C# 数组 [一]

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。
定义数组
int[] 变量名 = new int [n];

string[] myStringArray = new string[6];

int[] myArray = new int[] {1, 3, 5, 7, 9};
取值：int a = myArray[0];

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]+"\t");
}
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();

课后题

双色球：从33个红球中随机六个，按从小到大顺序排序，从16个蓝球中选取一个。

int[] suiji = new int[6];
Random ran = new Random();
for (int i = 0; i < 6; i++)
{
bool b = true;
int a = ran.Next(1, 34);
for (int j = 0; j < 1; j++)
{
if(a==suiji[j])
{
b=false;
i--;
}
}
if(b)
{
suiji[i]=a;
}
}
Console.Write("红球：");
for(int i = 0; i < 6; i++)
{
Console.Write(" "+suiji[i]);
}
Console.WriteLine();
for (int a = 0; a < 1; a++)
{
Random b = new Random();
int c = ran.Next(1,17);
Console.WriteLine("蓝色："+c);
}