public static NoteBook getNotebook(String brand)
{
NoteBook nb = null;
switch (brand)
{
case "acer": nb = new acer(); break;
case "lenovo": nb = new Lenovo(); break;
case "IBM": nb = new IBM(); break;
}
return(nb);
}
static void Main(string[] args)
{
//2006年培养学员80000人，每年增长25%，请问按此增长速度，到哪一年学员数量将达到20万人？
int year = 2006;
double people = 80000;
while (people < 200000)
{
people *= 1.25;
year++;
}
Console.WriteLine("到{0}年的时候学员数量将达到20万人", year);
Console.ReadKey();
Console.WriteLine("请输入你想要买的电脑的平牌");
String brand = Console.ReadLine();
NoteBook nb = getNotebook(brand);
nb.sayhello();
Console.ReadKey();
}