This document discusses decision making and branching statements in programming. It explains that there are two types of decision making statements: branching statements like if/else statements and select case statements, and loop statements like for, do, and while loops. It provides examples of if/else and select case statements to conditionally execute different blocks of code based on various conditions being true. It also discusses some best practices for using these conditional statements.

1. Decision making
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2. It’s decide the flow of program
2 types
• Branching statements, Test Structure, Decision
Structure
• Loop statements
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3. Branching Statements
• If, Select case
Loop Statements
• For,Do,While
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4. If condition Then
Logic…
End if
If condition Then
Logic…
Else
Logic….
End if
If condition Then
Logic…
ElseIf condition-n Then
Logic..
Else
Logic…
End If
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5. If TotalMarks>150 then
Logic..
End if
If a=b then
Logic..
Else
Logic..
End if
If Marks>0 and Marks<50 then
Logic..
Else if Marks>=50 and Marks<100
then
Logic..
Else if Marks>=100 and Marks<150
then
Logic..
End if
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6. When it finds a True condition
Else statement block, which Visual
Basic.net executes if none of the conditions
are True.
You can have any number of ElseIf
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7.  You can use And / Or condition with it.
 Example:
If marks>50 and marks<100 then
statements
Else if marks>=100 and marks<150 then
statements
End if
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8. Leap Year
Odd,Even
Positive ,Negative
Maximum,Minimum number
Mark of students
• Between 0 - 50,50 –100 ,100-150
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9. Whereas the If and ElseIf statements
can evaluate a different expression in
each statement,
The Select statement evaluates a
single expression only once and uses
it for every comparison.
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10. Select Case testexpression
[Case expressionlist-n
[statements-n]] ...
[Case Else
[elsestatements]]
End Select
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11. Select Performance
Case 1 ' Performance is 1.
Return Salary * 0.1
Case 2, 3 ' Performance is 2 or 3.
Return Salary * 0.09
Case 5 To 7 ' Performance is 5, 6, or 7.
Return Salary * 0.07
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12. Case 4, 8 To 10 ‘Performance is 4, 8, 9, or 10.
Return Salary * 0.05
Case Is < 14 'Performance is 11, 12, 13.
Return 100
Case Else ' Performance is < 1 or > 14.
Return 0
End select
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13. Select Case JobPlace
Case “Ahmedabad”
logic…
Case “Mumbai”,”Delhi”,”Chennai”
logic..
Case Else
logic..
End select 13
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14. If multiple Case statements are True,
only the statements belonging to the
first true Case statement are
executed.
Case Else clause must be the last
Case clause.
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15. Use the To keyword to specify a
range of values.
The Is keyword is used to precede
any comparison operators.
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16. Enter Color name and according
to it textbox color will change
Enter student no according to no
display message “Good”,”Try best
in next exam”,”Need to improve”
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17. Any questions?
www.shyamsir.com
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