c＃中的错误括号，为什么？

Question

为什么我在括号中出错？ 谢谢 https://onedrive.live.com/embed?cid=B71B2418AA133D20&resid=B71B2418AA133D20%211722&authkey=AGhuiPOEiWrvNLI

class Program
{
    static void Main(string[] args)
    {                                           //ERROR!!!
         public static class Calcolatrice
    {
        public static int Somma (int x, int y)
        {
            return x + y;
        }

        public static int Sottrazione (int x, int y)
        {
            return x - y;
        }



    }
    int i = Calcolatrice.Somma(12, 3);
    int j = Calcolatrice.Sottrazione(45, 34);
    }
}

Answer 1

您已在Main方法中定义了您的类。您需要在此之外定义您的类，可能在新文件中。

Answer 2

我已经为你更正了：

internal class Program
{
    private static void Main(string[] args)
    {           var i = Calcolatrice.Somma(12, 3);
        var j = Calcolatrice.Sottrazione(45, 34);
    }

    public static class Calcolatrice
    {
        public static int Somma(int x, int y)
        {
            return x + y;
        }

        public static int Sottrazione(int x, int y)
        {
            return x - y;
        }
    }
}