Section 10: Lynx Software Components; Lynx Software Components; Variables; Commonly Used Variables - IMS MicroLYNX Quick Manual

LYNX Software Components

L Y N X S o f t w a r e C o m p o n e n t s
The LYNX instruction set has 4 basic components. These are:
This section will cover the most commonly used Variables, Instructions,
Flags and Keywords. If your application requires more complex instructions,
the full instruction set is detailed in Part 3 of the LYNX Product Family
Operating Instructions on the CD. There is also a summary of the full
instruction set in Appendix A of this document.
V a r i a b l e s
Variables are registers which allow you to assign a name to a numeric
value. They may be used in conjunction with the math functions to
manipulate the data contained in them. There are two types
of variables:
F a c t o r y
These variables are pre-defined at the factory and cannot be
deleted. When an IP (Initialize Parameters) instruction is given,
these variables will be set to their factory default state. There
are two types of factory defined variables: Read/Writable and
Read Only.
U s e r
One of the powerful features of the LYNX instruction set is that it allows
the user to define variables both inside a program (local) or outside a pro-
gram (global). User-defined variables are deleted by means of the DVF
(Delete Variables and Flags) instruction. Defining user variables will be
covered in more depth in Section 11: LYNX Programming Conventions.
C o m m o n l y U s e d V a r i a b l e s
The following factory-defined variables constitute the most commonly used
in LYNX programs. A full listing of the factory-defined variables are avail-
able in the instruction set summary in Appendix A of this document. In the
case where a variable has been covered in depth earlier in this document,
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1]

Variables

2] Instructions
3] Flags
4] Keywords
1] Factory-defined
2] User-defined
10
A Variable is a component of
the LYNX instruction set that
allows you to store, read and
manipulate numeric data. They
can also be used to effect
events inside a program!