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Re: endless loops suck [message #33827 is a reply to message #33823]

Sun, 02 February 2003 19:18

Thomas Gutzler
Messages: 44
Registered: November 2002

Member

good morning,

David Fanning wrote:
>
> So I admit, "infinite" WHILE loops *can* be interrupted, as long as
> they use BEGIN ... END statement blocks. Try this:
>
> PRO Test
> While 1 DO BEGIN
> Print, 'Test before you Post!'
> ENDWHILE
> END

I thought about this and figured out that I have a loop with begin
and end. It looks like that:

PRO SnakeInterp,xi,yi,dmax,dmin
; x,y are arrays of coordinates
; dmin, dmax are preferred min and max distance between coordinates
[...]
; WHILE (MAX(d) GT dmax) DO BEGIN ; this would be correct
WHILE (1) DO BEGIN ; this obviously loops to dead
idx0 = (d GT dmax)
=> z = SnakeIndex(idx0) ; debugger is here
p = INDGEN(N+1)+1
xi = InterPol([xi,xi[0]],p,z)
yi = InterPol([yi,yi[0]],p,z)
N = N_ELEMENTS(xi)
d = abs( [xi[1:N-1],xi[0]] - xi) + abs( [yi[1:N-1],yi[0]] - yi)
ENDWHILE
END

FUNCTION snakeindex, idx
; SNAKEINDEX Create index for adpative interpolating the snake
arr = idx
N = N_ELEMENTS(xi)
arr = (TRANSPOSE([[arr],[INTARR(N)+1]]))[0:2*N-2]
y = DOUBLE(WHERE([1,arr] EQ 1))/2+1
RETURN, y
END

I pressed "Step out", then CTRL+BREAK (10 times) then CTRL+c (another 10
times) then I made myself a tea and read some news. After half an hour
taskmanager was my friend again :(
I thought maybe the compiler needs a little bit of time to finish
currently running processes before it polls the keyboard again and breaks.

> On my Windows machine I can interrupt this program (after I've
> learned my lesson) by doing a CNTL-Break.

I could interrupt the Print, 'Test before you Post!' loop with this, yes.

Perhaps I just should pay more attention to my sourcecode.

Tom

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[Message index]

		Re: endless loops suck By: Thomas Gutzler on Mon, 03 February 2003 17:57
		Re: endless loops suck By: Pete[2] on Mon, 03 February 2003 15:36
		Re: endless loops suck By: Thomas Gutzler on Sun, 02 February 2003 19:18
		Re: endless loops suck By: David Fanning on Sat, 01 February 2003 08:14
		Re: endless loops suck By: David Fanning on Fri, 31 January 2003 11:38
		Re: endless loops suck By: Pavel A. Romashkin on Fri, 31 January 2003 11:11
		Re: endless loops suck By: Timm Weitkamp on Fri, 31 January 2003 05:02
		Re: endless loops suck By: thompson on Tue, 04 February 2003 09:11
		Re: endless loops suck By: thompson on Tue, 04 February 2003 09:13
		Re: endless loops suck By: Timm Weitkamp on Tue, 04 February 2003 01:14

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