Keyword Table

A *keyword* is a special identifier reserved by the language syntax. They are used for control structures and special language features. A keyword cannot be used as a name for a variable or user-defined function in most cases. > *Note:* do not confuse keywords with operators. The "word" operators `DIV` `MOD` `AND` `OR` `XOR` and `NOT` are also treated as keywords, but are listed in the sbs:page/3164[Operator Table]. * Declarations/Variables |* Keyword | Description | | `VAR` |#rs=2 Declares a variable or array. | | `DIM` | | `VAR()` | Refer to a variable given its name as a string. | | `DIM()` | Check the dimensions of an array. | | `DEF` | Starts a function definition. | | `COMMON` | Comes before `DEF` to mark this function as available to all slots. | | `INC` | Increment a variable or append to a string. | | `DEC` | Decrement a variable. | | `SWAP` | Swaps the values of two variables. | | `DEFOUT` | Set a return value by position. Only usable within user-defined functions. | | `OUT` | Specifies the return value list of a function. | | `CONST` | Declare a constant. | | `ENUM` | Declare an enum. | * Control Structures ** General |* Keyword | Description | | `END` | Ends the program, or marks the end of a function definition. | | `RETURN` | Returns from a `GOSUB` or `DEF`.\ Within expression-style `DEF`, `RETURN` accepts a return value. | | `EXEC` | Executes a program or slot. | | `CALL` | Call a function given its name and parameters. | | `BREAK` | Exit the loop immediately.\ When used with `ON BREAK GOTO`, specify the label to `GOTO` when Plus is pressed. | | `CONTINUE` | Skip to the next iteration of the loop. | ** IF Statements |* Keyword | Description | | `IF` | Starts an `IF` statement. | | `THEN` | Comes after the condition in an `IF` or `ELSEIF` (except when using `GOTO`.) | | `ELSEIF` | Starts an `ELSEIF` branch in a multi-line `IF`. | | `ELSE` | Starts the `ELSE` section of an `IF` statement. | | `ENDIF` | Ends a multi-line `IF` statement. | ** CASE Statements |* Keyword | Description | | `CASE` | Starts a `CASE` statement, specifying the case value. | | `WHEN` | Specifies a possible match for the `CASE` statement. | | `OTHERWISE` | Specifies the path to take when nothing matches (or, matches anything.) | | `ENDCASE` | Ends the `CASE` statement. | ** LOOP |* Keyword | Description | | `LOOP` | Starts a `LOOP`. | | `ENDLOOP` | Ends a `LOOP`. | ** FOR Loop |* Keyword | Description | | `FOR` | Starts a `FOR` loop. | | `TO` | Specifies the end value.\ `TO` is only a keyword when used in the context of a `FOR` loop. | | `STEP` | Specifies the step value.\ `STEP` is only a keyword when used in the context of a `FOR` loop. | | `NEXT` | Ends a `FOR` loop. | ** WHILE Loop |* Keyword | Description | | `WHILE` | Starts a `WHILE` loop, specifying the loop condition. | | `WEND` | Ends a `WHILE` loop. | ** REPEAT Loop |* Keyword | Description | | `REPEAT` | Starts a `REPEAT` loop. | | `UNTIL` | Ends a `REPEAT` loop, specifying the loop condition. | ** GOTO |* Keyword | Description | | `GOTO` | Jump to the given label. | | `GOSUB` | Jump to the given label, as a subroutine.\ The label can be returned from using `RETURN`. | | `ON` | Starts an `ON` statement. | * Text Screen / Console |* Keyword | Description | | `PRINT` |#rs=2 Print values on the console text screen. | | `?` | | `TPRINT` |#rs=2 Print values on a text screen. | | `T?` | | `INPUT` | Read values from keyboard input on the console screen. | | `LINPUT` | Read a line of keyboard input on the console screen. | | `??` | Special alias of the `INSPECT` function. | * DATA |* Keyword | Description | | `DATA` | Starts a `DATA` statement. | | `READ` | Read values from the current `DATA` position. | | `RESTORE` | Set/push/pop the `DATA` read position. | * Other |* Keyword | Description | | `REM` | Starts a comment. |