using System;
namespace text2
{
    class Program
    {
        static void Main(string[] args)
            
        {
            int @int = 300;  // 数据类型名  变量名 变量赋值  
           // int a;double b=12.3;a=(int)b;
int _Int;
            int a, s, d;
            a = 1; s = 2; d = 3; 
         
_Int = 100;
 Console.WriteLine("_Int=" + _Int );
          _Int = 200;
         
           Console.WriteLine("_Int="+ _Int);
           long _Long = _Int;
           short _Short = (short)_Int;// 强制转换 从大箱子拿出的东西进行强制转换
           short _Short1=  Convert.ToInt16(_Int);//用conver进行转换 常用的 
           int _Int1 = Convert.ToInt32("123");//用字符串转数值
            // int _Int=aa(int)"123";
           int b = int.Parse("123");//用parse转
           long _L = long.Parse("12121212");
           float _Float = 123.99F;
           double _Double = 1.99;
            decimal _D = 1.45M;
            _Int = (int)_Float;
          //  char_Char = ‘G‘; //字符型用单引号表示字符 int parse 不允许转小数
           bool zhen = true;
           bool jia = false;//布尔型   条件判断
            //日期时间
           DateTime dt = DateTime.Now;//当前日期时间
         
           Console.WriteLine("dt等于" + dt.ToString("yyyy:MM:dd: hh:mm:ss"));
           Console.WriteLine("dt等于" + dt.ToString("HH时mm分ss秒"));
           DateTime Today = DateTime.Today;
           Console.WriteLine("true 转换成_Int等于" + true);
           Console.WriteLine("false 转换成_Int等于" + false);
           
            Console.WriteLine("请输入;");
            
            string read = Console.ReadLine();
            Console.Write("您的收入是");
            Console.WriteLine(read);
           
            Console.ReadLine( );
原文:http://www.cnblogs.com/hanke123/p/4690710.html