' Visual Basic 2008 9.0 .NET Examples - Introduction to Functions - Procedures and Functions : 
Module Exercise2Solution
    Sub Main()
        Console.WriteLine(IsLeapYear(1900))
        Console.WriteLine(IsLeapYear(1996))
        Console.WriteLine(IsLeapYear(2000))
        Console.WriteLine()
        Console.WriteLine(GetDaysFebruary(1900))
        Console.WriteLine(GetDaysFebruary(1996))
        Console.WriteLine(GetDaysFebruary(2000))
        Console.WriteLine()
        Console.WriteLine(GetDays(1900, 2))
        Console.WriteLine(GetDays(1996, 2))
        Console.WriteLine(GetDays(2000, 2))
        Console.WriteLine()
        Console.WriteLine(GetDays(1900, 3))
        Console.WriteLine(GetDays(1996, 3))
        Console.WriteLine(GetDays(2000, 3))
        '
        Console.ReadLine()
    End Sub
    Function IsLeapYear(ByVal year As Integer) As Boolean
        If year Mod 4 = 0 AndAlso year Mod 100 <> 0 OrElse _
           year Mod 400 = 0 Then IsLeapYear = True
    End Function
    Function GetDaysFebruary(ByVal year As Integer) As Integer
        GetDaysFebruary = 28
        If IsLeapYear(year) Then GetDaysFebruary = 29
    End Function
    Function GetDays(ByVal year As Integer, ByVal month As Integer) As Integer
        If month = 2 Then
            GetDays = GetDaysFebruary(year)
        Else
            Dim days As Integer() = _
                           {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
            GetDays = days(month - 1)
        End If
    End Function
End Module
' Visit www.studyvb.com for more examples.  Copyright 2003-2008 De Wolf.