在C＃中分隔用户输入数字

Question

如何在C＃的控制台应用程序中分隔一组数字，而不是询问用户每个单独的数字？ 例如，而不是这样做...

        double first, second, third, fourth;

        Console.Write("Please enter first digit: ");
        first = Convert.ToDouble(Console.ReadLine());
        Console.Write("Please enter second digit: ");
        second = Convert.ToDouble(Console.ReadLine());
        Console.Write("Please enter third digit: ");
        third = Convert.ToDouble(Console.ReadLine());
        Console.Write("Please enter fourth digit: ");
        fourth = Convert.ToDouble(Console.ReadLine());

Answer 1

您可以让他们用某种分隔符（在本例中为空格）一次输入所有数字。

Console.Write("Please enter a bunch of digits separated by a space: ");
var allDigits = Console.ReadLine().Split(' ');
Double[] digits = allDigits.Select(d => Covert.ToDouble(d)).ToArray();

如果您的要求限制为4 inputs ，则使用IEnumerable<string>.Take(4)来限制allDigit

Console.Write("Please enter a bunch of digits separated by a space: ");
var allDigits = Console.ReadLine().Split(' ').Take(4);
Double[] digits = allDigits.Select(d => Covert.ToDouble(d)).ToArray();

Answer 2

利用array ，它可以帮助您更快地对变量进行读/写操作

    double[] numbers = new double[4];

    for (int i = 0; i < 4; i++)
    {
        Console.WriteLine("Enter {0} of 4 Number : ", i + 1);
        numbers[i] = Convert.ToDouble(Console.ReadLine());
    }

    // numbers[0] = first
    // numbers[1] = second
    // numbers[2] = third
    // numbers[3] = fourth

如果您确实要使用四个变量，那么这可能是最短的方法：

    double first, second, third, fourth;

    for (int i = 1; i <= 4; i++)
    {
        Console.WriteLine("Enter a number : ");
        double input = Convert.ToDouble(Console.ReadLine());
        switch (i)
        {

            case 1:
                first = input;
                break;

            case 2:
                second = input;
                break;

            case 3:
                third = input;
                break;
            case 4:
                fourth = input;
                break;

        }
    }

Answer 3

这是一种方法：

Console.Write("Please enter numbers, comma-separated: ");
var numbers = Console.ReadLine()
    .Split(',')
    .Select(x => Double.Parse(x.Trim()))
    .ToList();

但是，在现实生活中的代码中，最好使用TryParse并将错误返回给用户。