Re: BSEARCH and QSORT

Thanks Hans, very good example!  Just what I was looking
for!!!

On Thu, 25 Jul 2002 10:41:08 -0400
  Hans Boldt <boldt@ca.ibm.com> wrote:
>JJW wrote:
>>Hi *ALL
>>
>>Does anyone have small working examples of BSEARCH and
>>QSORT they can send me?
>
>Sure:
>-------------------------------------------------------------------------
>      H dftactgrp(*no) bnddir('QC2LE')
>
>      D qsort           pr
>                 extproc('qsort')
>      D   base                          *   value
>      D   num                         10i 0 value
>      D   width                       10i 0 value
>      D   compare                       *   procptr value
>
>      D bsearch         pr              *
>  extproc('bsearch')
>      D   key                           *   value
>      D   base                          *   value
>      D   num                         10i 0 value
>      D   size                        10i 0 value
>      D   compare                       *   procptr value
>
>      D compare5a       pr            10i 0
>      D   element1                     5a   const
>      D   element2                     5a   const
>
>      D array           s              5a   dim(10)
>ctdata perrcd(10)
>      D i               s             10i 0
>      D elem            s                   like(array)
>based(p)
>      D key             s                   like(array)
>
>       /free
>          // sort the array and show results
>          qsort (%addr(array): %elem(array):
>%size(array):
>                 %paddr(compare5a));
>          for i = 1 to %elem(array);
>             dsply array(i);
>          endfor;
>
>          // Search for something in the array
>          key = 'hhhhh';
>          p = bsearch (%addr(key): %addr(array):
>%elem(array):
>                       %size(array): %paddr(compare5a));
>          dsply elem;
>
>          // Compute index of item in the array
>          i = %div(p - %addr(array):%size(array)) + 1;
>          dsply i;
>
>          *inlr = *on;
>
>       /end-free
>
>      P compare5a       b
>      D compare5a       pi            10i 0
>      D   element1                     5a   const
>      D   element2                     5a   const
>       /free
>          if element1 < element2;
>             return -1;
>          elseif element1 > element2;
>             return 1;
>          endif;
>          return 0;
>       /end-free
>      P compare5a       e
>
>**CTDATA array
>dddddhhhhhooooouuuuutttttmmmmmwwwwwlllllqqqqqppppp
>-------------------------------------------------------------------------
>
>Oh yeah, be sure to check if bsearch() returns a NULL
>value, which
>means the item was not found.
>
>Cheers!  Hans
>
>
>
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