Initial data commit

Task/Loops-Nested/REXX/loops-nested.rexx

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+/*REXX program loops through a two-dimensional array to search for a  '20'    (twenty). */
+parse arg rows cols targ .                       /*obtain optional arguments from the CL*/
+if rows=='' | rows==","  then rows=60            /*Rows not specified?  Then use default*/
+if cols=='' | cols==","  then cols=10            /*Cols  "      "         "   "     "   */
+if targ=='' | targ==","  then targ=20            /*Targ  "      "         "   "     "   */
+w=max(length(rows), length(cols), length(targ))  /*W:  used for formatting the output.  */
+not= 'not'                                       /* [↓]  construct the 2─dimension array*/
+          do     row=1  for rows                 /*ROW  is the 1st dimension of array.  */
+              do col=1  for cols                 /*COL   "  "  2nd     "      "   "     */
+              @.row.col=random(1, targ)          /*create some positive random integers.*/
+              end   /*row*/
+          end       /*col*/
+
+          do     r=1  for rows    /* ◄───────────────── now, search for the target {20}.*/
+              do c=1  for cols
+              say left('@.'r"."c, 3+w+w) '=' right(@.r.c, w)    /*show an array element.*/
+              if @.r.c==targ  then do; not=; leave r; end       /*found the targ number?*/
+              end   /*c*/
+          end       /*r*/
+
+say right( space( 'Target'  not  "found:" )    targ, 33, '─')
+                                                 /*stick a fork in it,  we're all done. */