namespace OOP {
class GSM {
private string model;
private string manufacturer;
private decimal ? price;
private string owner;
private Battery battery;
private Display display;
public GSM(): this("Unknown Model", "Unknown Manifacturer") {}
public GSM(string model, string manifacturer): this(model, manifacturer, null) {}
public GSM(string model, string manifacturer, decimal ? price): this(model, manifacturer, price, null) {}
public GSM(string model, string manifacturer, decimal ? price, string owner): this(model, manifacturer, price, owner, null) {}
public GSM(string model, string manifacturer, decimal ? price, string owner, Battery battery): this(model, manifacturer, price, owner, battery, null) {}
public GSM(string model, string manifacturer, decimal ? price, string owner, Battery battery, Display display) {
this.model = model;
this.manufacturer = manifacturer;
this.price = price;
this.owner = owner;
this.battery = battery;
this.display = display;
}
}
}