public Server(
     CPU cpuOfComputer, 
     RAM ramOfComputer, 
     HardDrive hardDriveOfComputer,
     VideoCard videoCardOfComputer)
     : base(ComputerType.PC, cpuOfComputer, ramOfComputer, hardDriveOfComputer, videoCardOfComputer, null)
 {
     this.motherboard = 
         new Motherboard(this.CpuOfComputer, this.RamOfComputer, this.HardDriveOfComputer, this.VideoCardOfComputer);
 }
 public Laptop(
     CPU cpuOfComputer, 
     RAM ramOfComputer, 
     HardDrive hardDriveOfComputer, 
     VideoCard videoCardOfComputer, 
     Battery laptopBattery)
     : base(ComputerType.PC, cpuOfComputer, ramOfComputer, hardDriveOfComputer, videoCardOfComputer, laptopBattery)
 {
     this.motherboard = 
         new Motherboard(this.CpuOfComputer, this.RamOfComputer, this.HardDriveOfComputer, this.VideoCardOfComputer);
 }