using System;

​

class Kalkulacka

    {

        public double FirstNumber;

        public double SecondNumber;

        public string Operator;

​

        public Kalkulacka(double firstNumber, double secondNumber, string operatorLikeText)

        {

            FirstNumber = firstNumber;

            SecondNumber = secondNumber;

            Operator = operatorLikeText;

        }

        public double ProvedVypocet(double firstNumber, string operatorLikeText, double secondNumber)

        {

            double result = 0;

            switch (operatorLikeText)

            {

                case "+": result = FirstNumber + SecondNumber;

                    break;

                case "-": result = FirstNumber - SecondNumber;

                    break;

                case "*": result = FirstNumber * SecondNumber;

                    break;

                case "/": result = FirstNumber / SecondNumber;

                    break;

                case "^": result = FirstNumber;

                    for (double i = SecondNumber - 1; i > 0; i--)

                    {

                        result = result * FirstNumber;

                    };

                    break;

            }

            return result;

        }

    }

public class Program

    {

   public static void Main(string[] args)

        {

            Console.WriteLine("Zadej první číslo.");

           double firstNumber;

            bool firstNumberCheck = double.TryParse(Console.ReadLine(), out firstNumber);

            while (firstNumberCheck == false)

            {

                Console.WriteLine("Nezadal jsi cislo.");

                firstNumberCheck = double.TryParse(Console.ReadLine(), out firstNumber);

            }

            while (true)

             {

                Console.WriteLine("Zadej operátor.");

                string operatorLikeText = Console.ReadLine();

                //Kontrolu operátoru je lepší dát přímo do třídy kalkulačka, tak aby nám samotná kalkulačka mohla říct, jestli je operace schopna nebo ne

                //Zkus tedy vytvořit metodu v kalkulačce, která bude vracet true nebo false podle toho, jestli je operátor správný nebo ne

                //podmínka cykly by pak mohla vypadat zhruba takto: while(kalkulacka.SpravnyOperator == false)

                while (operatorLikeText != "+" && operatorLikeText != "-" && operatorLikeText != "*" && operatorLikeText != "/" && operatorLikeText != "^" && operatorLikeText != "X")

                {

                    Console.WriteLine("Nezadal jsi operator.");

                    operatorLikeText = Console.ReadLine();

                }

                if (operatorLikeText == "X")

                {

                    Console.WriteLine("KONEC");

                    Console.ReadLine();

                    return;

                }

                Console.WriteLine("Zadej druhé číslo.");

                double secondNumber;

                bool secondNumberCheck = double.TryParse(Console.ReadLine(), out secondNumber);

                while (secondNumberCheck == false)

                {

                    Console.WriteLine("Nezadal jsi cislo.");

                    secondNumberCheck = double.TryParse(Console.ReadLine(), out secondNumber);

                }

                Kalkulacka kalkulacka = new Kalkulacka(firstNumber, secondNumber, operatorLikeText);

                kalkulacka.ProvedVypocet(firstNumber, operatorLikeText, secondNumber);

                double result = kalkulacka.ProvedVypocet(firstNumber, operatorLikeText, secondNumber);

                Console.WriteLine("Výsledek: " + firstNumber + operatorLikeText + secondNumber + "=" + result );

                firstNumber = result;

            }

        }

    }