Question

我在C＃中编写了一个小循环，我希望在用户指定之前保持打开状态。

public void ScoreCalc()
    {
        string goon = " ";
        int counter = 1;
        int score = 0;

        while (goon == " ")
        {
            Console.WriteLine("Enter a score");
            score += int.Parse(Console.ReadLine());

            Console.WriteLine(score + " " + counter);
            counter++;
        }

    }

我知道这段代码不正确。

Answer 1

如果用户输入了除整数之外的任何内容，则可以将goon设置为" "以外的其他内容。

检查是否输入了整数的最简单方法是使用Int32.TryParse method。

public void ScoreCalc()
{
    string goon = " ";
    int counter = 1;
    int score = 0;
    int userInput = 0;
    bool isInt = true;

    while (goon == " ")
    {
        Console.WriteLine("Enter a score");

        isInt = Int32.TryParse(Console.ReadLine(), out userInput);

        if(isInt)
        {
            score += userInput;

            Console.WriteLine(score + " " + counter);
            counter++;
        }
        else
        {
            goon = "exit";
        }
    }
}

Answer 2

public void ScoreCalc()
{
    int counter = 1;
    int score = 0;
    String input;
    while (true)
    {
        Console.WriteLine("Enter a score");
        input=Console.ReadLine();
        if(input != "end"){
        score += int.Parse(input);
        Console.WriteLine(score + " " + counter);
        counter++;
        }else{
        break;
        }
    }

}

Answer 3

我已经更新了您的方法，假设＆＃34;退出＆＃34;文本作为来自用户的退出信号以打破while循环。希望这有帮助！

    public void ScoreCalc()
    {

        string goon = " ";
        int counter = 1;
        int score = 0;
        var userInput = string.Empty;
        var inputNumber = 0;
        const string exitValue = "quit";

        while (goon == " ")
        {
            Console.WriteLine("Enter a score or type quit to exit.");
            userInput = Console.ReadLine();
            if (userInput.ToLower() == exitValue)
            {
                break;
            }
            score += int.TryParse(userInput, out inputNumber) ? inputNumber : 0;

            Console.WriteLine(score + " " + counter);
            counter++;
        }

    }

C＃如何在用户需要时停止打开while循环

3 个答案: