Ps4 lesson 1

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1.2 What is Visual Basic?

VISUAL BASIC is a high level programming language which evolved from the earlier DOS version called BASIC. BASIC means Beginners' All-purpose
Symbolic Instruction Code. It is a very easy programming language to learn. The code looks a lot like English Language. Different software
companies produced different versions of BASIC, such as Microsoft QBASIC, QUICKBASIC, GWBASIC , IBM BASICA and so on. However, people 6
Lesson1 : Introduction to Visual Basic
prefer to use Microsoft Visual Basic today, as it is a well-developed programming language and supporting resources are available everywhere.
Now, there are many versions of VB exist in the market, the most popular one and still widely used by many VB programmers is none other than
Visual Basic 6. We also have VB.net, VB2005 and the latest VB2008, which is a fully object oriented programming (OOP) language. It is more
powerful than VB6 but looks more complicated to master.

VISUAL BASIC is a VISUAL and events driven Programming Language. These are the main divergence from the old BASIC. In BASIC, programming is
done in a text-only environment and the program is executed sequentially. In VB, programming is done in a graphical environment. In the old
BASIC, you have to write program code for each graphical object you wish to display it on screen, including its position and its color. However, In
VB , you just need to drag and drop any graphical object anywhere on the form, and you can change its color any time using the properties
windows.

On the other hand, because the user may click on certain object randomly, so each object has to be programmed independently to be able to
response to those actions (events). Therefore, a VB Program is made up of many subprograms, each has its own program code, and each can be
executed independently and at the same time each can be linked together in one way or another.

1.3 What programs can you create with Visual Basic 6?

With VB 6, you can create any program depending on your objective. For example, if you are a college or university lecturer, you can create
educational programs to teach business, economics, engineering, computer science, accountancy , financial management, information system and
more to make teaching more effective and interesting. If you are in business, you can also create business programs such as inventory
management system, point-of-sale system, payroll system, financial program as well as accounting program to help manage your business and
increase productivity. For those of you who like games and working as games programmer, you can create those programs as well. Indeed, there is
no limit to what program you can create! There are many such programs in this tutorial, so you must spend more time on the tutorial in order to
learn how to create those programs.

1.4 The Visual Basic 6 Integrated Development Environment

Before you can program in VB 6, you need to install Visual Basic 6 in your computer.
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2.1 Creating Your First Application

In this section, we will not go into the technical aspects of Visual Basic programming yet, what you need to do is just try out the examples below to
see how does in VB program look like:

Example 2.1.1 is a simple program. First of all, you have to launch Microsoft Visual Basic 6. Normally, a default form with the name Form1 will be
available for you to start your new project. Now, double click on Form1, the source code window for Form1 as shown in figure 2.1 will appear. The
top of the source code window consists of a list of objects and their associated events or procedures. In figure 2.1, the object displayed is Form and
the associated procedure is Load.

When you click on the object box, the drop-down list will display a list of objects you
have inserted into your form as shown in figure 2.2. Here, you can see a form with
the name Form1, a command button with the name Command1, a Label with the
name Label1 and a Picture Box with the name Picture1. Similarly, when you click on
the procedure box, a list of procedures associated with the object will be displayed as
shown in figure 2.3. Some of the procedures associated with the object Form1 are
Activate, Click, DblClick (which means Double-Click) , DragDrop, keyPress and more.
Each object has its own set of procedures. You can always select an object and write
codes for any of its procedure in order to perform certain tasks.

You do not have to worry about the beginning and the end statements (i.e. Private
Figure 2.1 Source Code Window Sub Form_Load.......End Sub.); Just key in the lines in between the above two
statements exactly as are shown here. When you press F5 to run the program, you
will be surprise that nothing shown up .In order to display the output of the program,
you have to add the Form1.show statement like in Example 2.1.1 or you can just use
Form_Activate ( ) event procedure as shown in example 2.1.2. The command Print
does not mean printing using a printer but it means displaying the output on the
computer screen. Now, press F5 or click on the run button to run the program and
you will get the output as shown in figure 2.4.

You can also perform arithmetic calculations as shown in example 2.1.2. VB uses * to
denote the multiplication operator and / to denote the division operator. The output
is shown in figure 2.3, where the results are arranged vertically.
Figure 2.2 Lists of Object

Private Sub Form_Load ( )
Form1.show
Print “Welcome to Visual Basic tutorial”
End Sub
Example 2.1.1

Private Sub Form_Activate ( )
Print 20 + 10
Print 20 - 10
Print 20 * 10
Print 20 / 10
End Sub
Example 2.1.2 Figure 2.3: List oOf Procedures

You can also use the + or the & operator to join two or more texts (string) together like
in example 2.1.4 (a) and (b)

Private Sub Private Sub
A = Tom A = Tom
B = “likes" B = “likes"
C = “to" C = “to"
D = “eat" D = “eat"
E = “burger" E = “burger"
Print A + B + C + D + E Print A & B & C & D & E
End Sub End Sub
Example 2.1.4 (a) Example 2.1.4 (b)
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Figure 2.4: The output of example 2.1.1

2.2 Steps in Building a Visual Basic Application

Step 1 : Design the interface
Step 2 : Set properties of the controls (Objects)
Step 3 : Write the event procedures

The Output of Example 2.1.4(a) &(b) is
as shown in Figure 2.7.

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Ps4 lesson 1

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