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Visual Basic 2010Introduction
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
Programming
Testing
Programming languages
Compiled languagesFast
Run time
Interpreted LanguagesSlow
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.
IntegratedFormed or united into a whole.تكامل
A process in which something passes by degrees to a different stage.
Darwin
Development
Environment
Integrated Development Environment
IDE
Events & Actions
Events are things that happen to an object.
Actions are things that an object does.
Written programs or procedures or rules and associated documentation stored in memory.
Beta Software.
Alpha Software.
Software Package.
Systems Software.
Computer Software.
Documentation.
Software
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‘.
Dialog Box
Toolbox
ToolboxCommon Controls
www.Google.com
www.Google.com
Combination Box
CheckBox
RadioButton
ListBox
Learn By Doing
Install VB 2010 ExpressStep BY Step
Add one button and one label
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
Rename button1
Label1.text = nothing “ ”
Let both buttons have the same size
Fix button2 just like button1
Double click on Button2
Menu BarSave Your Work
Menu BarSave Your Work
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
Decimal 12 bytes+/- 79,228,162,514,264,337,593,543,950,335 if no decimal is use +/- 7.9228162514264337593543950335 (28 decimal places).
Arithmetic Operations
Numerical Data
X= 13.5 Mod 12 then X = 1.5
Operator Mathematical Function
+ Addition
- Subtraction
^ Exponential
* Multiplication
/ Division
Mod Modulus (return the remainder from an integer division)
\ Integer Division (discards the decimal places)
Nonnumeric Data
Data Type Storage Range
String (fixed length) Length of string 1 to 65,400 characters
String (variable length) Length + 10 bytes0 to 2 billion characters
Date 8 bytesJanuary 1, 100 to December 31, 9999
Boolean 2 bytes True or False
Object 4 bytes Any embedded object
Variant numeric 16 bytesAny value as large as Double
Variant text Length+22 bytesSame as variable-length string
• 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 DataString 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 DataString 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
Nonnumeric DataString Manipulation
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
3. 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
