Visual Basic is an event-driven programming language first released by Microsoft in 1991. It is used for beginners and has all-purpose symbolic instruction code. The language uses events, objects, variables, constants, methods, arithmetic operations, comparisons, and data types like integers, strings, Booleans, and dates. Key concepts include events that trigger code execution, objects that combine code and data, and methods like val() and str() that convert between numeric and string data.

1. GRADE 9 COMSCIE
CISAT

2. VISUAL BASIC
• Is a third generation event-driven programming language first
released by Microsoft in 1991
• B – eginners
• A – ll purpose
• S - ymbolic
• I – nstruction
• C - ode

3. •Event – is an action recognized by control or form.
•Event driven Application – executeVisual Basic program in
response to an event.
•Object – is a simply a combination of program and data
that can be treated as a Unit form or a Button is an object.
•Variables – are memory location (address) within the
program module.
•Constants – Look like a variable, however unlike the
variable the value or data it holds remain fixed (while
application system is running or executing.)

4. The Legend of Val() and Str() Methods
• Value method ( val() ) and String Method ( str() )
• The val() Method converts the displayed data into numeric
• The str() method convert displayed data into string Data.

5. Visual Basic Arithmetic Operation
ADDITION (+) SUBTRACTION (-)
MULTIPLICATION (*) DIVISION (/)
INTEGER DIVISION () EXPONENTIATION (^)
MODULUS OPERATION (%)

6. Visual Basic Comparison & String Concatenation
Operator
• Is – if two object references refers to same object
• Like – perform string pattern matching
• & and + string concatenation

7. BASIC DATA TYPES OF VISUAL BASIC
DATATYPE PURPOSE
Integer
An integer data type is a whole number.This values could
be positive or negative and traditionally holds values in
the range of : -32,768 to 32,727
Ex: 9 143 3200
Long
A bigger integer means a wider range of integer
Ex: 100,123 1,000,000 33,200
Single
A number with fractional part or decimal point and holds
values up to 3402823E+38 or 34 to the 38th power
Ex: 3.1416 2.54 193.20
Double
A number w/ fractional part or decimal point holds up to
1.7976931348623D+ 308 or 18 times to the 308th power
Ex: 1143441000.5121 1000000000.151314

8. DATATYPE PURPOSE
String
A sequence of one or more character that are enclosed
within double quotation marks.
Ex : “A” “Hello” “World”
“HelloWorld”
Boolean
A data type that holds true or false values
Ex: if 13>10 then
answer = yes
end if
Byte
A small integer data type with a range of 0 to 255
Ex: 6 254 100 120 199
Date
For Date values data type
Ex: Birthdate = #Sept – 12- 82 #
Birthdate = #Mar – 7- 1982 #
Birthdate = #17 October 1997 #