2.27

一维数组
int [] array = new int [5]{1,2,3,4,5};
 int [] array = new int[5];
 array[0] = 1;
 array[1] = 2;
 array[2] = 3;
 array[3] = 4;
 array[4] = 5;
 array[5] = 6; 超出索引范围

 int a = array[2];string [] ss = new string[3];

ss[0] = "1";
ss[1] = "2";
ss[2] = "3";

string b = ss[2];

输入三个人名放入数组
string[] name = new string[3];
Console.Write("请输入第一个人名：");
name[0] = Console.ReadLine();
Console.Write("请输入第二个人名：");
name[1] = Console.ReadLine();
Console.Write("请输入第三个人名：");
name[2] = Console.ReadLine();
for (int i = 1; i <= 3; i++)
{
Console.Write("请输入第{0}个人名：",i);
name[i - 1] = Console.ReadLine();
}

//根据班级人数创建一个数组，要求每个人的姓名都要放进去
Console.Write("请输入班级人数：");
int n = int.Parse(Console.ReadLine());
string[] name = new string[n];
for (int i = 0; i < n; i++)
{
Console.Write("请输入第{0}个人的姓名：", i + 1);
name[i] = Console.ReadLine();
}
Console.WriteLine("所有人员姓名输入完毕，请按回车键查看所有人员姓名！");
Console.ReadLine();
Console.WriteLine();
for (int i = 0; i < n; i++)
{
Console.Write(name[i] + " ");
}
Console.ReadLine();

从控制台输入班级人数
将每个人的年龄放入数组，
将所有人的年龄求总和
求平均年龄
求年龄最大
Console.Write("请输入班级人数：");
int n = int.Parse(Console.ReadLine());
int [] age = new int[n];
int sum = 0;
for (int i = 0; i < n; i++)
{
Console.Write("请输入第{0}个人的年龄：",i+1);
age[i] = int.Parse(Console.ReadLine());
sum+=age[i];
}
Console.WriteLine(sum);
Console.WriteLine(sum/n);
int agemax = 0;
for (int i = 0; i < n; i++)
{
if (agemax < age[i])
{
agemax = age[i];
}
}
Console.WriteLine("最大年龄是："+agemax);

//冒泡排序
for (int i = 0; i < n; i++)
{
for (int j = i; j < n-1; j++)
{
if (age[i] < age[j+1])
{
int zhong = age[i];
age[i] = age[j+1];
age[j+1] = zhong;
}
}
}

for (int i = 0; i < n; i++)
{
Console.WriteLine(age[i]);
}
Console.ReadLine();

//输入班级人数
//输入每个人的分数
//求总分、平均分、两个最高分，两个最低分
Console.Write("请输入班级的人数");
int n = int.Parse(Console.ReadLine());
double[] b = new double[n];
double fen = 0;
for (int i = 0; i < n; i++)
{
Console.Write("请输入{0}的分数：", i + 1);
b[i] = double.Parse(Console.ReadLine());
fen += b[i];
}
Console.Write(fen);
Console.Write(fen/n);

Console.ReadLine();