static void Main(string[] args)
{
Rational x = new Rational();
Rational y = new Rational(3);
Rational w = new Rational(9, 8);
Rational z = new Rational(4, 7);
Console.WriteLine("So, we have created the 4 rational objects.\n");
Console.WriteLine($"a:{x}, b:{y}, c:{w}, d{z}\n");
x.IncreaseBy(w);
Console.WriteLine($"If we add a nd c the result is {x}.\n");
z.DecreaseBy(w);
Console.WriteLine($"If we subtract d nd c the result is {z}.\n");
}
