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► KB ► To/From Guides ► ObjectPAL ► Statements

Cross Ref > Statements

By Mike Prestwood

ObjectPAL versus VB Classic: A side by side comparison between ObjectPAL and VB Classic.

Statements

Common statements such as if statements, loops, etc.

Exception Trapping

[Other Languages]

Languages Focus

A common usage of exception handling is to obtain and use resources in a "try-it" block, deal with any exceptions in an "exceptions" block, and release the resources in some kind of "final" block which executes whether or not any exceptions are trapped.

ObjectPAL: try...onFail

ObjectPAL has a try...onFail statement but does not have a finally-type component. However, the code afer endTry will execute.

try

onFail

endTry

Syntax Example:

var
  i SmallInt
endVar

try
  i = 0
  i = 1/i
onFail
  msgInfo("", "You cannot divide by zero.")
endTry

Debugging ObjectPAL Code

[Not specified yet. Coming...]

If Statement

[Other Languages]

ObjectPAL: If..Else..EndIf, or switch

ObjectPAL supports a simple If...Else...EndIf statement.

Notice ObjectPAL does not support an ElseIf feature as part of an if statement. Instead use a switch statement

Syntax Example: 1 certification question.

'Does ObjectPAL evaluate the math correctly? No!

If (.1 + .1 + .1) = .3 Then
  msgInfo("", "Correct")
Else
  msgInfo("", "Not correct")
EndIf

'Switch statement example.
switch
  case x = "Nate": MsgInfo("", "Hi Nate")
  case x = "Felicia": MsgInfo("", "Hi Felly")

  otherwise: MsgInfo("", "Who are you?")

endSwitch

VB Classic: If..ElseIf..Else..End If

The End If is optional if you put your code on a single line.

Syntax Example:

//Single line example.

If X = True Then MsgBox "hello"

//Complete example.

If X = True Then
  MsgBox "hello"

ElseIf Y = "ABC" Then
  MsgBox "goodbye"
Else
  MsgBox "what?"
End If