Visual basic intoduction

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Visual Basic 2010
Introduction

Agenda
Development cycle.
Programming languages.
Object Oriented Programming.
Programming concepts.
Software.
Integrated Development Software.
Install VB 2010 Express.
VB 2010 Introduction.

System Development Cycle

Analyses

Design Testing

Programming

Compiled languages
Fast

Run time

Interpreted Languages
Slow

Run time

Object Oriented Programming

 Encapsulation.

 Inheritance.

 Polymorphism.

Encapsulation
It is the exposure of properties and methods of an
object while hiding the actual implementation of it.
In other words, the object is treated as a black
box developers who use the object should have
no need to understand how it actually works.

Inheritance
less programming is required when adding functions to
complex systems. This don by inherit all or some of
the structure and/or methods in one class to another.

Polymorphism
Example, a screen cursor may change its shape from
an arrow to a line depending on the program mode.

Classes & objects
 Consider the classes at a school; children of a

particular age may be grouped together and put in

one class. They will all learn the same set of things

and will all be tested in the same way. That doesn’t

mean everyone in a class is the same – it just means

there are certain things they have in common.

 Aly is one of the class students, so Aly is an object

inside the class. Aly have a variety of properties.

Integrated
Formed or united into a whole.‫تكامل‬

Development
A process in which something passes by degrees to a different stage.

Darwin

IDE
Integrated Development Environment

Events & Actions

 Events are things that happen to an object.

 Actions are things that an object does.

Software
Written programs or procedures or rules and associated documentation stored in
memory.

 Beta Software.

 Alpha Software.

 Software Package.

 Systems Software.

 Computer Software.

Documentation.

Dialog Box
A small temporary window in a graphical user interface, which request
information from the user; after the information has been provided the user
dismisses the box with `ok' or `cancel‘.

Install VB 2010 Express
Step BY Step

Select label1 and press control and hold it then click (select) button1

Now you can change Font property for both

Adjust AutoSize property to true then double click on Button1

Type yellow phrase between Private Sub and End Sub

Press F5 you should have this form

Let both buttons have the same size

Form_Load
• Open new VB project
• Double click on any part of the form.
 Form_Load
Object = Form
Event = Load
 Lets type something between private sub and end sub.
Me.height = 1000
Me.width = 100
Me.opacity = 0.9

Subroutine
 Open new VB project.
 Insert button from toolbox.
 Double click this button.
 And type between private sub and end sub:

– Dim prog as string ‘Declaration
– Prog = “hello world” ‘Assign value for declared
variable

– Msgbox (prog) ‘statement

VB 2010 Data Types

• Numeric data:-
– Price , weight ,age …etc

• Non-numeric data.

Numerical Data Ranges

Type Storage Range of Values
Byte 1 byte 0 to 255

Integer 2 bytes -32,768 to 32,767

Long 4 bytes -2,147,483,648 to 2,147,483,648

Single 4 bytes +/-3.402823E+38 to -1.401298E-45

Double 8 bytes +/-1.79769313486232e+308 to -4.94065645841247E-324

Currency 8 bytes -922,337,203,685,477.5808 to 922,337,203,685,477.5807

+/- 79,228,162,514,264,337,593,543,950,335 if no decimal is
Decimal 12 bytes use
+/- 7.9228162514264337593543950335 (28 decimal places).

Numerical Data
Arithmetic Operations

Operator Mathematical Function
+ Addition

- Subtraction

^ Exponential

* Multiplication

/ Division

Mod Modulus (return the remainder from an integer division)

Integer Division (discards the decimal places)

X= 13.5 Mod 12 then X = 1.5

Nonnumeric Data
Data Type Storage Range
String (fixed length) Length of string 1 to 65,400 characters
0 to 2 billion
String (variable length) Length + 10 bytes
characters
January 1, 100 to
Date 8 bytes
December 31, 9999
Boolean 2 bytes True or False

Object 4 bytes Any embedded object
Any value as large as
Variant numeric 16 bytes
Double
Same as variable-
Variant text Length+22 bytes
length string

Nonnumeric Data
String Manipulation
• Strings can be manipulated using the ‘&’ sign
and the ‘+' sign.
• In Ex 1,2,3 type this code in the button sub.
– Ex 1:-
• Dim txt1, txt2, txt3 As String
• txt1 = “hello"
• txt2 = “world"
• txt3 = text1 + text2
• Label1.Text = text3 ‘Output = helloworld

Nonnumeric Data
String Manipulation

• Ex 2:-
– Dim txt1, txt3 As String
– Dim Txt2 As Integer
– txt1 = "VB"
– txt2 = 2010
– txt3 = txt1 & txt2
– Label1.Text = text3 ‘Output = VB2010

Nonnumeric Data
String Manipulation

• Ex 3:-
– Dim txt1, txt2, txt3, txt4, txt5, txt6 As String
– txt1 = " Visual_"
– txt2 = "Basic_“
– txt3 = "2010“
– txt6 = txt1 + txt2 + txt3
– Label1.Txt = txt6 ‘Output = Visual_Basic_2010

Variable Names
• The following are the rules when naming the variables in
Visual Basic 2010:-

1. It must be less than 255 characters.
2. No spacing is allowed .
3. It must not begin with a number.
4. Period is not permitted.
• Ex:
• Student_name
• X1
• ComputerName

Declaring Variables
1. Assign name.
2. Assign data type.
• Dim variable name As Data Type
• Dim variable name, variable name As Data Type

1. Defines the number of characters the string can
hold.
• Dim variable name As String * n
• where n defines the number of characters the string can hold.
• Ex: Dim name As String * 10

Constants
• Constants values do not change during the
running of the program.
– Declaring a Constant :-
• Const constant name As Data Type = Value
– Ex: Const Pi As Single = 3.14

Issue
• We need to calculate area & circumference for:-

• Circle..

• Square..

• Rectangle..

Writing mathematical equations for computer

Visual basic intoduction

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