Tip: How to do For/Next with a variable Step

PB · **Joined:** Fri Apr 25, 2003 5:24 pm **Posts:** 7581

Code updated for 5.20+

I thought I posted this as a standalone tip before, but I can't find it now...
so here it is again. (I originally had it posted as part of this longer thread:
http://forums.purebasic.com/english/vie ... php?t=4930).

Code:

; Example of 'For a=1 To 40 Step b' in PureBasic,
; because you can't use variables for 'Step' yet.

b = 2            ;The 'Step' value (normally a constant!).
For a = 1 To 40
  Debug a        ;Do whatever processing on 'a' here.
  a + b - 1      ;This MUST go directly before 'Next'!
Next

scurrier · **Joined:** Sat May 03, 2003 4:10 am **Posts:** 169

this is out of the help

For : Next

Syntax

For <variable> = <expression1> To <expression2> [Step <constant>]
...
Next [<variable>]

or is this just for windows and not linux?

Sean

LarsG · **Posted:** Fri Mar 12, 2004 1:38 pm

I think that PB meant this as a way of having the Step value variable, instead of a constant..

scurrier · **Joined:** Sat May 03, 2003 4:10 am **Posts:** 169

i think i know what your talking about now
but you can do this

#stp=2
For x =1 To 100 Step #stp
Debug x
Next

LarsG · **Posted:** Fri Mar 12, 2004 2:12 pm

scurrier wrote:

i think i know what your talking about now
but you can do this

#stp=2
For x =1 To 100 Step #stp
Debug x
Next

Yes, but #stp=2 is still a constant...
I believe PB meant it like this..:
(just a pseudo example)

Code:

if a = 1
    b = 2
else
    b = 1
endif
for i = 1 to 100 ;"step b" won't work here...
    ; code here.. blah blah
    i + b - 1
next

TronDoc · **Posted:** Sat Mar 13, 2004 3:23 am

PB wrote:

so here it is again.

nice tip. thank you. --jb

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Tip: How to do For/Next with a variable Step

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