pTAL Reference Manual (H06.03+)

Introduction to pTAL

HP pTAL Reference Manual—523746-005

1-5

Recursion

Because each activation of a procedure or subprocedure has its own data area, a

procedure or subprocedure can call itself or can call another procedure that in turn

calls the original procedure.

Parameters

A procedure or subprocedure can have optional or required parameters. The same

procedure or subprocedure can process different sets of variables sent by different

calls to it.

Data Types

A pTAL program can declare and refer to the following types of data:

Data Grouping

A pTAL program can declare and use groups of related variables, such as arrays and

structures (records).

Data Type Description

STRING 8-bit integer byte

INT, INT(16) 16-bit integer word

INT(32) 32-bit integer doubleword

FIXED, FIXED(0), INT(64) 64-bit integer quadrupleword

FIXED(-19 to -1) Fixed-point quadrupleword

FIXED(1 to 19) Fixed-point quadrupleword

REAL, REAL(32) 32-bit floating-point doubleword

REAL(64) 64-bit floating-point quadrupleword

UNSIGNED(

n) n-bit field, where 1 <= n <= 31

BADDR 32-bit byte address

WADDR 32-bit 2-byte address

CBADDR 32-bit byte code word address

CWADDR 32-bit 2-byte code word address

SGBADDR 16-bit SG-relative byte address

SGWADDR 16-bit SG-relative 2-byte address

SGXBADDR 32-bit SG-relative 2-byte address

SGXWADDR 32-bit SG-relative 2-byte address

EXTADDR 32-bit byte address

PROCADDR 32-bit code byte address