru,nhan,chia;
	cout<<"\n Nhap PS p: ";cin>>p;
	cout<<"\n PS p la : "<<p;
	cout<<"\n Nhap PS q: ";cin>>q;
	cout<<"\n PS q la : "<<q;
	cong=p+q;
	cout<<"\n Phep p + q :"<<p<<"+"<<q<<"="<<cong;
	tru=p-q;
	cout<<"\n Phep p - q :"<<p<<"-"<<q<<"="<<tru;
	nhan=p*q;
	cout<<"\n Phep p * q :"<<p<<"*"<<q<<"="<<nhan;
	chia=p/q;
	cout<<"\n Phep p : q :"<<p<<"/"<<q<<"="<<chia;
	getch();
}