在控制台应用程序中创建选项树

Question

应该很清楚我要完成的工作，根据之前的选择制作不同的选项树。出于某种原因，它在我离开 cmets 的两个地方都抛出了预期的错误“}。我做错了什么吗？这甚至会像我想要的那样工作吗？

namespace ConsoleApplication7
{
    class Program
    {
        static void Main(string[] args)
        {
            double TotalAmount;
            TotalAmount = 300.7 + 75.60;
            Console.WriteLine("Your account currently contains this much money: {0:C} ", TotalAmount);
            Console.WriteLine("Would you like to withdraw money? Please type yes or no.");
            string UserInput2 = Console.ReadLine();
            if (UserInput2.ToLower() == "yes") Console.WriteLine("How much would you like to withdraw?");
            {
                string UserInput = Console.ReadLine();
                double UserInput3 = double.Parse(UserInput);
                TotalAmount = TotalAmount - UserInput3;
                Console.WriteLine("Thank you. Your new balance is {0:C} ", TotalAmount);
                Console.WriteLine("Anything else?");
                string UserInput4 = Console.ReadLine();

                if (UserInput4.ToLower() == "yes") Console.WriteLine("What do you want to do?");
                Console.WriteLine("1). Withdraw");
                Console.WriteLine("2). Deposit");
                Console.WriteLine("Use number key for selection");
                string UserInput5 = Console.ReadLine();
                if (UserInput5.ToLower() == "1") Console.WriteLine("How much would you like to withdraw?");
                else if (UserInput5.ToLower() == "2") Console.WriteLine("How much would you like to deposit?");
                string UserInput6 = Console.ReadLine(); //FIRST ERROR

            else if (UserInput4.ToLower() == "no") Console.WriteLine("Have a nice day, and thanks for talking to me. Being an ATM is lonely :'(");
                {
                    System.Environment.Exit(1);
                }
            } //SECOND ERROR
            else if (UserInput2.ToLower() == "no") Console.WriteLine("Have a nice day, and thanks for talking to me. Being an ATM is lonely :'(");
            {
                System.Environment.Exit(1);
            }
        }
    }
}

Answer 1

您的问题是您的代码结构非常难以阅读，因此您在推理时遇到了问题。基本上，您没有正确关闭大括号。看看这个：

namespace ConsoleApplication7
{
    class Program
    {
        static void Main(string[] args)
        {
            double TotalAmount;
            TotalAmount = 300.7 + 75.60;
            Console.WriteLine("Your account currently contains this much money: {0:C} ", TotalAmount);
            Console.WriteLine("Would you like to withdraw money? Please type yes or no.");
            string UserInput2 = Console.ReadLine();
            string UserInput4;
            if (UserInput2.ToLower() == "yes")
            {
                Console.WriteLine("How much would you like to withdraw?");
                string UserInput = Console.ReadLine();
                double UserInput3 = double.Parse(UserInput);
                TotalAmount = TotalAmount - UserInput3;
                Console.WriteLine("Thank you. Your new balance is {0:C} ", TotalAmount);
                Console.WriteLine("Anything else?");
                UserInput4 = Console.ReadLine();
                if (UserInput4.ToLower() == "yes")
                {
                    Console.WriteLine("What do you want to do?");
                }
                Console.WriteLine("1). Withdraw");
                Console.WriteLine("2). Deposit");
                Console.WriteLine("Use number key for selection");
                string UserInput5 = Console.ReadLine();
                if (UserInput5.ToLower() == "1")
                {
                    Console.WriteLine("How much would you like to withdraw?");
                }
                else if (UserInput5.ToLower() == "2")
                {
                    Console.WriteLine("How much would you like to deposit?");
                }
                string UserInput6 = Console.ReadLine();
            }
            else if (UserInput2.ToLower() == "no")
            {
                Console.WriteLine("Have a nice day, and thanks for talking to me. Being an ATM is lonely :'(");
                System.Environment.Exit(1);
            }
            else if (UserInput2.ToLower() == "no") Console.WriteLine("Have a nice day, and thanks for talking to me. Being an ATM is lonely :'(");
            {
                System.Environment.Exit(1);
            }
        }
    }
}

我建议，每当您有“if”或“else if”语句时，始终将其后面的代码块放在大括号中——即使它是单行的。它将为您节省很多痛苦。 另外，很抱歉，如果我在回答中弄乱了您的应用程序逻辑。但是您将变量命名为 UserInput1、UserInput2 等。如果您提供一些更有意义的名称，例如“wouldLikeToWithdrawAnswer”、“howMuchAnswer”等，会容易得多。我只是对所有这些变量有点迷失了 :)

Answer 2

您编写代码的方式很难被别人理解。 你需要改进很多。这是工作的Example on .NET Fiddle

public static void Main()
    {
            double TotalAmount;
            TotalAmount = 300.7 + 75.60;
            Console.WriteLine("Your account currently contains this much money: {0:C} ", TotalAmount);
            Console.WriteLine("Would you like to withdraw money? Please type yes or no.");
            string UserInput2 = Console.ReadLine();
            if (UserInput2.ToLower() == "yes") 
            {
                Console.WriteLine("How much would you like to withdraw?");
                string UserInput = Console.ReadLine();
                double UserInput3 = double.Parse(UserInput);
                TotalAmount = TotalAmount - UserInput3;
                Console.WriteLine("Thank you. Your new balance is {0:C} ", TotalAmount);
                Console.WriteLine("Anything else?");
                string UserInput4 = Console.ReadLine();

                if (UserInput4.ToLower() == "yes")
                {
                    Console.WriteLine("What do you want to do?");
                    Console.WriteLine("1). Withdraw");
                    Console.WriteLine("2). Deposit");
                    Console.WriteLine("Use number key for selection");
                    string UserInput5 = Console.ReadLine();
                    if (UserInput5.ToLower() == "1")
                    {
                        Console.WriteLine("How much would you like to withdraw?");
                    }
                    else if (UserInput5.ToLower() == "2")
                    {
                        Console.WriteLine("How much would you like to deposit?");
                        string UserInput6 = Console.ReadLine(); //FIRST ERROR
                    }
                }
            else if (UserInput4.ToLower() == "no") 
                {
                    Console.WriteLine("Have a nice day, and thanks for talking to me. Being an ATM is lonely :'(");
                    System.Environment.Exit(1);
                }
            } //SECOND ERROR
            else if(UserInput2.ToLower() == "no") 
            {
                Console.WriteLine("Have a nice day, and thanks for talking to me. Being an ATM is lonely :'(");
                System.Environment.Exit(1);
            }
        }

Answer 3

问题是你的if 块没有去你认为的地方：

if (UserInput2.ToLower() == "yes") Console.WriteLine("How much would you like to withdraw?");
// And that's the if statement done.
        {
            // This is not part of any if block
            string UserInput = Console.ReadLine();
            double UserInput3 = double.Parse(UserInput);
            TotalAmount = TotalAmount - UserInput3;
            Console.WriteLine("Thank you. Your new balance is {0:C} ", TotalAmount);
            Console.WriteLine("Anything else?");
            string UserInput4 = Console.ReadLine();

            if (UserInput4.ToLower() == "yes") Console.WriteLine("What do you want to do?");
            Console.WriteLine("1). Withdraw");
            Console.WriteLine("2). Deposit");
            Console.WriteLine("Use number key for selection");
            string UserInput5 = Console.ReadLine();
            if (UserInput5.ToLower() == "1") Console.WriteLine("How much would you like to withdraw?");
            else if (UserInput5.ToLower() == "2") Console.WriteLine("How much would you like to deposit?");
            string UserInput6 = Console.ReadLine(); //FIRST ERROR

        else //Compiler says "else?  There is no if to match this with!"