数组

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

namespace ConsoleApplication1数组
{
    class Program
    {
        static void Main(string[] args)
        {
            //数组：具有相同类型的若干变量按有序的形式
           //组织起来的一种形式。这些按序排列的同类数据元素的集合称为数组。
           //int[] 变量名 = new int [n];
            //n表示开辟多少个空位
            //int [] array =new int[]{1,2,3,4,5};
            //array[2] = 6;//把2换成6
            //Console.WriteLine(array[0]);


            //string [] array1=new string[5];
            //for (int i = 0; i < array1.Length; i++)
            //{
            //    Console.Write("请输入第"+(i+1)+"个名字：");
            //    array1[i] = Console.ReadLine();
            //}


            //从控制台输入10个人的年龄放入数组，
            //将十个人的年龄求总和
            //int[] name = new int[10];
            //int sum = 0;
            //for (int i = 0; i < name.Length; i++)
            //{
            //    Console.Write("请输入第" + (i + 1) + "个年龄：");
            //    name[i] = int.Parse(Console.ReadLine());
            //    //sum += name[i];
            //}
            ////Console.WriteLine(sum);

            ////排序   冒泡排序
            //for (int i = 0; i < 10; i++)
            //{
            //    for (int j = i; j < 9; j++)
            //    {
            //        if (name[i] < name[j + 1])
            //        {//定义中间变量去调换两个值
            //            int zhong = name[i];
            //            name[i] = name[j + 1];
            //            name[j + 1] = zhong;
            //        }
            //    }
            //}
            //for (int i = 0; i < 10; i++)
            //{
            //    Console.WriteLine(name[i]);
            //}

            //生成十个不重复的数放入数组并打印出来
            int[] suiji = new int[10];
            Random ran = new Random();
            for (int i = 0; i < 10; i++)
            {
                bool b = true;
                int a = ran.Next(11);
                for (int j = 0; j <= i; j++)
                {
                    if (a == suiji[j])
                    {
                        b = false;
                        i--;
                    }
                }
                if (b)
                {
                    suiji[i] = a;
                }
            }
            //遍历数组
            foreach (int aa in suiji)
            {
                Console.WriteLine(aa);
            }

            //练习：
            //输入班级人数，根据人数，挨个输入成绩，求平均分，求最高分，最低分
            Console.Write("输入班级人数：");
            int renshu = int.Parse(Console.ReadLine());
            double[] fenshu = new double[renshu];//定义数组fenshu有renshu个空位
            double sum = 0;
            for (int i = 0; i < renshu; i++)
            {
                Console.Write("请输入第" + (i + 1) + "个人的分数:");
                fenshu[i] = double.Parse(Console.ReadLine());
                sum += fenshu[i];
            }
            for (int i = 0; i < renshu; i++)//冒泡排序，因为有（renshu）个人，外循环需要（renshu）次
            {                              //i的值为0.所以i<renshu
                //sum += fenshu[i];
                for (int j = i; j < renshu - 1; j++)
                {
                    if (fenshu[i] < fenshu[j + 1])
                    {
                        double zhong = fenshu[i];//这个排大小的方法叫冒泡法，就是从第一个数开始，
                        fenshu[i] = fenshu[j + 1];//用每一个数去跟后面的数字做比较，如果排序不对则交换位置                     
                        fenshu[j + 1] = zhong;
                    }
                }
            }
            double pj = sum / renshu;
            Console.WriteLine("平均成绩是" + pj + "分");
            Console.WriteLine("最高分是" + fenshu[0] + "分");
            Console.WriteLine("最低分是" + fenshu[renshu - 1] + "分");

           //二维数组定义方式
           //int [,] array =new int [a,b];
            //a表示有几个一维数组
            //b表示每个一维数组中有几个元素
            int[,] array = new int[3, 4]{
            {2,3,4,5},
            {3,4,5,6},
            {5,6,7,8}};
            //Console.WriteLine(array[1,1]);

            for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 4; j++)
                {
                    //Console.WriteLine(array[i,j]);//打印方式
                    array[i, j] = int.Parse(Console.ReadLine());//接收方式
                }
            }

            //打印一个王字
            string[,] wang = new string[,]
               {
                    {"  ","■","■","■","■","■","  "},
                    {"  ","  ","  ","■","  ","  ","  "},
                    {"  ","  ","  ","■","  ","  ","  "},
                    {"  ","  ","■","■","■","  ","  "},
                    {"  ","  ","  ","■","  ","  ","  "},
                    {"  ","  ","  ","■","  ","  ","  "},
                    {"■","■","■","■","■","■","■"}
               };
            for (int i = 0; i < 7; i++)
            {
                for (int j = 0; j < 7; j++)
                {
                    Console.Write(wang[i, j]);
                }
                Console.WriteLine();
            }

            //练习二
            //输入班级人数，根据人数创建数组
            //将每一个人的语文，数学，英语成绩放进去
            //计算出每个人的平均分
            Console.Write("请输入班级人数：");
            int renshu = int.Parse(Console.ReadLine());
            double[,] fenshu = new double[renshu, 3];
            for (int i = 0; i < renshu; i++)
            {
                double sum = 0;
                for (int j = 0; j < 3; j++)
                {
                    Console.Write("请输入成绩：");
                    fenshu[i, j] = double.Parse(Console.ReadLine());
                    sum += fenshu[i, j];
                }
                double pj = sum / 3;
                Console.WriteLine("平均成绩是" + pj + "分");
            }
            Console.ReadLine();
        }
    }
}