using System;

public class Program

{

    public static void Main(String[] args)

    {

        Console.WriteLine("============================");

        Console.WriteLine("     COMPARISON BY NAIL     ");

        Console.WriteLine("============================");

        Console.WriteLine();

        double ab; // double ab

        double ac;

        double ad;

        double ae; 

        ab = 20; // double.Parse(Console.ReadLine());

        ac = 45; 

        ad = 1000; 

        ae = 750;

        Console.WriteLine("ab > ac : "); 

        Console.WriteLine(ab > ac); 

        Console.WriteLine("ab < ac");

        Console.WriteLine(ab < ac);

        Console.WriteLine("ac == ad");

        Console.WriteLine(ac == ad);

        Console.WriteLine("ac != ad");

        Console.WriteLine(ac != ad);

        Console.WriteLine("ad >= ae");

        Console.WriteLine(ad >= ae);

        Console.WriteLine("ad <= ae");

        Console.WriteLine(ad <= ae);

    }

}

​

​

​