Intel 9800758-02 manual Def Fnx, Rules for function name are the same as for variable name

Page 43

BASIC-SO

Commands and Statements

DATA

The DATA statement prefaces lines of data that are read sequentially by the READ command and assigned as values to variables. The data is separated by commas and may be numeric, strings, or quoted strings. If strings are not surrounded by quotes (" ") they may not contain commas (,) or semicolons (;) and leading or trailing blanks are ignored. DATA instruction lines may be located anywhere in program text. BASIC maintains a pointer which keeps track of the next DATA element to be read. This pointer is set to the first data element of the first DATA statement when a program is RUN. It increments to subsequent DATA elements when its elements are read. It can be moved with the RESTORE command.

DATA numbeq string literal Iquoted string

[, number Istring literal Iquoted string] ...

10 DATA 10, IS LESS THAN, 77

20DATA 44, IS GREATER THAN, -32

30DATA 1.7, "IS EQUAL TO ", 1.7EO

40FOR 1=1 TO 3

50READ X, A$, Y

60PRINT X; A$; Y

70NEXT RUN

10IS LESS THAN 77

44IS GREATER THAN -32 1.71S EQUAL TO 1.7

Ok

DEF FN(X)

The DEF FN(X) statement defines arithmetic or string functions for later use in pro- gram text. The name given to the function must be FN followed by a valid variable name. The variable(s) given are the arguments used within the function. Any one- line expression can be used. User-defined functions can be of any type, arithmetic or string, and any number of arguments are allowed. The correct number of parameters must be specified when the function is referenced within a program. Functions may not be redefined.

DEF function name [(variable [, variable ... ])]= expression

The rules for function name are the same as for variable name.

10DEF FNAC (X) = (1/(2*3.14159))*X

20FOR X = 1 TO 10

30PRINT FNAC (X),

40NEXT X

50END

RUN

.159155 .31831 .477465 .63662 .795776

.954931 1.11409 1.27324 1.4324 1.59155

6-3

Image 43

Contents BASIC-SO Reference Manual A108/0979/7500 FL Preface Page Contents Illustrations Invoking BASIC-80 Chapter Introduction to BASIC-80Filename ExamplesIntroduction to BASIC-80 Basic filename MEMTOPaddressDeleting a File Listing the Directory of a DiskRenaming a File Changing File AttributesSave LP ,A You can now run, list, or edit the programStatements CommandsBASIC-80 Statements BASIC-80 Commands ContdBASIC-80 Functions BASIC-80 Statements ContdBASIC-80 Functions Contd Functions Representing DataHexadecimal Integer Constants ConstantsInteger Constants Decimal Integer ConstantsSingle-Precision Floating-Point Constants Octal Integer ConstantsDouble-Precision Floating-Point Constants $ = Enter next data string String ConstantsString Variables This is a string constantYI,1 L4! = Csng l4String Arrays BASIC-SO Operators in Order of Precedence Contd Arithmetic OperatorsString Expressions Logical OperatorsString Operator Numeric ExpressionsEntering and Editing Programs 30 A--=8xx*522537 Control-R a = 8*37 30 A=8*5230 A=8 30 A=8*52 30 A=8*37If AB then SubcommandCommand 3D press 3, then D results Integer DIf AB then 120 Else Null SET At this point, the other editing subcommands may be used Syntax of the X subcommand isPrint Undefined SET. Enter a L Print Undefined SET The E subcommand is enteredInteger C character character Move the cursor to PRINT. Enter 2C RE LSyntax Error Messages BASIC-80 Error MessagesOverflow, Underflow, and Divide-by-Zero Error Trapping Trace Facility If line 40 is replaced with Error SimulationError Handling Restarting Program ExecutionOpen 1,#1,F1DATES Opening a Sequential FileIf executed four times, it would read all eight values Refer to for further details of Print UsingWriting to a Sequential File Reading from a Sequential FileValue of R$ would be Closing a Sequential FileDefining a Random 1/0 Field-FIELD BuffersField #3, 20 AS N$ Field #3, 20 AS N$, 9 AS SS$ Disk File Input/OutputTo read the next record Opening and Closing a Random Disk FileReading from a Random 1/0 File Any of the parameters can be variablesDouble-precision value Writing to a Random 1/0 FileInteger Single-precision valueMKI$ Clear expression,address Attrib Fdrive numberfilename, W1Attrib Fdrive numberfilename, WO Auto first lineJ, incrementClose Commands and StatementsRules for function name are the same as for variable name DEF FNXDefsng Defdbl Defstr Defint Delete DIMEND ErrorDIR EditFOR-NEXT-STEP Error expressionExit FieldGET I file number ,record number GETGosub For variable=expression to expression Step expressionInput IF-THEN-ELSEGoto List KillLET Line InputLoad LSET, RsetNEW Merge9 16 NextOn ... Goto On ... GosubOpen OUT Option BasePoke Print Print UsingString Fields If X$=SEVEN and Y$=EIGHT, the results of line 40 would be Numeric fieldsPUT PrunRead RandomizeREM Return Resume60 END SaveRUN line numberlstring expression ,F Line number RUN filename? 5,8,2 TRON, TroffWidth WaitATN ABSCint CHR$Functions AO/o = CsngCVI CVS 10 A# = 1.00/3.00EOF DskfOk· FIXINP HexsInputs Instr INTLEFT$ LOG LENLOC LOFMKI$ MKS$ MKD$ MID$OCT$ RIGHT$ string,integer RightsPeek expression POS integer10 a =1 SGNSIN SpacesSQRexpression SPCSPC integer If A$ = 2 then Print Correct Else GotoTAB expression STR$ expressionTAN expression 60 AO/o = Here is an example of how the USRn statement is usedTable A-I. BASIC-80 Error Codes Appendix a BASIC-SO Error CodesTable A-I. BASIC-SO Error Codes Contd Appendix B BASIC-SO Reserved Words Page To resume program execution after it is stopped by To halt program execution and return to commandLevel To tab across the linePage Appendix D Ascii Codes Table D-l. Ascii Code ListBEL Table D-2. Ascii Code DefinitionAppendixe Calling Subroutines Figure B-1. Internal Representation of Numbers and Strings RESULT=USR%1VARPTRA, VARPTRB, VARPTRC» PRINTA+B+C= Result Some Real ExamplesFigure E-2 /8085 Assembly Language Program Figure E-3. PL/M-80 Program Appendix F RMX/SO BASIC-SO ISIS-II BASIC-SO Initializing the Predefined RMX/SO BASIC-SO ConfigurationOOOOH-OFFFH Table F-l. Sample Configuration Jumper WiringBASIC-80 Executable Files Generating Boot-Loaded and PROM-Based VersionsBASIC-80 Source Files BASIC-80 Object FilesGenerating a Boot-Loaded RMX/80 BASIC-80 This option enables your user-written I/O drivers if you That are not boot loadedThis option is used to allocate memory. It is 1 if the boot Setting baud rates, refer to the RMX/SO Users GuideISBC 80/20-4 Generating a PROM-Based RMX/80 BASIC-80 Prom F1 RMX820.L1BSTART, & FOBASCM.OBJ,& FORMXBAS.LlB F1 DFSDIR. L1BDIRECTORY ,RENAM E,& F1 MTI810.L1B ISBC SO/10 System Clock Configuring DFS on an iSBC 80/10Adding BASIC-SO to an Existing RMX/SO Configuration Configuration RequirementsPublic Variables Open 0,#1, L1LlST Adding User-Written I/O Drivers to RMX/SO BASIC-SOFigure F-S. Sample User-Written 1/0 Driver Routine Burning a BASIC-80 Program Into Prom Altering BASIC-80 WorkspaceBaprom F1HEATER.BAS Page Index Ase BASIC-80 RIGHT$,7-1O Request for Readerscomments 111111