Talk:BASIC token

Does anyone know how the "invisible LET" was stored? I see that the LET is token $88, but is the same token used for:

   100 LET A=10

vs:

   100 A=10

Maury Markowitz (talk) 16:51, 7 December 2020 (CET)

In BASIC V.2 is LET A=10 the same like A=10 (short form). Normally you use not the LET command in CBM BASIC V.2. You use only the short form!

I think the BASIC interpreter used the same token for a variable declaration with LET and without LET.--Jodigi (talk) 19:10, 7 December 2020 (CET)

But then how does LIST work? Does it simply remove any LET that you typed in, sort of how ? turns into PRINT? Maury Markowitz (talk) 20:46, 7 December 2020 (CET)

No, I tried that, typing a LET does come out in the LIST. Maury Markowitz (talk) 22:23, 7 December 2020 (CET)

There is no token at all if LET is omitted. The interpreter asumes the if a statement does not start with a token, it could only be a LET (without the token ;) ). So the parsing continues at the state as an imaginary LET would has been read. Therefore LIST only shows what is actually there. --JohannKlasek (talk) 14:21, 8 December 2020 (CET)

Ah, thanks Johann. Maury Markowitz (talk) 18:03, 6 December 2021 (CET)

Assignment vs. "is-equal"?

I see that token $B2 is "= (equals operator)". Is this token also used in assignments, like "A=10"? Or is the = in that case left in ASCII format? Maury Markowitz (talk) 18:03, 6 December 2021 (CET)

The assignment (LET) and the comparative operator "=" found in expressions is always coded with the token byte $B2, only in strings it get coded as $3D. --JohannKlasek (talk) 01:19, 7 December 2021 (CET)

So when you say "in strings" do you mean "this string has an = sign" will have a $3D, but any = found outside a string is $B2? Maury Markowitz (talk) 14:46, 25 April 2022 (CEST)

Yes, exactly. You got it. :) You might put "in strings" as an abbreviation of "in a string constant, any character sequence started with a (") until a (") or end of line ... The parsing in the interpreter has two states: outside and inside a double-quoted character sequence. The inside part denotes a string constant. --JohannKlasek (talk) 21:58, 4 May 2022 (CEST)