var关键字

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

namespace FirstPriject
{
    class Program
    {
        static void Main(string[] args)
        {
            //声明并初始化变量
            var name = "张三";
            var age = 10;
            var sex = true;

            //获取变量的数据类型
            Type t_Name = name.GetType();
            Type t_Age = age.GetType();
            Type t_Sex = sex.GetType();

            //打印结果
            Console.WriteLine("变量name的类型是{0},变量age的类型是{1},变量sex的类型是{2}",
                t_Name.ToString(),t_Age.ToString(),t_Sex.ToString());

            //不自动关闭控制台，等待输入
            Console.ReadLine();
        }
    }
}