-----------------------------------------------------------------集合
ArrayList al = new ArrayList();
al.Add(3);//从末位开始添加
al.Add(5);
al.Add(7);
al.Add(7);
al.Add(11);
al.Add(13);
al.Insert(1,9);//插入
//al.Remove(7);//只能删一个
al.RemoveAt(5);//删索引
Console.WriteLine(al.IndexOf(7));//输出第一个7的索引
Console.WriteLine(al.LastIndexOf(7));//输出最后一个7的索引
if (al.Contains(5))//包含
{
Console.WriteLine(al.IndexOf(5));
}
for (int i = 0; i <al.Count ; i++)//al的长度count
{
Console.WriteLine(al[i]);
}
------------------------------------------------------
Console.WriteLine("请输入人数：");
int n = Convert.ToInt32(Console.ReadLine());
ArrayList al = new ArrayList();
double sum = 0,p=0;
for (int i = 0; i < n; i++)
{
Console.WriteLine("请输入第"+(i+1)+"个人的分数：");
double x = Convert.ToDouble(Console.ReadLine());
al.Add(x);
sum = sum + x;
}
p = sum / n;
Console.Write("平均分：" +p + " "+"总分：" +sum+ "
");
for (int i = 0; i < n; i++)
{
if (Convert.ToInt32( al[i])<=60)
{
Console.Write("第"+(i+1)+"个不及格，分数："+al[i]+" ");
}
}
Console.WriteLine();
foreach (var item in al)
{
Console.Write(item + " ");
}
Console.WriteLine();
al.Sort();//排序
for (int i = 0; i < al.Count; i++)
{
Console.Write(al[i] + " ");
}
Console.WriteLine();
al.Reverse();
foreach (var item in al)
{
Console.Write(item + " ");
}
----------------------------------------------stack 集合 先进后出
Stack ss = new Stack();
ss.Push(1);
ss.Push(2);
ss.Push(3);
ss.Push(4);
ss.Push(5);
foreach (var item in ss)
{
Console.WriteLine(item);//先进后出；无索引
}
Console.WriteLine("有"+ss.Count+"个元素");
for (int i = 0; i < 2; i++)
{
string m = ss.Pop().ToString();
Console.WriteLine("tanchu元素wei"+m);
}
//ss.Clear();
Stack cl = (Stack)ss.Clone();
Console.WriteLine("有" + cl.Count + "个元素");
string n = ss.Peek().ToString();
Console.WriteLine("最后一个进入元素为" + n);
Console.ReadKey();
------------------------------------------------------------queue集合 先进先出
Queue q = new Queue();
q.Enqueue(1);//tianjia
q.Enqueue(2);
q.Enqueue(5);
q.Enqueue(7);
q.Enqueue(9);
foreach (var item in q)
{
Console.WriteLine(item);
}
Console.WriteLine("有" + q.Count + "个元素");
int xc = int.Parse(q.Dequeue().ToString());//yichu
Console.WriteLine("移除第一个元素" +xc);
foreach (var item in q)
{
Console.WriteLine(item);
}
Console.WriteLine("剩" + q.Count + "个元素");
int dq = int.Parse(q.Peek().ToString());//duqu
Console.WriteLine("duqu元素" + dq);
bool c = q.Contains(7);//判断q集合里面有没有7
Console.WriteLine("q集合里面有7：" + c);
Console.ReadKey();
-------------------------------------------------------------------哈希表 先进后出
Hashtable h = new Hashtable();
double sum = 0, pj;
int m = 0;
h.Add("王一",80);
h.Add("李一",90);
h.Add("张一",56);
h.Add("杨一", 100);
h.Add("田一", 74);
h.Add("罗一", 60);
// for (int i = 0; i < h.Count; i++)
foreach (var i in h.Values)
{
sum = sum + Convert.ToDouble( i);
if (Convert.ToDouble( i)<60)
{
m++;
Console.WriteLine("不及格分数是"+i);
}
}
pj = sum / h.Count;
Console.Write("平均分：" + pj + " " + "总分：" + sum + "
");
Console.WriteLine("不及格的有" +m + "个");
---------------------------------------------------------------用ArrayList
ArrayList a = new ArrayList();
double sum = 0, pjf = 0;
int m = 0;
//a.Add("王一");
//a.Add(80);
//a.Add("李一");
//a.Add(30);
//a.Add("张一");
//a.Add(87);
//a.Add("王五");
//a.Add(50);
//a.Add("杨一");
//a.Add(100);
//a.Add("刘一");
//a.Add(70);
//a.Add("罗一");
//a.Add(60);
Console.WriteLine("请输入您要录入的人数：");
int n = Convert.ToInt32(Console.ReadLine());
for (int i = 0; i < n; i++)
{
Console.WriteLine("请输入您要录入的人的姓名：");
a.Add(Console.ReadLine());
Console.WriteLine("请输入您要录入的分数：");
a.Add(Convert.ToDouble(Console.ReadLine()));
}
for (int i = 1; i <= a.Count; i+=2)
{
sum=sum+Convert.ToDouble( a[i]);
if (Convert.ToDouble( a[i])<60)
{
m++;
Console.WriteLine("不及格人有" +a[i-1]);
Console.WriteLine("不及格分数是" + Convert.ToDouble(a[i]));
}
}
pjf = 2*sum /a.Count ;
Console.Write("平均分：" + pjf + " " + "总分：" + sum + "
");
Console.WriteLine("不及格的有" + m + "个");
Console.ReadKey();
-----------------------------------------------------用Hashtable
Hashtable h = new Hashtable();
double sum = 0, pj;
int m = 0;
//h.Add("王一", 80);
//h.Add("李一", 90);
//h.Add("张一", 56);
//h.Add("杨一", 100);
//h.Add("田一", 74);
//h.Add("罗一", 60);
Console.WriteLine("请输入您要录入的人数：");
int n = Convert.ToInt32(Console.ReadLine());
for (int i = 0; i < n; i++)
{
ArrayList a = new ArrayList();
Console.WriteLine("请输入您要录入的人的姓名：");
a.Insert(0,Console.ReadLine());
Console.WriteLine("请输入您要录入的分数：");
a.Insert(1,Convert.ToDouble(Console.ReadLine()));
sum = sum + Convert.ToDouble(a[1]);
h.Add(i,a);
}
pj = sum / h.Count;
Console.Write("平均分：" + pj + " " + "总分：" + sum + "
");
foreach (ArrayList item in h.Values)
{
if (Convert.ToDouble(item) < 60)
{
m++;
Console.WriteLine("不及格的有"+item[0]+"分数是" + item[1]);
}
}
Console.WriteLine("不及格的有" + m + "个");
------------------------------------------------------------------------------------