static void Main(string[] args)
        {
            var name = "小胡子";
            var age = 26;
            var email = "xiaohuzi@xiaohuzi.com";
            var salary = 3700.21;
            var today = DateTime.Now;

            Console.WriteLine($"我叫{name}, 今年{age}岁，我的邮箱是{email}! 现在时间是{today:d}");
            
            //左对齐, 右对齐, 货币格式, 三元表达式
            Console.WriteLine($"姓名 [{name,-10:d}] \r\n工资 [{salary,12:C2}] \r\n类别 [{(salary < 5000?  "不交税":"交税")}]");

            Console.ReadKey();
        }