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default Simple Calculator in VB

on Fri Nov 27, 2009 6:49 pm
This tutorial will demonstrate how to code up a simple calculator, note this calculator will manipulate two numbers and will not account for error catching in any great degree.

This tutorial will teach you:-

-Simple Arrays

-Manipulating numbers

-Implementing summing

Let's begin. Firstly we need to create the interface. So you'll need to crank
up ole VB. Put a text box up the top, clear it and give it a decent name like
txtDisplay, now we need to create the numbers, these will be command buttons
and must be an array, the easiest way to do this is to just create one button,
copy and paste it, and when the system asks do you want to create a control
array, you click yes! But what is and array? Well simply put it is a collection
of related variable that share the same type.

Do this for all the numbers 0
through 9, just like on Windows own calculator. Now you need to do the same
for the methods of calculation, the - + * etc. Now you should have something
that resembles a calculator. Of course these aren't the only buttons you'll
need dont forget the equals sign and of course some form of clear, I use C just
like Windows' own calculator. And now onto some coding.

We are going to need three variables, one for the first number of type double
(to hold large numbers.) one for the second number, and of course one for the
sign, or type of calculation we are doing. This is how I have declared them.


Dim first As Double
Dim second As Double
Dim sign As String



Not to bad so far, let's get those nasty arrays out of the way.


Private Sub Command1_Click(Index As Integer)
If txtDisplay.Text = "" Then
txtDisplay.Text
= Command1(Index).Caption
Else
txtDisplay.Text
= txtDisplay.Text & Command1(Index).Caption
End If
End Sub


This is the array, what this does is makes the content of the display screen
equal to the caption that has been clicked. In other words if you click the
button with 1 on it the number one will go to the display text box. The same
applies for the following array sub.

Private Sub Command2_Click(Index As Integer)
first = txtDisplay.Text
txtDisplay.Text = ""
sign = Command2(Index).Caption
End Sub


Now what this does is assign the value of the display to the first variable,
this makes it nice and easy to manipulate two numbers, it's my tip of the day,
next it clears the content of the display box and then assigns the sign to the
sign variable. And now for a minimal effort at keeping the user from crashing
it.

Private Sub Form_Load()
txtDisplay.Enabled = False
txtDisplay.MaxLength = 10
End Sub


On form load set max length of the text box to 10 and dont let anything get
stuck in the text box by any other method then hitting the command buttons.
Now lets see our hard work pay off by adding the calculation sub.

Private Sub cmdEq_Click()
second = txtDisplay.Text
If sign = "-" Then
txtDisplay.Text
= first - second
ElseIf sign = "+" Then
txtDisplay.Text
= first + second
ElseIf sign = "*" Then
txtDisplay.Text
= first * second
ElseIf sign = "/" Then
txtDisplay.Text
= first / second
End If
End Sub


Firstly the sub assigns whats in the display to the variable named second.
It then works out what calculation should be done by finding the current value
for the sign variable, so if the variable is / then it will devide the first
number by the second. And that in essence is the calculator, not to bad I thought,
and easy enough for you to build on and create a much more complex one. There
are a few mor subs we should explore but don't deserve any special attention.

Private Sub cmdDot_Click()
If InStr(txtDisplay.Text, ".") = 0 Then
txtDisplay.Text = txtDisplay.Text & "."
End If
End Sub


This tests if there is a . in the box before adding one.

Private Sub cmdClear_Click()
txtDisplay.Text = "0"
End Sub


Resets the display box.


This is all there is to writing a simple calculator program in VB it's barely
a page worth of actual code.

What you should have learned :-
-Array use
-Simple error cactching
-Using numbers in Visual Basic with mathematical calculations



This article was originally written by Sliptop
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