June 2018 Update

Task/Leap-year/Visual-Basic/leap-year-1.vb

@@ -0,0 +1,9 @@
+Public Function IsLeapYear1(ByVal theYear As Integer) As Boolean
+'this function utilizes documented behaviour of the built-in DateSerial function
+IsLeapYear1 = (VBA.Day(VBA.DateSerial(theYear, 2, 29)) = 29)
+End Function
+
+Public Function IsLeapYear2(ByVal theYear As Integer) As Boolean
+'this function uses the well-known formula
+IsLeapYear2 = IIf(theYear Mod 100 = 0, theYear Mod 400 = 0, theYear Mod 4 = 0)
+End Function

Task/Leap-year/Visual-Basic/leap-year-2.vb

@@ -0,0 +1,7 @@
+Sub Main()
+'testing the above functions
+Dim i As Integer
+  For i = 1750 To 2150
+    Debug.Assert IsLeapYear1(i) Eqv IsLeapYear2(i)
+  Next i
+End Sub