How do I do a loop in Visual Basic

Question

I have programmed in C, Pascal, GWBasic, TCL, Perl, Lisp, but Visual Basic is too advanced for me.

FOR j = 1 TO 31
  output_to_webpage "<p>Counter is " + j + "</p>"

  myDay = "" + j
  IF j < 10 THEN myDay = "0" + j

  MyStr = MyStr + ",j"
NEXT

The loop never appears to happen. Although if I comment out any references to the loop variable, j, it appears to loop.

How can I actually make Visual Basic loop. Or error. Not silently pretend there's no FOR loop there at all?

update: if the first statement of the loop was just a simple debugging statement I would expect it ALWAYS to be executed at least once, even if the rest of the loop was aborted. However, as pointed out below, the use of arithmetic on the loop variable somehow causes the entire loop not to be executed even once. Not even an initial debugging statement inside the loop. Very very strange I would think.

Answer 1

Have you tried NEXT j ?

Answer 2

I think it's because you're adding strings using arithmic addition instead of string addition.

Code should be (from top of head):

FOR j = 1 TO 31
  output_to_webpage "<p>Counter is " & j & "</p>"

  myDay = "" & j
  IF j < 10 THEN myDay = "0" & j

  MyStr = MyStr & ",j"
NEXT

Answer 3

It's more likely that the stuff inside the loop is broken. This works in a VB.NET console application:

For n = 1 To 31
    Console.WriteLine(n)
Next

So I doubt if For loops would be much different in previous versions of VB.

Try writing the body of your loop, substituting 1 for the loop variable, and see what it does.

Answer 4

Is j declared ?

Dim j as Integer

then add

Next j