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labs/lab3_done/IsLeapYear/Program.cs

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+using System;
+
+public class Program
+{
+    public static void Main(string[] args)
+    {
+        Console.WriteLine("input a year: ");
+        int year = int.Parse(Console.ReadLine());
+
+        if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
+        {
+            Console.WriteLine("YES");
+        }
+        else
+        {
+            Console.WriteLine("NO");
+        }
+    }
+}