static void Main(string[] args)
{
//Person person1 = new Person();
//person1.Person1("nhat");
//Console.WriteLine(person1.SayName());
//Console.ReadKey();
Rec area = new Rec();
area.SetSize(30, 20);
Console.WriteLine(area.GetArea());
int result = area.GetPerimeter();
Console.WriteLine(result);
//Calculation cal = new Calculation();
//int x=200;
//int y = 300;
//int resultFM = cal.FindMax(x, y);
//Console.WriteLine(resultFM);
Calculation cal = new Calculation();
int resultFM;
resultFM = cal.FindMax(20, 30);
Console.WriteLine(resultFM);
Console.ReadKey();
}