RosettaCodeData/Task/Sort-an-integer-array/REXX/sort-an-integer-array-2.rexx

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2.2 KiB
Rexx

/*REXX program sorts (using E─sort) and displays a list of some interesting integers. */
Bell= 1 1 2 5 15 52 203 877 4140 21147 115975 /*a few Bell " */
Bern= '1 -1 1 0 -1 0 1 0 -1 0 5 0 -691 0 7 0 -3617' /*" " Bernoulli " */
Perrin= 3 0 2 3 2 5 5 7 10 12 17 22 29 39 51 68 90 /*" " Perrin " */
list= Bell Bern Perrin /*throw them all ───► a pot. */
say 'unsorted =' list /*display what's being shown.*/
#= words(list) /*nice to have # of elements.*/
do j=1 for # /*build an array, a single */
@.j=word(list, j) /* ··· element at a time.*/
end /*j*/
call eSort # /*sort the collection of #s. */
$=; do k=1 for #; $= $ @.k /*build a list from the array*/
end /*k*/
say ' sorted =' space($) /*display the sorted list. */
exit /*stick a fork in it, we're all done.*/
/*──────────────────────────────────────────────────────────────────────────────────────*/
eSort: procedure expose @.; parse arg N; h= N /*an eXchange sort.*/
do while h>1; h= h % 2 /*define a segment.*/
do i=1 for N-h; j= i; k= h + i /*sort top segment.*/
do while @.k<@.j /*see if need swap.*/
parse value @.j @.k with @.k @.j /*swap two elements*/
if h>=j then leave; j= j - h; k= k - h /*this part sorted?*/
end /*while @.k<@.j*/
end /*i*/
end /*while h>1*/
return