pTAL Reference Manual (H06.03+)

Contents

HP pTAL Reference Manual—523746-005

viii

13. Hardware Indicators (continued)

Hardware Indicators After Assignments 13-3

$OVERFLOW 13-3

$CARRY 13-4

Condition Codes 13-4

Hardware Indicators in Conditional Expressions 13-8

Nesting Condition Code Tests 13-12

Using Hardware Indicators Across Procedures 13-14

Testing a Hardware Indicator Set in the Calling Procedure 13-14

Returning a Condition Code to the Calling Procedure 13-15

Returning the Value of $OVERFLOW or $CARRY to the Calling Procedure 13-16

14. Procedures, Subprocedures, and Procedure Pointers

Procedure Declarations 14-2

Procedure Attributes 14-5

Parameters and VARIABLE and EXTENSIBLE Procedures 14-8

VARIABLE, EXTENSIBLE and RETURNSCC Procedures as Actual

Parameters 14-9

Formal Parameter Specification 14-10

Using STRUCT as a Formal Parameter 14-16

Passing an .EXT Parameter to a Non-EXTENDED Reference Parameter 14-16

Using the PROC Formal Parameter 14-16

Referencing Parameters 14-16

Procedure Body 14-17

Subprocedure Declarations 14-19

Subprocedure Body 14-21

Entry-Point Declarations

14-22

Procedure Entry-Point Identifiers

14-23

Subprocedure Entry-Point Identifiers 14-24

Procedure Pointers 14-26

Declaring PROCPTR Variables 14-29

Declaring PROCPTR in Structures 14-30

Declaring PROCPTRs as Formal Parameters 14-32

Assignments to PROCPTRs 14-33

Dynamically Selected Procedure Calls 14-35

Labels in Procedures 14-37