Scratch

ScratchReallyROCKS wrote:

I'm working on (trying) to make BASIC (Beginner's All-purpose Symbolic Instruction Code) in Scratch... I need to know what it originally looked like (mostly the syntax), and how it worked and what its limits were.

Well, you've come to the right place.      You can read my BASIC compiler in Logo for a discussion of the language capabilities and limits, with simple examples of BASIC programs.

ScratchReallyROCKS wrote:

Now honestly, do you think this is possible to make in BYOB?

The hardest part will be getting the BASIC program text into a form you can use in the BYOB program.  Is it going to be interactive?  You'll have to write a little text editor.  Luckily, because of the line numbers, you only have to edit one line at a time; you can keep a list of line numbers just like my Logo version.

Other than that, in some ways it'll be easier because you have first class procedures in BYOB, whereas in Logo I had to manipulate the text of the program as a list structure.  But that means you certainly can't just do it exactly the way I did.  You'll have blocks with names like BASIC-PRINT and BASIC-FOR and so on, each of which implements a BASIC command.

Oh, and I totally cheated by letting Logo parse arithmetic expressions.  Since arithmetic operations in BYOB are blocks rather than text strings, you'll have to turn the text "a+b" into a call to the + block, etc.

But, yeah, it's doable, I think.

Does anyone have any pictures of what it looked like (this time I'm not talking about the syntax because I already know what that looks like.)

Here:


And a bit or orignial code:
10 INPUT "What is your name: ", U$
20 PRINT "Hello "; U$
30 INPUT "How many stars do you want: ", N
40 S$ = ""
50 FOR I = 1 TO N
60 S$ = S$ + "*"
70 NEXT I
80 PRINT S$
90 INPUT "Do you want more stars? ", A$
100 IF LEN(A$) = 0 THEN GOTO 90
110 A$ = LEFT$(A$, 1)
120 IF A$ = "Y" OR A$ = "y" THEN GOTO 30
130 PRINT "Goodbye "; U$
140 END

Last edited by johnnydean1 (2010-06-06 16:11:19)

ScratchReallyROCKS wrote:

johnnydean1 wrote:

Here:
http://upload.wikimedia.org/wikipedia/c … xample.png

And a bit or orignial code:
10 INPUT "What is your name: ", U$
20 PRINT "Hello "; U$
30 INPUT "How many stars do you want: ", N
40 S$ = ""
50 FOR I = 1 TO N
60 S$ = S$ + "*"
70 NEXT I
80 PRINT S$
90 INPUT "Do you want more stars? ", A$
100 IF LEN(A$) = 0 THEN GOTO 90
110 A$ = LEFT$(A$, 1)
120 IF A$ = "Y" OR A$ = "y" THEN GOTO 30
130 PRINT "Goodbye "; U$
140 END

Thanks!

That looks like either commodore or an atari...

ScratchReallyROCKS wrote:

Now that I think of it, I think I'll make BASIC in Panther because of it's file I/O blocks, that way you could have a master file that everything was saved to, like a hard drive.

EDIT: Maybe, just for added pointlessness, that file will be encoded in binary. Please don't ask why. 

'd work on getting it working before encoding the output file 

ScratchReallyROCKS wrote:

cds56 wrote:

ScratchReallyROCKS wrote:

Now that I think of it, I think I'll make BASIC in Panther because of it's file I/O blocks, that way you could have a master file that everything was saved to, like a hard drive.

EDIT: Maybe, just for added pointlessness, that file will be encoded in binary. Please don't ask why. 

'd work on getting it working before encoding the output file 

Yeah I don't think I will encode it anyway.    (pass on the smiley!)

Okay! :D
What?

This should be really interesting! I look forward to seeing the final product 

johnnydean1 wrote:

If you need help tell me and Ill have a go  .


(Tell me on a comment on 1 of my porjects)

Okay!