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

namespace ConsoleApp1
{
    class Student
    {
        public string name; //字段  名字
        public int age;     //字段  年龄
        public int _class;  //字段  班级
        public long number; //字段  学号

        public Student()    //构造方法一
        {
            this.name = "涨三";   //赋默认值
            this.age = 11;
            this._class = 2017;
            this.number = 0000;

        }
        public Student(string F2Name, int F2Age, int F2_class, long F2Number)   //构造方法二
        {
            this.name = F2Name;     //实参赋值给相应字段
            this.age = F2Age;
            this._class = F2_class;
            this.number = F2Number;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            long sum = 0;
            const int SIZE = 5;
            Student[] a = new Student[SIZE];    //类数组
            for (int i = 0; i < SIZE; i++)
            {
                a[i] = new Student();       //数组声明
                Console.WriteLine("第{0}次输入数据：\n名字", i + 1);
                a[i].name=Console.ReadLine();       //数组实例化
                Console.WriteLine("年龄");
                a[i].age= int.Parse(Console.ReadLine());
                Console.WriteLine("班级");
                a[i]._class= int.Parse(Console.ReadLine());
                Console.WriteLine("学号");
                a[i].number= long.Parse(Console.ReadLine());

                Student c = new Student(a[i].name, a[i].age, a[i]._class, a[i].number);
            }
            for (int i=0;i<SIZE;i++)
            {
                sum += a[i].age;    //调用10个不同对象的age
            }
            Console.WriteLine(sum/SIZE);
            Console.Read();
        }
    }
}