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then is optional

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Luxferre
2026-06-13 12:08:57 +03:00
parent c40f39ae23
commit 3898d40f19
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lttb-manual.md
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@@ -10,7 +10,7 @@ Luxferre's Truly Tiny BASIC (henceforth LTTB) is a lean dialect of the BASIC pro
* A special pseudo-variable `$` holding a random number from 0 to 9999 * A special pseudo-variable `$` holding a random number from 0 to 9999
* Line numbering from 1 to 32767 * Line numbering from 1 to 32767
* Unbounded subroutine call stack * Unbounded subroutine call stack
* Supported commands: `LET`, `IF ... THEN`, `INPUT`, `PRINT`, `GOTO`, `GOSUB`, `RETURN`, `END`, `LIST`, `CLEAR` (synonym `NEW`), `RUN`, `LOAD`, `SAVE`, `BYE` * Supported commands: `LET`, `IF ... (THEN)`, `INPUT`, `PRINT`, `GOTO`, `GOSUB`, `RETURN`, `END`, `LIST`, `CLEAR` (synonym `NEW`), `RUN`, `LOAD`, `SAVE`, `BYE`
* Any invalid command is ignored, so it still is possible to use e.g. `REM` for comments * Any invalid command is ignored, so it still is possible to use e.g. `REM` for comments
* Allowed operations within expressions: `+`, `-`, `*`, `/`, parentheses `()` * Allowed operations within expressions: `+`, `-`, `*`, `/`, parentheses `()`
* Allowed relational operators with `IF` statements: `=`, `<>` (synonym `><`), `>`, `>=`, `<`, `<=` * Allowed relational operators with `IF` statements: `=`, `<>` (synonym `><`), `>`, `>=`, `<`, `<=`
@@ -51,11 +51,11 @@ The following commands are the core of LTTB.
Evaluates the expression `[expr]` and assigns the result to the variable `[var]`. `LET` is the only core command keyword that can be omitted in LTTB, because `[var]=` is enough to detect the assignment statement. Evaluates the expression `[expr]` and assigns the result to the variable `[var]`. `LET` is the only core command keyword that can be omitted in LTTB, because `[var]=` is enough to detect the assignment statement.
Examples: `let x=10`, `y = RND(1000)+8` Examples: `let x=10`, `y = $ + 8`
### `IF [expr1] [relop] [expr2] THEN [stmt]` ### `IF [expr1] [relop] [expr2] (THEN) [stmt]`
Execute a statement `[stmt]` if the relation denoted by `relop` holds between `[expr1]` and `[expr2]`. Unlike most other TB implementations, `THEN` is mandatory in LTTB. Execute a statement `[stmt]` if the relation denoted by `relop` holds between `[expr1]` and `[expr2]`. Using `THEN` is optional but recommended.
Examples: `IF A > B THEN LET C = A-B`, `IF X<1000 THEN GOTO 400` Examples: `IF A > B THEN LET C = A-B`, `IF X<1000 THEN GOTO 400`