C# 數組 [一]

數組：具有相同類型的若幹變數按有序的形式組織起來的一種形式。這些按序排列的同類數據元素的集合稱為數組。
定義數組
int[] 變數名 = new int [n];

string[] myStringArray = new string[6];

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

一維數組
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; 超出索引範圍

int a = array[2];

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

string b = ss[2];

輸入三個人名放入數組
string[] name = new string[3];
//Console.Write("請輸入第一個人名：");
//name[0] = Console.ReadLine();
//Console.Write("請輸入第二個人名：");
//name[1] = Console.ReadLine();
//Console.Write("請輸入第三個人名：");
//name[2] = Console.ReadLine();
for (int i = 1; i <= 3; i++)
{
Console.Write("請輸入第{0}個人名：",i);
name[i - 1] = Console.ReadLine();
}

//根據班級人數創建一個數組，要求每個人的姓名都要放進去
Console.Write("請輸入班級人數：");
int n = int.Parse(Console.ReadLine());
string [] name =new string[n];
for (int i = 0; i < n; i++)
{
Console.Write("請輸入第{0}個人的姓名：",i+1);
name[i] = Console.ReadLine();
}
Console.WriteLine("所有人員姓名輸入完畢，請按回車鍵查看所有人員姓名！");
Console.ReadLine();
Console.WriteLine();
for (int i = 0; i < n; i++)
{
Console.Write(name[i]+"\t");
}
Console.ReadLine();

從控制台輸入班級人數
將每個人的年齡放入數組，
將所有人的年齡求總和
求平均年齡
求年齡最大
Console.Write("請輸入班級人數：");
int n = int.Parse(Console.ReadLine());
int [] age = new int[n];
int sum = 0;
for (int i = 0; i < n; i++)
{
Console.Write("請輸入第{0}個人的年齡：",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("最大年齡是："+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();

課後題

雙色球：從33個紅球中隨機六個，按從小到大順序排序，從16個藍球中選取一個。

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("紅球：");
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("藍色："+c);
}