Question

我似乎遇到一个问题，我需要循环条件的循环中的整数，这里是代码：

do {
    Console.WriteLine();
    Console.WriteLine("What file would you like to test?");
    Console.WriteLine("1. Royal Flush");
    Console.WriteLine("2. Straight Flush");
    Console.WriteLine("3. Four of a Kind");
    Console.WriteLine("4. Full House");
    Console.WriteLine("5. Flush");
    Console.WriteLine("6. Straight");
    Console.WriteLine("7. Three of a Kind");
    Console.WriteLine("8. Two Pair");
    Console.WriteLine("9. Pair");
    Console.WriteLine("10. Exit");
    choiceInt = Convert.ToInt32(Console.ReadLine());
} while (choiceInt < 10 || choiceInt > 0);

我需要使用choiceInt作为循环的条件，为了让它在我获得一个值之前让它循环一次，

Answer 1

您的>和<错误：当选择错误时，您需要一个评估为true的条件（因此循环应继续询问用户输入）。由于do / while在条件变为false时退出，因此您可以确保在退出循环后choiceInt处于有效范围内。

条件应如下所示：

do {
    ...
} (choiceInt < 0 || choiceInt > 10);
//    ^^^^              ^^^^
//  negative          above ten

Answer 2

这对你有用：

    static void Main(string[] args)
    {
        string consoleInput;
        ShowOptions();         

        do
        {
            consoleInput = Console.ReadLine();
            if (consoleInput == "10")
                Environment.Exit(0);

            DoSomething();
            ShowOptions();

        } while (consoleInput != null && consoleInput != "10");
    }

    private static void ShowOptions()
    {
        Console.WriteLine();
        Console.WriteLine("What file would you like to test?");
        Console.WriteLine("1. Royal Flush");
        Console.WriteLine("2. Straight Flush");
        Console.WriteLine("3. Four of a Kind");
        Console.WriteLine("4. Full House");
        Console.WriteLine("5. Flush");
        Console.WriteLine("6. Straight");
        Console.WriteLine("7. Three of a Kind");
        Console.WriteLine("8. Two Pair");
        Console.WriteLine("9. Pair");
        Console.WriteLine("10. Exit");
    }

    private static void DoSomething() { Console.WriteLine("I am doing something!"); }

Answer 3

我倾向于尝试整理代码以使其更通用。试着这样做：

var options = new []
{
    new { option = 1, text = "Royal Flush" },
    new { option = 2, text = "Straight Flush" },
    new { option = 3, text = "Four of a Kind" },
    new { option = 4, text = "Full House" },
    new { option = 5, text = "Flush" },
    new { option = 6, text = "Straight" },
    new { option = 7, text = "Three of a Kind" },
    new { option = 8, text = "Two Pair" },
    new { option = 9, text = "Pair" },
    new { option = 10, text = "Exit" },
};

string choice;
do
{
    Console.WriteLine();
    Console.WriteLine("What file would you like to test?");
    Console.WriteLine(
        String.Join(
            Environment.NewLine,
            options.Select(o => String.Format("{0}. {1}", o.option, o.text))));
    choice = Console.ReadLine();
} while (options.Take(9).Any(o => o.option.ToString() == choice));

Answer 4

你不必改变太多。只需将其设为do while循环而不是do循环。此外，你的while循环的条件似乎有点偏。如果值不在1-10范围内，你不想继续循环吗？

int choiceInt = Convert.ToInt32(Console.ReadLine());

while (choiceInt > 10 || choiceInt < 0) {
    Console.WriteLine("What file would you like to test?");
    Console.WriteLine("1. Royal Flush");
    Console.WriteLine("2. Straight Flush");
    Console.WriteLine("3. Four of a Kind");
    Console.WriteLine("4. Full House");
    Console.WriteLine("5. Flush");
    Console.WriteLine("6. Straight");
    Console.WriteLine("7. Three of a Kind");
    Console.WriteLine("8. Two Pair");
    Console.WriteLine("9. Pair");
    Console.WriteLine("10. Exit");
    choiceInt = Convert.ToInt32(Console.ReadLine());
}

C＃中的循环故障

4 个答案: