The document describes a program for linear search using Visual Basic 2008. The program uses one form with one group box, labels, text boxes, list boxes and buttons. The code lists the variables, components, and sub procedures used for inputting numbers, sorting using bubble sort, searching for a number, and outputting results. It allows the user to enter a number of elements, input the elements, search for a number, and displays whether it was found or not found.

1. A Program in Linear Search Using Visual Basic 2008 (version 9.0)
By Ariel T. Sumagaysay, MSCS
A. Form Design
Design the form shown below using the Visual Basic 2008:
B. Components
The following are the components of the program: 1 Form, 1 GroupBox, 4 Labels,
1 ListBox, 5 TextBoxes and 5 Buttons.

2. 2
C. Code Listings
'LINEAR SEARCH
'PROGRAM BY ARIEL T. SUMAGAYSAY
'COLLEGE OF INFORMATION & COMMUNICATION TECHNOLOGY
'WEST NEGROS UNIVERSITY
'DECEMBER 15, 2008
Public Class Form1
'Variables
Dim nNumberOfElements As Integer
Dim sNumbers As String
Dim nFind As Integer
Dim n As Integer
Dim x As Integer
Dim s As String
'One Dimensional Array
Dim aInputSet() As Integer
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
'Setting Buttons - controls
Button2.Enabled = False
Button3.Enabled = False
Button4.Enabled = False
TextBox1.Enabled = True
TextBox6.Enabled = False
TextBox7.Enabled = False
TextBox1.Text = " "
TextBox2.Text = " "
TextBox3.Text = " "
TextBox6.Text = " "
TextBox7.Text = " "
ListBox1.Items.Clear()
'Initialize variables
nNumberOfElements = 0
n = 0
x = 0
s = " "
sNumbers = " " 'Set string of numbers to NULL
nFind = 0
'Set the Number of Elements
ReDim aInputSet(0)
End Sub

3. 3
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button2.Click
'Re - setting Buttons
Button2.Enabled = False
Button3.Enabled = False
Button4.Enabled = False
Button5.Enabled = True
TextBox1.Enabled = True
TextBox6.Enabled = False
TextBox7.Enabled = False
TextBox1.Text = " "
TextBox2.Text = " "
TextBox3.Text = " "
TextBox6.Text = " "
TextBox7.Text = " "
ListBox1.Items.Clear()
'Initialize variables
nNumberOfElements = 0
n = 0
x = 0
s = " "
sNumbers = " " 'Set string of numbers to NULL
nFind = 0
'Set the Number of Elements
ReDim aInputSet(0)
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs)
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
'Terminate Program
End
End Sub
Private Sub bubblesort()
'Sort the elements using bubblesort
Static a As Integer
Static b As Integer
Static temp As Integer
Static sHereNumbers As String
'initialize variables
a = 0
b = 0
temp = 0
sHereNumbers = " "
For a = 1 To n
For b = 1 To n - 1

4. 4
If (aInputSet(b) > aInputSet(b + 1)) Then
temp = aInputSet(b)
aInputSet(b) = aInputSet(b + 1)
aInputSet(b + 1) = temp
End If
Next
Next
'display list
For a = 1 To n
sHereNumbers = sHereNumbers + Str(aInputSet(a)) & " "
TextBox3.Text = sHereNumbers
Next
'Enable Search button
Button3.Enabled = True
TextBox7.Enabled = True
End Sub
Private Sub Button5_Click_1(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button5.Click
'Setting Buttons
Button4.Enabled = True
Button5.Enabled = False
TextBox6.Enabled = True
TextBox1.Enabled = False
'Get number of elements
nNumberOfElements = CInt(TextBox1.Text)
n = nNumberOfElements
ReDim aInputSet(n)
'set command button label
s = Format(1, "0#")
Button4.Text = "&ENTER ELEMENT " + s
End Sub
Private Sub Button4_Click_1(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button4.Click
Static y As Integer
y = 0
'Enter numbers
If TextBox6.Text <> " " Then
x = x + 1
y = x
s = Format(y + 1, "0#")
Button4.Text = "&ENTER ELEMENT " + s
aInputSet(x) = CInt(TextBox6.Text)
If x = n Then
Button4.Enabled = False
TextBox6.Enabled = False
Button4.Text = "&ENTER ELEMENT"

5. 5
Call bubblesort()
End If
sNumbers = sNumbers & TextBox6.Text & " "
TextBox2.Text = sNumbers
TextBox6.Text = " "
End If
End Sub
Private Sub Button3_Click_1(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button3.Click
Static z As Integer
Static bFind As Boolean
'Setting Buttons & Initialization
Button2.Enabled = True
bFind = False
ListBox1.Items.Clear()
'Searching
nFind = CInt(TextBox7.Text)
For z = 1 To n
If nFind = aInputSet(z) Then
ListBox1.Items.Add("Number is found on location " & Str(z))
bFind = True
End If
Next
If bFind = False Then
ListBox1.Items.Add(" Number is NOT FOUND on the LIST! ")
End If
End Sub
End Class