第六天学习内容 类

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

namespace day06
{
    class Program
    {
        static void Main(string[] args)
        {
            /*   string x = "   abc     ";
               int i = x.Length;
               Console.WriteLine(x);
               Console.WriteLine(i);
               Console.WriteLine(x.Trim().Length);  //去掉x中的空格
               Console.WriteLine(x.TrimEnd().Length);//去掉x中后面的空格
               Console.WriteLine(x.TrimStart().Length);//去掉x中前面的空格
               Console.WriteLine(x.ToUpper());  //把x中的小写转为大写

               Console.WriteLine("请输入你的身份证号");
              string x= Console.ReadLine();
              string y = x.Substring(6,8);  //截取x中从第六位开始的8个字符
              Console.WriteLine(y);
               string a=y.Substring(0,4);
               string b=y.Substring(4,2);
               string c=y.Substring(6,2);
               Console.WriteLine("您的生日是" + a + "年" + b + "月" + c + "日");
           
               Console.ReadKey();

               string z = "我小字不想混字了字";
               Console.WriteLine("你"+z.Substring(1).Replace("字了字","了").Replace("字","子")); //替换字符

//提取邮箱的用户名
            Console.WriteLine("请输入你的邮箱地址：");
            string q = Console.ReadLine();
            if (q.Contains("@"))
            {
                Console.WriteLine("您的用户名是：" + q.Substring(0, q.IndexOf("@")));
            }
            else
            {
                Console.WriteLine("您的输入有误");
            }
            Console.ReadKey(); 

            Console.WriteLine("请输入一个年份");
            string s = Console.ReadLine();
            try
            {
                DateTime dt = new DateTime();
                dt = Convert.ToDateTime(s+"/2/29");
                Console.WriteLine(s+"是闰年");
            }
            catch (Exception)
            {
                Console.WriteLine(s+"不是闰年");
               
            }
            Console.ReadKey();

            for (int i = 1; i  <= 20; i ++)
            {
                for (int j = 1; j <= 20; j++)
                {
                    if (i==9&&j==9||i==11&j==9||i==9&&j==11||i==11&&j==11||i==10||j==10)
                    {
                        Console.Write("◆");
                    }
                    else
                    {
                        Console.Write("◇");
                    }
                  
                }
                Console.Write("\n");
            }
            Console.ReadKey(); 

            string s = "helloworld";
            for (int i = 0; i < s.Length; i++)
            {
                Console.Write(s.Substring(i, 1).ToUpper()+"\t");

            }
            Console.ReadKey();

            Console.WriteLine("是否要烧开水（y/n）");
            string x = Console.ReadLine();
            if (x=="y")
            {
               
                for (int i = 0; i <= 100; i++)
                {

                    switch (i)
                    {
                        case 30:
                            Console.WriteLine("水温了");
                            break;
                        case 50:
                            Console.WriteLine("水热了");
                            break;
                        case 80:
                            Console.WriteLine("水快开了");
                            break;
                        case 100:
                            Console.WriteLine("水已经开了");
                            break;
                        default: Console.WriteLine(i);
                            break;
                    }
                }
            }
            Console.ReadKey();*/

        }
    }
}

第六天学习内容 类

标签：

原文地址：http://www.cnblogs.com/William-1234/p/4317158.html