1. Working with
Comparison
Operators
Jesselle Capa
Charles Justine Bool

2. Comparison Operators
Operators that compare data values
to produce true or false results.
ASCII
Contains a list of characters with
corresponding unique numeric
representation

3. Comparison Operators
Operator Usage Description
> lblSales.Caption > The greater than operator return True Only
Goal if the value on the right.
< Pay < 2000.0 The less than operator return True if the
value on the left of < is less than the value
on the right.
= Age = Limit The equal to operator return True if the
value on the both sides of = are equal.
>= FirstName >= The greater than or equal to operator
“Mike” return True if the value on the left of >= is
greater than or equal to the value on the
right.
<= Num <= The less than or equal to operator return
lblAmt.Caption True if the value on the left of <= is less
than or equal to the value on the right.
<> txtAns.text<> The not equal to operator return True if the
“Yes” value on the left of <> is unequal to the
value on the right.

4. Relationship Results
Relation Result
2>1 True
3<3 False
5 > 10 True
“Apple” <= “Orange” True
“Macdonald “ < “Mc Donald” True
0 >=0 True
0 <=0 True
1 <>2 True
2 >=3 False

5. Working with If Statement
 The If statement provides logic for the
application, w/c analyzes data and makes
decisions based on the analysis.
 The If statement uses comparison operators
to test data values and performs one of two
possible actions based on the results of the
comparison‟s test.
 Without the If statement, the application
code will sequentially execute . Meaning , one
statement is executed after another.

6. The If statement is usually
written in the following
format:
If comparisonTest Then
One or more statements
End If

7. If Statement and Comparison
 Keep in mind that the body of the If
statement executes based on the results of
the comparison test. The statement executes
if the results is true. Otherwise , the rest of
the application executes as usual and the If
statement will be skipped.
 Data that are entered into a text box control
is treated as a Variant data type . When
arithmetic is performed with a Variant with
data type that holds a numeric value . Visual
Basic will convert such data to a number for
the calculation purposes.

8. The If statement's Else Branching
 The If statement with Else is usually written in
the following format:
If comparisontest Then
one or more statements
Else
one or more statements
End If

9. Compound Comparison with the
Logical Operators
Operator Usage Description
And If (A > B) And (C < Returns True if both sides
D) of the And are true.
Or If (A > B) Or (C < Returns True if either side
D) of the Or is true.
Not If Not (strAns = Returns the opposite true
“Yes”) or false result.

10. Example :
Private Sub cmdGetStudentGrade_Click()
„Code for Generating Student's Grade
„Declare Variables
Dim percent As Integer, studentmark As String
„Clear text Box
txtGrade.Text = ""
„Get Students Mark from inputbox
percent = InputBox("Enter Students
Percent")

11. 'Begin if statement
If percent >= 50 And percent < 60 Then
studentmark = "C"
Else percent >= 60 And percent < 70 Then
studentmark = "B"
Else percent >= 70 Then
studentmark = "A"
Else
studentmark = "FAIL"
End If
'Display Output
txtGrade.Text = studentmark
End Sub

15. Nesting If-Else Statements
If (intAge = 5) Then
lblTitle.Caption = “Kindergarten”
Else
If (intAge = 6) Then
lblTitle.Caption = “1st Grade”
Else
If (intAge = 7) Then
lblTitle.Caption = “2nd Grade”

16. If (intAge = 8) Then
lblTitle.Caption = “3rd Grade”
Else
If (intAge = 9) Then
lblTitle.Caption = “4th Grade”
Else
If (intAge = 10) Then
lblTitle.Caption = “5th Grade”
Else
If (intAge = 11) Then
lblTitle.Caption = “6th Grade”
Else

17. lblTitle.Caption = "Advanced"
End If
End If
End If
End If
End If
End If
End If

18. Using Select Case Statement
 The Select Case Statement handles multiple –
choice conditions better than If-Else . When
several choices are possible , programmers
usually use Select Case as a substitute for
long , nested If-Else , but you may find out
that it is easier to code and to maintain .
However , you must avoid using the Select
Case if you will have a simple If or If-
Else for the code , unless you need to
compare against more than two values .
Otherwise , stick with the simple If and If-
Else statements

19. Select Case intAge
Case 5 : lblTitle.Caption = "Kindergarten"
Case 6 : lblTitle.Caption = "1st Grade"
Case 7 : lblTitle.Caption = "2nd Grade"
Case 8 : lblTitle.Caption = "3rd Grade"
Case 9 : lblTitle.Caption = "4th Grade"
Case 10 : lblTitle.Caption = "5th Grade
Case 11 : lblTitle.Caption = "6th Grade
Case Else : lblTitle.Caption = "Advanced"
End Select

20. 3 Select Case Optional Formats:
Select Case Expressions
Case Is Relation :
One or more Statements
Case Is Relation :
One or more Statements
[Case Is Relation :
One or more Statements]
[Case Is Relation :
One or more Statements]
End Else

21. Select Case Expressions
Case Value
One or more Visual Basic Statements
Case Value
One or more Visual Basic Statements
[Case Value
One or more Visual Basic Statements]
[Case Value
One or more Visual Basic Statements]
End Else

22. Select Case Expressions
Case expr1 To expr2 :
One or more Visual Basic Statements
Case expr1 To expr2 :
One or more Visual Basic Statements
[Case expr1 To expr2 :
One or more Visual Basic Statements]
[Case Else :
One or more Visual Basic Statements]
End Else