步步为营-10-string的简单操作

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

namespace 字符串的简单练习
{
    class Program
    {
        static void Main(string[] args)
        {
            
        }

        private static void Test9()
        {
            //数组的转置
            string[] countrys = { "中", "德", "美", "法", "日" };
            Rever(countrys);
            foreach (var item in countrys)
            {
                Console.WriteLine(item);
            }
            Console.Read();
        }

        private static void Test8()
        {
            //求员工工资文件中，员工的最高工资、最低工资、平均工资
            string[] lines = File.ReadAllLines(@"C:UsershomeDesktop1.txt", Encoding.Default);//读取
            double[] salays = new double[lines.Length];
            //string[] a = new string[lines.Length];
            for (int i = 0; i < lines.Length; i++)
            {
                //此时 "zhangsan","12"
                salays[i] = Convert.ToDouble(lines[i].Split(new char[2] { ',', '"' }, StringSplitOptions.RemoveEmptyEntries)[1]);

            }
            double sum = 0;
            double min = salays[0];
            double max = salays[0];
            for (int i = 0; i < salays.Length; i++)
            {
                sum += salays[i];

                if (max < salays[i])
                {
                    max = salays[i];
                }
                if (min > salays[i])
                {
                    min = salays[i];
                }
            }
            Console.WriteLine("最高工资{0}最低工资{1}平均工资{2}", max, min, sum / salays.Length);
            Console.Read();
        }

        private static void Test7()
        {
            ///“192.168.10.5[port=21,type=ftp]”，
            ///这个字符串表示IP地址为192.168.10.5的服务器的21端口提供的是ftp服务，
            ///其中如果“,type=ftp”部分被省略，则默认为http服务。
            ///请用程序解析此字符串，然后打印出“IP地址为***的服务器的***端口提供的服务为***” 
            ///line.Contains(“type=”)。192.168.10.5[port=21]
            string address = "192.168.10.5[port=21,type=ftp]";
            //string address = "192.168.10.5[port=8080]";
            //1获取IP地址
            string ip = address.Substring(0, address.IndexOf("["));
            string port = address.Substring(address.IndexOf("=") + 1, address.IndexOf("]") - address.IndexOf("=") - 1);
            string type = "http";
            if (address.Contains("type"))
            {
                port = address.Substring(address.IndexOf("=") + 1, address.IndexOf(",") - address.IndexOf("=") - 1);
                type = address.Substring(address.LastIndexOf("=") + 1, address.IndexOf("]") - address.LastIndexOf("=") - 1);
            }
            Console.WriteLine("IP地址为{0}的服务器的{1}端口提供的服务为{2}", ip, port, type);
            Console.Read();
        }

        private static void Test6()
        {
            ///从文件路径中提取出文件名(包含后缀) 。
            ///比如从c:aewqqeqewq.txt中提取出b.txt这个文件名出来。
            ///以后还会学更简单的方式：“正则表达式”，
            ///项目中我们用微软提供的：Path.GetFileName();（更简单。）
            string str = @"c:aewqqeqewq.txt";
            int sindex = str.LastIndexOf("\");
            string result = str.Substring(sindex + 1);
            Console.WriteLine(result);
            Console.Read();
        }

        private static void Test5()
        {
            ///练习5：123-456---7---89-----123----2把类似的字符串中重复符号”-”去掉，
            ///既得到123-456-7-89-123-2. 
            ///split()、StringSplitOptions.RemoveEmptyEntries   Join()
            string str = "123-456---7---89-----123----2";
            string[] strs = str.Split(new char[] { '-' }, StringSplitOptions.RemoveEmptyEntries);
            string result = string.Join("-", strs);
            Console.WriteLine(result);
            Console.Read();
        }

        private static void Test4()
        {
            ///把csv文件中的联系人姓名和电话显示出来。
            ///姓名：张三  电话：15001111113
            string[] lines = File.ReadAllLines(@"C:UsershomeDesktop1.txt", Encoding.Default);//读取
            foreach (string item in lines)
            {
                //此时 "","","12"
                string[] Tele = item.Split(new char[2] { '"', ',' }, StringSplitOptions.RemoveEmptyEntries);
                Console.WriteLine("姓名:{0}   电话:{1}", Tele[0] + Tele[1], Tele[2]);
            }
            Console.Read();
        }

        private static void Test3()
        {
            //”2012年12月21日”从日期字符串中把年月日分别取出来，打印到控制台
            string str = "2012年2月21日";
            int yearIndex = str.IndexOf("年");
            int moonIndex = str.IndexOf("月");
            int dayIndex = str.IndexOf("日");
            string year = str.Substring(0, yearIndex);
            string moon = str.Substring(yearIndex + 1, moonIndex - yearIndex - 1);
            string day = str.Substring(moonIndex + 1, dayIndex - moonIndex - 1);
            Console.WriteLine(year);
            Console.WriteLine(moon);
            Console.WriteLine(day);
            Console.Read();
        }

        private static void Test2()
        {
            //接收用户输入的一句英文，将其中的单词以反序输出。      “I love you"→“I evol uoy"
            string str = "I love you";
            //1字符串分割
            string[] strs = str.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
            foreach (string item in strs)
            {
                Console.Write(Reversal(item));
                Console.Write(" ");
            }
            Console.Read();
        }

        private static void Test1()
        {
            ///课上练习1：接收用户输入的字符串，将其中的字符以与输入相反的顺序输出。"abc"→"cba“.
            string abc = "abc";
            char[] newStrs = Reversal(abc);
            Console.WriteLine(newStrs);
            Console.Read();
        }

        //字符反转
        private static char[] Reversal(string abc)
        {
            char[] strs = abc.ToCharArray();
            char[] newStrs = new char[strs.Length];
            for (int i = 0; i < strs.Length; i++)
            {
                newStrs[i] = strs[strs.Length - i - 1];
            }
            return newStrs;
        }
        //数组的反转
        private static void Rever(string [] arry) 
        {
            for (int i = 0; i < arry.Length/2; i++)
            {
                string temp = arry[i];
                arry[i] = arry[arry.Length-1-i];
                arry[arry.Length-1-i] = temp;
            }
        }
    }
}