A Calculator Project in VB NET

In the next few pages, you’re going to create a Calculator. It won’t be a very
sophisticated calculator, and the only thing it can do is add up. What the project
will give you is more confidence in using variables, and shifting values from
one control to another. So create a new project, call it Calculator,
and let’s get started.

Designing the Form

Let’s design the form first. What does a calculator need? Well numbers, for
one. A display area for the result. A plus sign button, an equals sign button,
and a clear the display button.

Here’s how our calculator is going to work. We’ll have 10 button for the numbers
0 to 9. When a button is clicked its value will be transferred to a display
area, which will be a Textbox. Once a number is transferred to the Textbox we
can click on the Plus button. Then we need to click back on another number.
To get the answer, we’ll click on the equals sign. To clear the display, we’ll
have a Clear button.

If you haven’t already, create a new project. Save it as Calculator. To your
new form, first add ten Buttons (You can add one, then copy and paste the rest).
The Buttons should have the following Properties:

Name: btn Plus a Number (btnOne, btnTwo, btnThree, etc)

Text: A number from 0 to 9. A different one for each button, obviously

Font: MS Sans Serif, Bold, 14

Next, add a Textbox. Set the following properties for the Textbox:

Textbox
Name: txtDisplay
Font: MS Sans Serif, Bold, 14
Text: Erase the default, Textbox1,
and leave it blank

Three more buttons need to be added

Plus Button
Name: btnPlus
Font: MS Sans Serif, Bold, 14
Text: +

Equals Button
Name: btnEquals
Font MS Sans Serif, Bold, 14
Text: =

Clear Button
Name: btnClear
Font MS Sans Serif, Bold, 14
Text: Clear

When your form design is finished, it might look something like this:

So if you wanted to add 5 + 9, you would click first on the 5.
A 5 would appear in the textbox. Then you would click the + symbol. The 5 would
disappear from the textbox. Next, click on the 9. The number 9 would appear
in the textbox. Finally, click on the = symbol. The 9 would disappear from the
textbox, and the answer to our sum would replace it. We would then click the
Clear button to clear the display.

In the next section, we’ll make a start on the VB NET code for
the all those buttons.

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