Compaq BASIC for OpenVMS
Alpha and VAX Systems
User Manual

Chapter 11
11	Functions
11.1	Built-In Functions
11.1.1	Numeric Functions
11.1.1.1	ABS Function
11.1.1.2	INT and FIX Functions
11.1.1.3	SIN, COS, and TAN Functions
11.1.1.4	SQR Function
11.1.1.5	LOG10 Function
11.1.1.6	EXP Function
11.1.1.7	RND Function
11.1.2	Data Conversion Functions
11.1.2.1	ASCII Function
11.1.2.2	CHR$ Function
11.1.3	String Numeric Functions
11.1.3.1	FORMAT$ Function
11.1.3.2	NUM$ and NUM1$ Functions
11.1.3.3	VAL% and VAL Functions
11.1.4	String Arithmetic Functions
11.1.4.1	SUM$ and DIF$ Functions
11.1.4.2	QUO$, PLACE$, and PROD$ Functions
11.1.5	Date and Time Functions
11.1.5.1	DATE$ Function
11.1.5.2	DATE4$ Function
11.1.5.3	TIME$ Function
11.1.5.4	TIME Function
11.1.6	Terminal Control Functions
11.1.6.1	CTRLC and RCTRLC Functions
11.1.6.2	ECHO and NOECHO Functions
11.1.6.3	INKEY$ Function
11.2	User-Defined Functions
11.2.1	Single-Line DEF Functions
11.2.2	Multiline DEF Functions
Chapter 12
12	String Handling
12.1	Overview of Strings
12.2	Using Dynamic Strings
12.3	Using Fixed-Length Strings
12.4	Using String Virtual Arrays
12.5	Assigning String Data
12.5.1	LET Statement
12.5.2	LSET Statement
12.5.3	RSET Statement
12.5.4	MID$ Assignment Statement
12.6	Manipulating String Data with String Functions
12.6.1	LEN Function
12.6.2	POS Function
12.6.3	SEG$ Function
12.6.4	MID$ Function
12.6.5	STRING$ Function
12.6.6	SPACE$ Function
12.6.7	TRM$ Function
12.6.8	EDIT$ Function
12.7	Manipulating String Data with Multiple Maps
Chapter 13
13	Program Segmentation
13.1	BASIC Subprograms
13.1.1	SUB Subprograms
13.1.2	FUNCTION Subprograms
13.2	Declaring Subprograms and Parameters
13.3	Compiling Subprograms
13.4	Invoking Subprograms
13.4.1	Invoking SUB Subprograms
13.4.2	Invoking FUNCTION Subprograms
13.5	Returning Program Status
Chapter 14
14	File Input and Output
14.1	Record Formats
14.1.1	Fixed-Length Records
14.1.2	Variable-Length Records
14.1.3	Stream Records
14.2	File Organizations
14.2.1	Terminal-Format Files
14.2.2	Sequential Files
14.2.3	Relative Files
14.2.4	Indexed Files
14.2.5	Virtual Files
14.3	Record Access and Record Context
14.4	I/O and Record Buffers
14.5	Accessing the Contents of a Record
14.5.1	MAP Statement
14.5.2	MAP DYNAMIC and REMAP Statements
14.5.3	MOVE Statement
14.6	File and Record Operations
14.6.1	Opening Files
14.6.2	Creating Virtual Array Files
14.6.3	Locating Records
14.6.4	Reading Records
14.6.5	Writing Records
14.6.6	Deleting Records
14.6.7	Updating Records
14.6.8	Controlling Record Access
14.6.9	Gaining Access to Locked Records
14.6.10	Accessing Records by Record File Address
14.6.11	Transferring Data to Terminal-Format Files
14.6.12	Resetting the File Position
14.6.13	Truncating Files
14.6.14	Renaming Files
14.6.15	Closing Files and Ending I/O
14.6.16	Deleting Files
14.7	File-Related Functions
14.7.1	FSP$ Function
14.7.2	RECOUNT Function
14.7.3	STATUS, VMSSTATUS, and RMSSTATUS Functions
14.8	OPEN Statement Options
14.8.1	BUCKETSIZE Clause
14.8.2	BUFFER Clause
14.8.3	CONNECT Clause
14.8.4	CONTIGUOUS Clause
14.8.5	DEFAULTNAME Clause
14.8.6	EXTENDSIZE Clause
14.8.7	FILESIZE Clause
14.8.8	NOSPAN Clause
14.8.9	RECORDTYPE Clause
14.8.10	TEMPORARY Clause
14.8.11	USEROPEN Clause
14.8.12	WINDOWSIZE Clause