using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Zadej prvni cislo:");

        double prvniCislo = double.Parse(Console.ReadLine());

        Console.WriteLine("Zadej operator:");

        string mujOperator = Console.ReadLine();

        Console.WriteLine("Zadej dalsi cislo:");

        double druheCislo = double.Parse(Console.ReadLine());

        switch (mujOperator) 

        {

        case

        }

        bool povedloSe = double.TryParse()

    }

}