Leap Year in Visual Basic

 A simple program that I wrote using Visual Basic 6 to ask the user to give a starting year and ending year and then the program will generate the list of years based on the given starting and ending years of the user.

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Program Listing

Option Explicit

Public Function IsLeapYear0(ByVal y As Integer) As Boolean

    On Error Resume Next

    IsLeapYear0 = False

    'If the year is evenly divisible by 4 and not by 100, then this

    'is a leap year.

    If y Mod 4 = 0 And y Mod 100 <> 0 Then

        IsLeapYear0 = True

        'If the year is evenly divisible by 4 and 100, then check to

        'see if the quotient of year divided by 100 is also evenly

        'divisible by 4. If it is, then this is a leap year.

    ElseIf y Mod 4 = 0 And y Mod 100 = 0 Then

        If (y \ 100) Mod 4 = 0 Then IsLeapYear0 = True

    End If

End Function

Private Sub Command1_Click()

Dim y As Integer

    For y = Val(Text1.Text) To Val(Text2.Text)

        If IsLeapYear0(y) Then lstLeapYears(0).AddItem y

    Next y

End Sub

Private Sub Command2_Click()

Text1.Text = ""

Text2.Text = ""

lstLeapYears(0).Clear

Text1.SetFocus

End Sub

Private Sub Command3_Click()

End

End Sub