I have started programming in VB just 1 an half months before but for implementing program logic I still have a problem, here I have a class called book shelf and books and classes which is to be a module sub main.
I have a box of execution during debugging which tells me: Object reference not set to an instance of an object.
C code is as follows:
class book
Code:
Public Class Book
Private _titre As String
Public Sub New ()
End Sub
Property title ()
Get
Return _titre
End Get
Set (ByVal value)
_titre = value
End Set
End Property
End Class
Class shelf:
Code:
Public Class stager
Private t () As book a table books
As Integer Public nb
Dim j As Integer 'the number of books in the existing floor
Sub New ()
End Sub
Sub New (ByVal nombrlivre As Integer) 'the programmer chooses the number of books that may contain un stage
deliver = nb - 1
ReDim t (nb)
t (nb) = New Book
End Sub
Sub ajouter_livre (ByVal title As String)
If j <= nb Then we added provided that it not exceed the number of book that can hold the floor
T (j). Titr title = 'the program hangs here
j = j + 1
Else
Console.WriteLine ( "The floor is full")
End If
End Sub
End Class
How do i test the above program using a module whether this written code is working fine.
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