using System;

public class Program

{

    public static void Main()

    {

        Zlomek zlomek1 = new Zlomek(10,5);

        Console.WriteLine("zlomek1 = " + zlomek1); // .ToString zde neni potreba, WriteLine si ho zavola sam, proto ho "pretezujeme" namisto psani si vlastni vypisovaci metody

        Zlomek zlomek2 = new Zlomek(9,5);

        Console.WriteLine("zlomek2 = " + zlomek2);

        Zlomek zlomek3 = zlomek1 * zlomek2;

        Console.WriteLine(zlomek1 + "*" + zlomek2 + " = " + zlomek3); 

        Zlomek zlomek4 = zlomek1 / zlomek2;

        Console.WriteLine(zlomek1 + "/" + zlomek2 + " = " + zlomek4);

        Zlomek zlomek5 = zlomek1 + zlomek2;

        Console.WriteLine(zlomek1 + "+" + zlomek2 + " = " + zlomek5);

        Zlomek zlomek6 = zlomek1 - zlomek2;

        Console.WriteLine(zlomek1 + "-" + zlomek2 + " = " + zlomek6);

        Zlomek zlomek7 = zlomek1.PrevedNaZakladni();

        Console.WriteLine(zlomek1 + " = " + zlomek7 + " = " + zlomek7.VypisSlozeny());

    }   

}

​

class Zlomek

{

    public int Citatel {get;set;}

    public int Jmenovatel {get;set;}

​

    public Zlomek(int citatel, int jmenovatel)

    {

        Citatel = citatel;

        Jmenovatel = jmenovatel;

    }

    public override string ToString()

    {

        return Citatel == 0 ? "0" : Citatel + "/" + Jmenovatel;

    }

    public static Zlomek operator*(Zlomek zlomek1, Zlomek zlomek2)

    {

        return new Zlomek(zlomek1.Citatel * zlomek2.Citatel, zlomek1.Jmenovatel * zlomek2.Jmenovatel);

    }

    public static Zlomek operator/(Zlomek zlomek1, Zlomek zlomek2)

    {

        return new Zlomek(zlomek1.Citatel * zlomek2.Jmenovatel, zlomek1.Jmenovatel * zlomek2.Citatel);

    }

    public static Zlomek operator+(Zlomek zlomek1, Zlomek zlomek2)

    {

        int lcm = CalcLCM(zlomek1.Jmenovatel, zlomek2.Jmenovatel);

        return new Zlomek(zlomek1.Citatel * lcm / zlomek1.Jmenovatel + zlomek2.Citatel * lcm / zlomek2.Jmenovatel, lcm);

    }   

    public static Zlomek operator-(Zlomek zlomek1, Zlomek zlomek2)

    {

        int lcm = CalcLCM(zlomek1.Jmenovatel, zlomek2.Jmenovatel);

        return new Zlomek(zlomek1.Citatel * lcm / zlomek1.Jmenovatel - zlomek2.Citatel * lcm / zlomek2.Jmenovatel, lcm);

    }       

    private static int CalcGCD(int a, int b)

    {

        return b == 0 ? a : CalcGCD(b, a%b);

    }

    private static int CalcLCM(int a, int b)

    {

        return a * b / CalcGCD(a,b);

    }

    public Zlomek PrevedNaZakladni()

    {

        return new Zlomek(Citatel / CalcGCD(Citatel, Jmenovatel), Jmenovatel / CalcGCD(Citatel, Jmenovatel));

    }

    public string VypisSlozeny()

    {

        int celeCislo = Citatel / Jmenovatel;

        int novyCitatel = (Citatel - (celeCislo) * Jmenovatel);

        string slozeny = "0";

        if(celeCislo != 0) 

        {

            slozeny = celeCislo.ToString();

            if(novyCitatel != 0)

            {

                return slozeny += " a " + novyCitatel + "/" + Jmenovatel;   

            }

            else

            {

                return slozeny;

            }

        }

        else if(novyCitatel != 0)

        {

            return  novyCitatel + "/" + Jmenovatel;

        }

        else return slozeny;        

    }   

}

​

​