static void Main(string[] args) { Car renault = new Car("Renault", "green", 15000); Car citroen = new Car("Citroen", "white", 10000); Car opel = new Car("Opel", "black", 20000); Car newOpel = new Car("Opel", "black", 18000); renault.ChangePrice(90); citroen.ChangePrice(90); opel.ChangePrice(90); renault.Print(); citroen.Print(); opel.Print(); renault.ChangeColorIfItIsWhite("blue"); citroen.ChangeColorIfItIsWhite("blue"); CompareCars(opel, newOpel); CompareCars(renault, citroen); }