by Sameet Natekar (6 Submissions)
Category: Math/Dates
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Sat 29th January 2005
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Generates and Displays the Fibonacci Series
API Declarations
'3 command buttons (1 to generate the fib series, 1 to clear it and the 3rd to exit.
'you will also require a list box to display the series.
'Do not change the names of the components
' Fibonacci series is 0, 1, 1, 2, 3, 5, 8, 13, 21, 34....... where a number in the series is the sum of the previous 2 nos.
'first 2 nos r 0 and 1.
VBcoders
If Text1.Text > 47 Then
MsgBox ("Please enter a number > 47 else you will get an 'Overload Error'")
Else
List1.Clear
Dim x, i As Integer
x = Text1.Text - 1
Dim fib(50) As Long
fib(0) = 0
fib(1) = 1
For i = 2 To x Step 1
fib(i) = fib(i - 2) + fib(i - 1)
Next
For i = 0 To x
List1.AddItem fib(i)
Next
End If
End Sub
Private Sub Command2_Click()
Dim rep As String
rep = MsgBox("Are you sure you want to clear the box?", vbYesNo, "Clearance Confirmation.")
If rep = vbYes Then
List1.Clear
End If
End Sub
Private Sub Command3_Click()
End
End Sub
Private Sub Text1_Change()
'Textbox will accept only nos, no alphabets, symbols or even decimal points.
Dim ltr As String
Dim dis As Integer
dis = 1
n = Len(Text1.Text)
For i = 1 To n
ltr = Mid(Text1.Text, i, 1)
If Not (ltr >= "0" And ltr <= "9") Then
dis = dis * 0
End If
Next
If dis = 0 Then
Command1.Enabled = False
Else
Command1.Enabled = True
End If
End Sub
