Create your own Calculator Application

Requirements:


Visual Studio/ Visual basic express.

Understanding of the visual studio or visual basic environment.


1.Launch Visual Studio/ Visual Basic

2. Create a new project and name it whatever you want, e.g Calculator.

3. how to use visual basic

Leave the form in the default name, which should be "form1" or rename it if you want in the properties pane.


Now drag buttons on the form to make it look like the diagram below.

The buttons can be resized to look how you want them to look. The text box was also resized.

For the text on the buttons, click the button you want to change its
text value and go to the properties pane, you would see the text
property there. you can change it there.
















Now use the following names for the buttons on the forms.

BUTTONS
"1" - Button1
"2" - Button2
"3" - Button3
"4" - Button4
"5" - Button5
"6" - Button6
"7" - Button7
*"8" - Button8
*"9" - Button9
*"0" - Button10
*"+" - Button_Add
"" - Button_Multiply
*"-" - Button_Minus
*"=" - Button_Equal
*"C" - Button_Clear
*"/" - Button_Divide
*"." - Button_Point
Text box - Textbox1.text



















Double click on the form and add the following cod
Public Class Form1
' We create this variables as globals so they can be accessed from any where in the program.

' this variable is for the mathematical symbol clicked. e.g +, - .
Dim sign As Char
' This variable stores the first value entered by the user.
Dim first As Double
' This variable stores the second value entered by the user.
Dim second As Double
' This variable stores the answer of the calculation
Dim ans As Double
' This variable stores a value 1 or 0 to tell if the calculation is complete or not.
Dim stat As Integer

'
Sub confirm()
stat = 1
first = TextBox1.Text
End Sub
' This subroutine checks the mathematical symbol that was clicked using a select case statement.
' This is more efficient then using several if statements.
' Then its performs the calculation based on the symbol chosen.
' It then sets the calculator status to 1 to show the calculation is complete(stat=1).
' It then displays your result in the textbox (TextBox1.Text = ans)
Sub action()

Select Case sign
Case "+"
ans = first + TextBox1.Text
Case "-"
ans = first - TextBox1.Text
Case "*"
ans = first * TextBox1.Text
Case "/"
ans = first / TextBox1.Text

Case Else

End Select
stat = 1
TextBox1.Text = ans
End Sub

Sub addnum(ByRef a As String)

If TextBox1.Text = 0 Then
TextBox1.Text = a
Else
TextBox1.Text = TextBox1.Text & a
End If
If stat = 1 Then
TextBox1.Text = a
stat = 0
End If
End Sub























' using addnum() in the button click event prevents having to write the same code for every button click.
' event. The parameter in the subroutine is the number that should be added to the text button on the button click.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
addnum(1)
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
addnum(2)
End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
addnum(3)
End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
addnum(4)
End Sub

Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
addnum(5)
End Sub

Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
addnum(6)
End Sub

Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
addnum(7)
End Sub

Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click
addnum(8)
End Sub

Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click
addnum(9)
End Sub

Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click
addnum(0)
End Sub
























Private Sub Button_Add_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button_Add.Click
sign = "+"
confirm()
End Sub

Private Sub Button_Minus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button_Minus.Click
sign = "-"
confirm()
End Sub

Private Sub Button_Multiply_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button_Multiply.Click
sign = "*"
confirm()
End Sub

Private Sub Button_Divide_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button_Divide.Click
sign = "/"
confirm()
End Sub

Private Sub Button1_Clear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1_Clear.Click
TextBox1.Text = 0
stat = 0
first = TextBox1.Text
End Sub

Private Sub Button_Equal_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button_Equal.Click
action()

End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

End Sub

Private Sub Button_Point_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button_Point.Click
addnum(".")
End Sub
End Class










above this coodings



youl will


put in form 1 commands line





This tutorial need practice,accuracy ! and basics of vb..!

 Thank You! :)


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