Today, no business topic but it’s play time A couple of days ago, I stumbled upon the free book “10 PRINT CHR$(205.5+RND(1)); : GOTO 10“. No joke, that’s the title of the book. It’s about an one-line Commodore 64 BASIC program that prints a maze to the screen. Because I’m a big fan of Retrocomputing, I browsed the book a little bit.
Afterwards I asked myself what ABAP report I could write in one line of 40 characters with a nice output. The answer was sobering: Nothing interesting. Even with 80 characters I just printed vertical lines to the screen Here is my approach.
REPORT z.DO 10 TIMES.DO 80 TIMES.WRITE AT sy-index(1) '|'.ENDDO.NEW-LINE.ENDDO.
Finally I decided to give up the length restriction and wrote my own random maze generator as a homage to the original BASIC program. It uses the WRITE instruction and the characters “-” and “|” to build frames. You will find it on GitHub, too.
REPORT z_random_maze. DATA: lr_random_int TYPE REF TO cl_abap_random_int, lv_random_int TYPE i, lv_position_x TYPE i, lv_position_y TYPE i, lv_maze_part TYPE char2. lr_random_int = cl_abap_random_int=>create( seed = CONV i( sy-uzeit ) min = 1 max = 9 ). DO 20 TIMES. lv_position_y = sy-index. lv_position_x = 1. DO 30 TIMES. CLEAR lv_maze_part. IF lv_position_y = 20. lv_maze_part = '--'. ELSE. lv_random_int = lr_random_int->get_next( ). IF lv_random_int 7. lv_maze_part = '--'. ENDIF. ENDIF. WRITE AT lv_position_x(2) lv_maze_part. lv_position_x = lv_position_x + 2. ENDDO. NEW-LINE. ENDDO.
Relax your eyes, try to find your way through the maze and have fun Here is a little example of the report output. And if you have a good idea for an interesting one-liner in ABAP, let me know.