Keyword Table
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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" operatorsDIV
MOD
AND
OR
XOR
andNOT
are also treated as keywords, but are listed in the Operator Table.
Declarations/Variables
Keyword | Description |
---|---|
VAR | 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 | Print values on the console text screen. |
? | |
TPRINT | 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. |