theme changed

labs/lab9/LearningCenter/Person.cs

@@ -0,0 +1,27 @@
+using System;
+
+abstract class Person
+{
+    public string LastName { get; }
+    public DateTime BirthDate { get; }
+
+    protected Person(string lastName, DateTime birthDate)
+    {
+        LastName = lastName;
+        BirthDate = birthDate;
+    }
+
+    public int Age()
+    {
+        var today = DateTime.Today;
+        int a = today.Year - BirthDate.Year;
+        if (BirthDate.Date > today.AddYears(-a)) a--;
+        return a;
+    }
+
+    public virtual void Show()
+    {
+        Console.WriteLine("{0}, возраст: {1}", LastName, Age());
+    }
+}
+