SuperBASIC

2024-03-15T15:11:15Z

172.59.97.98: /* Ernestos' tips on if, then, else: */ Added a hint about parsing error messages

SuperBASIC is inspired by BBC BASIC but offers quite a bit more.
* [https://github.com/FoenixRetro/f256-superbasic/blob/main/reference/source/f256jr_basic_ref.pdf SuperBASIC Reference Manual].
* [[SuperBASIC Memory Map]]
* Watch EMWhite's excellent intro series on YouTube: [https://www.youtube.com/playlist?list=PLeHjTvk7NPiSqGz4REMH-S4hjYpLS2YNR Full Playlist].

=== An informal list of tips, "gotchas": ===

===== IF, THEN, ELSE =====

====== Source of this tip: Ernesto ======
* A regular <code>if then</code> condition can't contain an <code>else</code> statement, as in this example:
<code>10 if a=0 then x=10</code>
* If you need to do an <code>if then else</code> structure, you actually have to do an <code>if else endif</code> structure like in the following example, skipping the <code>then</code> statement.
<code>10 if a=0 
20 x=1 
30 else 
40 x=2 
50 endif</code>
* If you do it in one line it needs to have some colons added, making it look weird like this:
<code>10 if a=0:x=1:else:x=2:endif</code>
* if you dare to omit the <code>endif</code> thinking that the <code>if</code> statement won't need it, (mmm.., everything is in one line, so no need, right?) -Nope...all hell breaks loose!-
<code>10 if a=0:x=1:else:x=2: REM "<-- Error, omited the endif"</code>
* be careful not to add an extra <code>then</code> statement by mistake to an <code>if else endif</code> structure, if you do -All hell breaks loose again!!-
<code>10 if a=0 then : rem "<-- Error, THEN is not needed!!!" 
20 x=1 
30 else 
40 x=2 
50 endif</code>

''Debugging hint: If you encounter an error like "open structure" or "endproc without a proc": do not trust the line number that you are given. The root of the problem is probably in a structure earlier on in the code.''

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