[plt-scheme] (newbie question) About Loop

On Fri, Jun 12, 2009 at 2:47 AM, MD.MAHBUBUR RASHEED<mmrasheed at gmail.com> wrote:
> Hi,
> How can I implement loop in  plt-scheme like in java-
>
> for(int i=0;i<10;){
>      for(int j=0;j<3;){
>           System.out.println(""+j);
>           j++;
>      }
>       System.out.println(""+i);
>       i++;
> }

straightforward, standard and with no intermediary list building:

(do ((i 0 (+ 1 i)))
    ((>= i 10))
    (do ((j 0 (+ 1 j)))
      ((>= j 3))
      (display j)(newline))
    (display i)(newline))

do construct is:
(do (inits ...)
   (stop? optional-final-exp)
  optional-expressions ...)

where one init is (var initial-value update-expression)

as in RNRS...