using System;

class Represent 

{ public void repr(object obj) 

    {Console.WriteLine(obj.ToString());} 

} 

 class Rational 

{   int num; int denum; 

    public Rational(int n, int d) 

    {num = n;denum = d;} 

    public void Print() 

    { 

    Console.WriteLine(this.num+" / "+this.denum); 

    } 

    static int GCD(int a, int b) 

    {   int tmp,r; 

        if (a<b){tmp=a;a=b;b=tmp;} 

        while(b!=0) 

        {r=a%b; a=b; b=r;} 

        return a; 

    } 

    public override string ToString() 

    {return num.ToString() + " : "+ denum.ToString();} 

    //--------------------------

    public static Rational operator + (Rational r1,Rational r2) 

    { 

     Rational result = new Rational(0,1); 

     result.num = r1.num*r2.denum + r2.num*r1.denum; 

     result.denum=r1.denum *r2.denum; 

     int g = GCD(result.num,result.denum); 

     result.num=result.num/g;result.denum=result.denum/g; 

     return result; 

    }   

   //-------------------------

 public static Rational operator - (Rational r1,Rational r2) 

    { 

     Rational result = new Rational(0,1); 

     result.num = r1.num*r2.denum - r2.num*r1.denum; 

     result.denum=r1.denum *r2.denum; 

     int g = GCD(result.num,result.denum); 

     result.num=result.num/g;result.denum=result.denum/g; 

     return result; 

    } 

 //--------------------------------------------------

 public static Rational operator * (Rational r1,Rational r2) 

    { 

    Rational result = new Rational(0,1); 

     result.num = r1.num*r2.num; 

     result.denum=r1.denum *r2.denum; 

     int g = GCD(result.num,result.denum); 

     result.num=result.num/g;result.denum=result.denum/g; 

     return result; 

    } 

//--------------------------------------------------------

public static Rational operator / (Rational r1,Rational r2) 

    { 

     Rational result = new Rational(0,1); 

     result.num = r1.num*r2.denum; 

     result.denum=r1.denum *r2.num; 

     int g = GCD(result.num,result.denum); 

     result.num=result.num/g;result.denum=result.denum/g; 

     return result; 

    } 

 //----------------------------------------------------

   public static bool operator >(Rational r1,Rational r2) 

    { 

    if(r1.num*r2.denum > r1.denum*r2.num) return true; 

    else return false; 

    } 

 //-------------------------------------------------

  public static bool operator <(Rational r1,Rational r2) 

    { 

    if(r1.num*r2.denum < r1.denum*r2.num) return true; 

    else return false; 

    } 

} 

public class Program

{

    public static void Main()

    {

        Rational a=new Rational(6,3); 

​

        Rational b=new Rational(4,5); 

​

        Rational c = a+b;  

​

        Rational d = a-b; 

​

        Rational e = a*b; 

​

        Rational f = a/b; 

​

        bool g = a>b; 

​

        bool h = a<b; 

​

        Console.WriteLine(g+" "+h); 

​

        f.Print(); 

​

        e.Print(); 

​

        d.Print(); 

​

        c.Print(); 

    }

}