关于sizeof,typeof

using System;
using System.Text;
using System.Collections.Generic;

public class Class1
{
    public Class1()
    {
        
    }
    static void Main(String[] args)
    {
        Double dl = 3.1546;
        int getType=sizeof(double);
        Console.WriteLine(getType.ToString());//putout:8
        Type gtype = dl.GetType();
        Type g_type=typeof(int);
        Console.WriteLine(g_type.ToString());//putout:System.Int32
        Console.WriteLine(gtype.ToString());//putout:System.Double
        Type s_Short=typeof(short);
        Console.WriteLine(s_Short.ToString());//output:System.Int16
    }
}