public static void Main()
Console.WriteLine("Introduce numero");
float n1 = float.Parse(Console.ReadLine());
Console.WriteLine("Introduce operador");
string op = Console.ReadLine();
Console.WriteLine("Introduce numero");
float n2 = float.Parse(Console.ReadLine());
Console.WriteLine( " La suma " + n1+ "y" + n2 + "es " +( n1 + n2) );