using System;

public class Program

{

    public static void Main()

    {

        int a = 12_2323_2;

        Console.WriteLine("Senza underscore: " + a);

        double d = 130.78;

        float f = 13.5f;

        decimal dm = 1500.456m;

        double ne = 5e-7;

        var s = "type interface";

​

​

       Console.WriteLine("float {0} double {1} decimal {2} double {3} double {4} var {5}",f,d,dm,ne,ne.ToString("0.#########"),s);

       Console.WriteLine($"float {f} double {d} decimal {dm} double {ne} double {ne.ToString("0.#########")} var {s}");

    }

}