#include <iostream>;
using namespace std;
class fraction
{
	private:
		int num, deno;
	public:
		fraction()
		{
            num = 1;
            deno = 1;
		}
		fraction (int l, int y)
		{
		    num = l;
		    deno = y;
		}
		void operator=(const fraction& f)
		{
		num=f.num;
		deno=f.deno;
		}
		void shorten();
		friend istream& operator>>(istream& is,fraction& ft); //nhap
 		friend ostream& operator<<(ostream& os,const fraction& ft); //xuat
 		 //cac toan tu so sanh
 		friend operator == (const fraction& ,const fraction& );
 		friend operator != (const fraction& ft1,const fraction& ft2);
 		friend operator > (const fraction& ft1,const fraction& ft2);
 		friend operator < (const fraction& ft1,const fraction& ft2);
};
 istream& operator>>(istream& is,fraction& f)
 {
 	cout<<"     Enter numerator: ";
 	is>>f.num;
  	cout<<"     Enter denominator: ";
  	do
	{
	    if(f.deno==0)
   		cout<<"Fraction error, try again: ";
   		is>>f.deno;
  	}
	while(f.deno==0);
  	if(f.deno<0) //doi dau
  		{
   			f.num=-f.num;
   			f.deno=-f.deno;
  		}
  	f.shorten();
  	return is;
 }
 ostream& operator<<(ostream& os,const fraction& f)
{
  	{
  		if(f.num==0)
   		os<<"\nFraction =0"<<endl;
  		if(f.num==f.deno)
   		os<<"\nFraction =1"<<endl;
  		else
  		os<<"\nFraction ="<<f.num<<"/"<<f.deno<<endl;
  	}
  	return os;
}
 // ham rut gon
int divisor(int a,int b)
{
 	int x;
 	while(b!=0)
 	{
  		x=a%b;
  		a=b;
  		b=x;
 	}
 	return a;
}
void fraction::shorten()
{
 	if(deno<0)
 	{
  		num=-num;
  		deno=-deno;
 	}
 	int u=divisor(num,deno);
 	num=num/u;
 	deno=deno/u;
}




 int main()
 {
 	fraction a,b;
 	cout<<"Enter fraction A:\n";
 	cin>>a;
 	cout<<"Enter fraction B:\n";
 	cin>>b;
 	cout<<a;
 	cout<<b;
 }