1. Control Structures in VB
Dr. John Abraham
Professor, UTPA

2. Sequential vs Selection
Program Counter
Transfer of control
Goto unstructured
Structured: sequence, selection and repetiton

3. Selection If..then If grade >= 60 then write(“Passed”) else
write (“Failed”)
End If

4. Nested selection If grade >= 90 then write(“A”) Else
write(“B”)
if grade >= 70 then
write(“C”)
write(“F”)
End If

5. Alternative version If grade >=90 then write (“A”)
ElseIf grade >=80 then
write(“B”)
ElseIf grade >= 70 then
write(“C”)
Else
write(“D”)
End If

6. Select Case Select Case Grade Case 100 statements Case 90 to 99
Case Else
End Select

7. Repetition chapters 5 & 6 While – End While Do While – Loop
Do Until – Loop
For – Next
Do – Loop While
Do – Loop Until
See example programs

8. While – End While Select a loop control variable (example grade)
Initialize that variable (either read or assign)
Set up loop like this
While grade <= 100
Grade = console.readline()
End while

9. Assignment3 Explained