using System;

public class Program

{

    public static void Main()

    {

        // DECLARACION DE VARIABLE

        double decimal1  = 2;

        double decimal2 = 7.8;

        double decimal3 = 9.0;

        //proceso

        decimal1 = decimal2 + decimal3;

        decimal2 = decimal1 + decimal3;

        // SALIDA

        Console.WriteLine("DECIMAL1;" + decimal1);

        Console.WriteLine("DECIMAL2;" + DECIMAL2);

        Console.ReadKey();

    }

}