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Thursday, 22 December 2011 23:58 |
Select Case control structure is slightly different from the If....ElseIf control structure . The difference is that the Select Case control structure basically only make decision on one expression or dimension (for example the examination grade) while the If ...ElseIf statement control structure may evaluate only one expression, each If....ElseIf statement may also compute entirely different dimensions. Select Case is preferred when there exist many different conditions because using If...Then..ElseIf statements might become too messy.
The format of the Select Case control structure is show below:
Select Case expression
Case value1
Block of one or more VB statements
Case value2
Block of one or more VB Statements
Case value3
.
Case Else
Block of one or more VB Statements
End Select
Example 1
Select Case grade
Case "A"
result.Caption="High Distinction"
Case "A-"
result.Caption="Distinction"
Case "B"
result.Caption="Credit"
Case "C"
result.Caption="Pass"
Case Else
result.Caption="Fail"
End Select
Example 2
Select Case mark
Case Is >= 85
comment.Caption = "Excellence"
Case Is >= 70
comment.Caption = "Good"
Case Is >= 60
comment.Caption = "Above Average"
Case Is >= 50
comment.Caption = "Average"
Case Else
comment.Caption = "Need to work harder"
End Select
Example 3
Select Case mark
Case 0 to 49
comment.Caption = "Need to work harder"
Case 50 to 59
comment.Caption = "Average"
Case 60 to 69
comment.Caption = "Above Average"
Case 70 to 84
comment.Caption = "Good"
Case Else
comment.Caption = "Excellence"
End Select
 Read more: |
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Monday, 29 August 2011 12:24 |
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Installing PowerDNS (With MySQL Backend) And Poweradmin On Debian Squeeze
This article shows how you can install the PowerDNS nameserver (with MySQL backend) and the Poweradmin
control panel for PowerDNS on a Debian Squeeze system. PowerDNS is a
high-performance, authoritative-only nameserver - in the setup described
here it will read the DNS records from a MySQL database (similar to
MyDNS), although other backends such as PostgreSQL are supported as
well. Poweradmin is a web-based control panel for PowerDNS. Read more: |
