Sharp MZ-800 - Page 29

(4) Adding a line
A new line can be added to any portion of the program. For instance, if we want to insert a line be-
tween line 10 and line 20, move the cursor to the beginning of the new line below line 40. Type ‘15
REM Editing sample |CR|’’.
10 CLS
20 PRINT ‘‘SAMPLE PROGRAM”
30 PRINT ‘‘MZ-800”
40 END
15 REM Editing sample
You may have noticed that until we added line 15, all the line numbers have been in increments of
10. There is no real technical reason for doing this other than the fact that increments of 10 leave space
for extra lines to be inserted if you want to change the program later on, and increments of 10 are
easy to remember. With this in mind, line number 15 could have just as easily been any other number
between 11 and 19 inclusive, but ‘‘15’’ is convenient since it still allows even further lines to be added
if later program changes are made.
Enter the CLS command, then enter the LIST command to confirm that the new line is now inserted
between lines 10 and 20.
LIST
10 CLS
15 REM Editing sample
20 PRINT ‘‘SAMPLE PROGRAM”
30 PRINT ‘’MZ-800"
40 END
(5) Deleting lines
Any program line can be deleted by using the DELETE command. To delete lines 15 and 20, type:
DELETE 15-20[CR]
Enter the LIST command. The program listing should appear as follows:
10 CLS
30 PRINT ‘‘MZ-800’"
40 END
Typing a line number and pressing the key also deletes the line.
(6) Renumbering
Enter the RENUM command to return all the line numbers to increments of 10. (RENUM can also
be specified to increment the line numbers by any other value.)
RENUM
LIST
10 CLS
20 PRINT ‘‘MZ-800""
30 END