what equivalent to "continue" in C++

[choconlangthang]

Hello, I have a for...next loop, and wanna have a "continue" statement if some condition is matched, but I can't find it on MSDN, plz tip me, a newnewbie in VB, tks.

[humptydumpty]

Old Visual Basic does not have a Continue statement
But in case of VB.Net
The Continue Statement is the New Feature in VB.NET 2005 -

for more detils regarding .net just read following article
http://www.knowdotnet.com/articles/c...statement.html

[Shuja Ali]

There is no continue in VB.NET 2003. So you would have to manage this with an If statement. Something like this

Dim loopCounter As Long
        For loopCounter = 1 To 100
             'put your condition here
        Next

[Boumxyz2]

If you need a continue there's a problem with the structure of your loop and or program, cause I rarely have to use a continue statement and even then, I try to change my loop so I don't have to use it.

[wildfrog]

If you need a continue there's a problem with the structure of your loop and or program

Why's that?

cause I rarely have to use a continue statement and even then, I try to change my loop so I don't have to use it.

It try to picture some situations where I could replace the continue statement and all I see is a lot of nested if statements (or gotos). Are that any better?

- petter

[gigemboy]

Maybe it will be easier if you type out in pseudocode what you are trying to accomplish in your for...next loop... instead of everyone guessing

[choconlangthang]

Maybe it will be easier if you type out in pseudocode what you are trying to accomplish in your for...next loop... instead of everyone guessing

Indeed, it's not that big a problem, I just wonder whether there is anything equivalent to "continue" (matter of syntax) in VB.NET. I solved it with goto

for each i as integer = 0 to limit
if condition = true then
goto label1
end if

'do the rest here
'............................
'them comes the label
label1:
next i

[Alsvha]

If I understand you correct, you wish to skip a huge lump of code if your condition is met?

Then why not place all the code in your for-loop inside an if-condition with the negated condition, so it only runs when you want to, instead of skipping it when you don't want it to run?

Something along the line:

for each i as integer = 0 to limit
if not condition = true then
'do the rest here
end if
next i

Alternative you could fragment your code into several methods (functions/subs) and do the various parts when ever you want it to determined by if-conditions.

[jhammer]

Never use goto. I repeat: never use goto. I repeat again: never use goto. If that's not enough I can repeat it as many times you want.

how about doing:

for each i as integer = 0 to limit
   if not condition then 
        i=limit +1
   else
        'do the rest here
   end if
next i

Or:

dim i as integer=0
while condition and i<limit
     'do the rest here
     i += 1
end while

I'm sure you can do this in at least 10 other ways (and not using goto)

[choconlangthang]

I know there are so many complaints about "goto" but sometimes it is still needed to make code become intuitive. Any better solution for this

        For i As Integer = 0 To limit
            If conditionA Then
                job1()
                If conditionB Then
                    job2()
                    If conditionC Then
                        job3()
                        GoTo label1
                    End If
                    job22()
                End If
                job11()
            End If
            job0()
label1:
        Next i

[jhammer]

First, the code is not very well-designed. It is not very readable, very hard to maintain, and it is not open for extensions. It is just not very object-oriented. This kind of code is very C-stylish. It is plainfully old fashioned. I would strongly advice to redesign the whole lot.

Second, do you really want to get into the old discussion of goto? Is it not a common knowledge that goto breaks the flow of the code? If you want to debug can you easily tell how did you get to the label? I programmed with VB 6 , and I remember the happy days of On Error Goto statements. I sure as hell don't want to get back to those days. Lets not waste time on goto. I strongly advise against it. I say naver use it. If you know what's good for you - stay away from goto. But hey, be my guest.

Third:

 For i As Integer = 0 To limit
            dim flag as boolean = true
            If conditionA Then
                job1()
                If conditionB Then
                    job2()
                    If conditionC Then
                        job3()
                        flag = false
                    End If
                    if flag then job22()
                End If
               if flag then  job11()
            End If
            if flag then job0()
        Next i

The code is still very ugly (but it was ugly in the first place!!!). At least we don't have this goto in the code (thank god for that).

[sotoasty]

I know there are so many complaints about "goto" but sometimes it is still needed to make code become intuitive. Any better solution for this

        For i As Integer = 0 To limit
            If conditionA Then
                job1()
                If conditionB Then
                    job2()
                    If conditionC Then
                        job3()
                        GoTo label1
                    End If
                    job22()
                End If
                job11()
            End If
            job0()
label1:
        Next i

Personally, since you have all the subroutines anyway, why not make a few boolean functions.

    Private Sub DoIt()
        Dim Limit As Integer
        Dim ConditionA As Boolean
        Dim ConditionB As Boolean
        Dim ConditionC As Boolean
        For i As Integer = 0 To Limit
            Job0(ConditionA, ConditionB, ConditionC)
        Next i

    End Sub
    Private Sub Job0(ByVal conditiona, ByVal conditionb, ByVal conditionc)
        If conditiona Then
            If Job1(conditionb, conditionc) Then
                Exit Sub
            Else
                Job11()
            End If
        End If
        ' do job0 stuff
    End Sub
    Private Sub Job11()
        ' do job11 stuff
    End Sub
    Private Function Job1(ByVal conditionb, ByVal conditionc) As Boolean
        If conditionb Then
            Return Job2(conditionc)
        End If
        Job11()
    End Function
    Private Function Job2(ByVal conditionc) As Boolean
        If conditionc Then
            Job3()
            Return True
        End If
        Job22()
    End Function
    Private Sub Job22()
        ' do stuff for job22
    End Sub
    Private Sub Job3()
        'do job3 stuff
    End Sub

NOTE: I just wrote this, I didn't try it but I think it would work.

[aniskhan]

u can introduce a flag that change when the third check is true

If conditionC Then
      job3()
      flag=false

enclose the function that shd not run

if flag then  
       job22()
end if

[Boumxyz2]

OMG this is more complicated to read

        For i As Integer = 0 To limit
            If conditionA Then
                job1()
                If conditionB Then
                    job2()
                    If conditionC Then
                        job3()
                        GoTo label1
                    End If
                    job22()
                End If
                job11()
            End If
            job0()
label1:
        Next i

than

For i As Integer = 0 To limit
    if conditionA and Conditionb and ConditionC then
	job1()
	job2()
	job3()
    elseif conditionA and ConditionB and not ConditionC then
	job1()
	job2()
	job22()
	job11()
                job0()
    elseif conditionA and not conditionB and not conditionC then
	job1()
	job11()
                job0()
    elseif not conditionA then
               job0()
    endif
next i

[sotoasty]

It's interesting to see all the different coding solutions.

choconlangthang,

Yes you are allowed to use GOTO but most programmers avoid them at all costs. There should always be a way around using a goto. Please try to find the that way.