Create a simple calculator with Visual Basic 6Steps
1Open Visual Basic 6.0 and create a newStandard EXE
Project.Standard EXE projects give you a handful of commands and
tools, useful to develop simple as well as semi-complex
programs.You can also choose aVB Enterprise Edition Projectwhich
will give you a lot more tools to work with. For a beginner
programmer, it is suggested to use a Standard EXE Project.Ad
2Understand the project screen.In the center of the screen will
be a box with a lot of dots. This is your form. A form is the place
where you will add the various elements (command buttons, pictures,
text boxes, etc) to your program.To the left of the screen is the
toolbox. The Toolbox contains various pre-defined elements of any
program. You can drag and drop these elements onto your form.To the
lower right of the screen is the form layout. This determines where
your program will be displayed on the screen once the project is
complete and executed.On the mid-right is the properties box which
determine the property of any element that is selected in a form.
You can change various properties using this. If no element is
selected, it displays the properties of the form.On the top-right
is the project explorer. It shows the various designs, forms that
are included in a project.If any of these boxes is missing, you can
add them by clicking on the "View" button on the Menu bar.
3Drag a label onto the form, and change the caption of the label
to "Enter first number".The caption of a label can be changed using
the properties box.
4Create a textbox to the right of the first label.Remove any
text that appears inside the textbox by changing blanking the
"Text" field in properties box.
5Create another label and change the caption to "Enter second
number" and create another textbox to its right.
6Drag and create four command buttons below these two
labels.Change the caption of these command buttons to "Add",
"Subtract", "Multiply", "Divide" respectively.
7Create another label with a caption "Result" and a textbox to
the right of it below the four command buttons.This textbox will be
used to display the result. With this, your design is complete.
8To start coding, in the project explorer, click on the form and
then select the left-most button.It will take you to the coding
screen.Click on the list box in the top-left of the coding screen.
One by one, click on all the commands (Command1, Command2, etc) so
that the outline coding of them will be visible to you on your
coding screen.
9Declare the variables.To declare:Dim a, b, r as Integerais the
value entered in the first textbox,bis the value entered in the
second textbox andris the result. You can any other variables
too.
10Start the coding for the add command (Command1).The code will
be as follows:Private Sub Command1_Click()a = Val(Text1.Text)b =
Val(Text2.Text)r = a + bText3.Text = rEnd Sub
11Code for the subtract command (Command2).The code will be as
follows:Private Sub Command2_Click()a = Val(Text1.Text)b =
Val(Text2.Text)r = a - bText3.Text = rEnd Sub
12Code for the multiply command (Command3).The code will be as
follows:Private Sub Command3_Click()a = Val(Text1.Text)b =
Val(Text2.Text)r = a * bText3.Text = rEnd Sub
13Code for the divide command (Command4).The coding will be as
follows:Private Sub Command4_Click()a = Val(Text1.Text)b =
Val(Text2.Text)r = a / bText3.Text = rEnd Sub
14Click the start button or press F5 to execute your
program.Test all the commands and see if your program is
working.
15Save your project and your form.Make your project and save it
as a.exefile on your computer; run it whenever you want!