Compaq BASIC for OpenVMS
Alpha and VAX Systems
User Manual

Chapter 15
15	Formatting Output with the PRINT USING Statement
15.1	Overview of the PRINT USING Statement
15.2	Using Format Strings
15.3	Printing Numbers
15.3.1	Specifying the Number of Digits
15.3.2	Specifying Decimal Point Location
15.3.3	Printing Numbers with Special Symbols
15.3.3.1	Commas
15.3.3.2	Asterisk-Fill Fields
15.3.3.3	Currency Symbols
15.3.3.4	Negative Fields
15.3.3.5	E (Exponential) Format
15.3.3.6	Leading Zeros
15.3.3.7	Blank-If-Zero Fields
15.3.3.8	Debits and Credits
15.4	Printing Strings
15.4.1	Left-Justified Format
15.4.2	Right-Justified Format
15.4.3	Centered Fields
15.4.4	Extended Fields
15.5	PRINT USING Statement Error Conditions
Chapter 16
16	Handling Run-Time Errors
16.1	Default Error Handling
16.2	User-Supplied Error Handlers
16.2.1	Protected Regions
16.2.2	Handlers
16.2.3	Exiting from Handlers
16.2.3.1	RETRY Statement
16.2.3.2	CONTINUE Statement
16.2.3.3	EXIT HANDLER Statement
16.2.4	Selecting the Severity of Errors to Handle
16.2.5	Identifying Errors
16.2.5.1	Determining the Error Number (ERR)
16.2.5.2	Determining the Error Line Number (ERL)
16.2.5.3	Determining Where the Error Occurred (ERN$)
16.2.5.4	Determining the Error Message Text (ERT$)
16.2.5.5	Determining OpenVMS Error Information
16.2.5.6	Determining RMS Error Information
16.2.6	Ctrl/C Trapping
16.2.7	Handling Errors in Multiple-Unit Programs
16.2.8	Forcing Errors
16.3	Using the ON ERROR Statements
Chapter 17
17	Compiler Directives
17.1	Overview of Compiler Directives
17.2	Controlling the Compilation Listing
17.2.1	%TITLE and %SBTTL Directives
17.2.2	%IDENT Directive
17.2.3	%PAGE Directive
17.2.4	%LIST and %NOLIST Directives
17.2.5	%CROSS and %NOCROSS Directives
17.3	Accessing External Source Files
17.4	Controlling Compilation
17.4.1	%LET Directive
17.4.2	%VARIANT Directive
17.4.3	%ABORT Directive
17.4.4	%PRINT Directive
17.4.5	%IF-%THEN-%ELSE-%END %IF Directive
17.4.6	%DEFINE and %UNDEFINE Directives
17.5	Record Dependency Relationships in CDD/Repository
Chapter 18
18	Data Representation
18.1	Integer Format
18.1.1	Byte-Length Integer Format
18.1.2	Word-Length Integer Format
18.1.3	Longword Integer Format
18.1.4	Quadword Integer Format (Alpha BASIC Only)
18.2	Real Number Format
18.2.1	SINGLE Floating-Point Number Format (F_floating)
18.2.2	DOUBLE Floating-Point Number Format (D_floating)
18.2.3	GFLOAT Floating-Point Number Format (G_floating)
18.2.4	HFLOAT Floating-Point Number Format (H_floating)---VAX BASIC Only
18.2.5	SFLOAT Floating-Point Number Format (S_floating)---Alpha BASIC Only
18.2.6	TFLOAT Floating-Point Number Format (T_floating)---Alpha BASIC Only
18.2.7	XFLOAT Floating-Point Number Format (X_floating)---Alpha BASIC Only
18.3	Packed Decimal Number Format
18.4	String and Array Descriptor Format
18.4.1	Fixed-Length String Descriptor Format
18.4.2	Dynamic String Descriptor Format
18.5	Array Descriptors
18.6	Decimal Scalar String Descriptor (Packed Decimal String Descriptor)
Part 3
Part 3	Using BASIC Features on OpenVMS Systems
Chapter 19
19	Advanced File Input and Output
19.1	RMS I/O to Magnetic Tape
19.1.1	Allocating and Mounting a Tape
19.1.2	Opening a Tape File for Output
19.1.3	Opening a Tape File for Input
19.1.4	Positioning a Tape
19.1.5	Writing Records to a File
19.1.6	Reading Records from a File
19.1.7	Controlling Tape Output Format
19.1.8	Rewinding a Tape
19.1.9	Closing a File
19.2	Device-Specific I/O
19.2.1	Device-Specific I/O to Unit Record Devices
19.2.2	Device-Specific I/O to Magnetic Tape Devices
19.2.2.1	Allocating and Mounting a Tape
19.2.2.2	Opening a Tape File for Output
19.2.2.3	Opening a Tape File for Input
19.2.2.4	Writing Records to a File
19.2.2.5	Reading Records from a File
19.2.2.6	Rewinding a Tape
19.2.2.7	Closing a Tape
19.2.3	Device-Specific I/O to Disks
19.2.3.1	Assigning and Mounting a Disk
19.2.3.2	Opening a Disk File for Output
19.2.3.3	Opening a Disk File for Input
19.2.3.4	Writing Records to a Disk File
19.2.3.5	Reading Records from a Disk File
19.3	I/O to Mailboxes
19.4	Network I/O
19.4.1	Remote File Access
19.4.2	Task-to-Task Communication
19.4.3	Accessing a VAX Rdb/VMS Database