学习C#基础必看案例

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            //Random随机数            Random r = new Random();            while (true)            {                int i = r.Next(1, 7);                Console.WriteLine(i);                Console.ReadKey();                            }            //指定分隔符数组,返回不带空格符的字符串            string str = "my         name                   is lei";            char[] a = { ' ' };            string[] b = str.Split(a,StringSplitOptions.RemoveEmptyEntries);            for (int i = 0; i < b.Length; i++)            {                Console.WriteLine(b[i]);            }            Console.ReadKey();            //倒序输出            Console.WriteLine("请输入字符串");            string a = Console.ReadLine();            string[] d = a.Split(' ');            for (int i = d.Length - 1; i >= 0;i-- )            {                Console.Write(d[i]+" ");            }            Console.ReadKey();           //忽略大小写            string a = "a";            string b = "A";            if (a.Equals(b,StringComparison.OrdinalIgnoreCase))            {                Console.WriteLine("一样的");            }            else { Console.WriteLine("不一样"); }                        Console.ReadKey();            //字符替换            string a = "2008-11-12";            string[] b = a.Split('-');            Console.WriteLine("{0}年{1}月{2}日", b);            Console.ReadKey();            //九九乘法表            for (int i = 1; i <= 9;i++ )            {                                 for (int j = 1; j <= i;j++ )                {                                        Console.Write("{0}X{1}={2:00}   ",i,j,i*j);                }                Console.WriteLine();            }            Console.ReadKey();            //判断字符串内是否有指定的子字符串            string[] strc = { "xxoo", "TMD", "和谐" };            string a = Console.ReadLine();            int i;            for (i = 0; i < a.Length; i++)            {                if (a.Contains(strc[i]))                {                    break;                }            }            if (i < a.Length)            {                Console.WriteLine("有非法字符");            }            else            {                Console.WriteLine("合法");            }            //水仙花规则            //int i = 1 * 1 * 1 + 5 * 5 * 5+3 * 3 * 3;                        //求100_999的水仙花数            for (int i = 100; i <= 999;i++ )            {                 //把个 十 百  分离出来                int ge=i%10;                int shi=i/10%10;                int bai=i/100;                //按照水仙花数规则判断                if(i==ge*ge*ge+shi*shi*shi+bai*bai*bai )                {                    Console.WriteLine(i);                }            }            Console.ReadKey();           // 求1_100直接的偶数和            int sum = 0;            for (int i = 1; i <= 100;i++ )            {                //如果i能被2整除说明这个数是偶数                if(i%2==0)                {                    sum += i;                    Console.WriteLine(i);                }            }            Console.WriteLine(sum);            Console.ReadKey();        }
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