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Накратко, правя лап упражненията от C# Fundamentials и съм на задача 7 Vending Machine.

Solution #13884301 by VesselinTonchev for problem 07. Vending Machine

Давам ми 100/100, в същото време ми изкарва един куп грешки и пак в същото време, тези грешки са грешни. Пример:

Test input:

1
Start
Nuts
Coke
End

Expected output:

Sorry, not enough money
Purchased coke
Change: 0.00   ----------------който изобщо не трябва да е верен

Your output:

Purchased nuts
Sorry, not enough money
Change: 1.00
Change: 1.00          -------------------- трябва да си е верен.

using System;

namespace Vending_machine__2
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            //double coinInserted = double.Parse(Console.ReadLine());

            //VARIABLES
            double inputToNum = double.Parse(input);
            double sum = 0;
            double price = 0;
            bool end = false;
            double tempPrice = 0;
            double totalPrice = 0;
            //VARIABLES

            //COIN CHECKER
            while (input != "Start")
            {
                inputToNum = double.Parse(input);
                if (inputToNum != 0.1 && inputToNum != 0.2 &&
                    inputToNum != 0.5 && inputToNum != 1 && inputToNum != 2)
                {
                    Console.WriteLine($"Cannot accept {input}");
                    input = Console.ReadLine();
                    //inputToNum = double.Parse(input);
                    continue;
                }
                sum += inputToNum;
                input = Console.ReadLine();
                //COIN CHECKER
            }

            //PURCHASING PRODUCTS
            if (input == "Start")
            {
                while (input != "End")
                {
                    //PRODUCT BASE
                    switch (input)
                    {
                        case "Nuts":
                            price = 2.0;
                            Console.WriteLine("Purchased nuts");
                            break;
                        case "Water":
                            price = 0.7;
                            Console.WriteLine("Purchased water");
                            break;
                        case "Crisps":
                            price = 1.5;
                            Console.WriteLine("Purchased crisps");
                            break;
                        case "Soda":
                            price = 0.8;
                            Console.WriteLine("Purchased soda");
                            break;
                        case "Coke":
                            price = 1.0;
                            Console.WriteLine("Purchased coke");
                            break;
                        case "Start":
                            break;
                        default:
                            Console.WriteLine("Invalid product");
                            break;
                    }
                    //PRODUCT BASE

                    tempPrice = price;
                    totalPrice += price;

                    if (totalPrice > sum)
                    {
                        totalPrice -= price;
                        Console.WriteLine("Sorry, not enough money");

                        Console.WriteLine($"Change: {sum - totalPrice:f2}");
                        end = true;

                        if (end)
                        {
                            break;
                        }
                    }
                    input = Console.ReadLine();
                }
            }
            //PURCHASING PRODUCTS

            Console.WriteLine($"Change: {sum - totalPrice:f2}");
        }
    }
}