c#

1.HelloWorld

using System; //注释：引入命名空间

namespace _001
{
    //Pragram类
    class Pragram
    {
        //Main方法
        static void Main()
        {
            // ctrl+k  ctrl+c  组合键 注释
            // ctrl+k  ctrl+u  组合键 取消注释
            Console.WriteLine("Hello World! 1 ");//输出语句
      
            /*
             
            多行注释
            多行注释
             */
            Console.WriteLine("Hello World! 2 ");
            Console.WriteLine("Hello World! 你好! 3 ");

            Console.Write("Hello World! 4 ");
            Console.Write("Hello World! 5 ");
            Console.Write("Hello World! 6 ");


            Console.WriteLine("Hello " +
                "World! ");
            Console.WriteLine("Hello ");
            Console.WriteLine("World ");
            Console.WriteLine("He\tllo \nWorld! ");//  转义字符  \t制表符  \n换行符

            Console.WriteLine("dsy说:\"Hello\" ");


        }
    }
}