变量定义在主函数外面

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 变量定义在main函数外面
{
    class Program
    {
        public int a;//变量定义在外面

        struct student
        {
            public int sno;
            public string name;
            public string sex;
        }

        static void Main(string[] args)
        {
            Program pro = new Program();
            Console.Write("请输入班级人数：");
            pro.a= int.Parse(Console.ReadLine());
            double []fenshu=new double[pro.a];

            student stu=new student();//结构体初始化类，绿色的表示类


            Console.ReadLine();
        }
    }
}