using static System.Console;
using System.Collections.Generic;

using System;

public class Program {
	public static void Main() {
		WriteLine(typeof(Nullable).Name);
		WriteLine(typeof(Nullable<>).Name);
		int? nInt = 0;
		decimal? nDecimal = 0M;
		List<int> lInt = new List<int>();
		int xInt = 1;
		string xString = "";
		decimal xDecimal = 2M;
		Dictionary<string, int> dStingInt = new Dictionary<string, int>();
		PrintObject<int?>(nInt);
		PrintObject<decimal?>(nDecimal);
		PrintObject<List<int>>(lInt);
		PrintObject<int>(xInt);
		PrintObject<string>(xString);
		PrintObject<decimal>(xDecimal);
		PrintObject<Dictionary<string, int>>(dStingInt);
	}
	private static void PrintObject<T>(T obj) {
		var type = typeof(T); 
		var generic = type.IsGenericType;
		var nullable = generic && type.GetGenericTypeDefinition() == typeof(Nullable<>);
		WriteLine($"{type.Name} - {type.IsGenericType} - {(generic ? type.GetGenericTypeDefinition().Name : (""))} - {(nullable ? Nullable.GetUnderlyingType(type).Name : (""))} - {type.Name}\n");
	}
}

//https://pt.stackoverflow.com/q/185142/101