HP SunSoft Pascal 4.0 Manual de usuario Pagina 100

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76 Pascal 4.0 Users Guide
5
Using Program Units
The program unit is the source program with the program header. It has the
following syntax:
<program unit> ::= <program heading> <declaration list> <program body>
Each program you write can have only one program unit. The program body
is the first code that Pascal executes.
Using Module Units
A module unit is a source program that does not have a program header. It
has the following syntax:
<module unit> ::= [ <module heading>]<declaration list>
The module heading contains the reserved word module followed by an
identifier:
<module heading> ::= [ 'module' <identifier> ';' ]
For example:
This is a legal module heading. The module heading is optional.
Sharing Variables and Routines Across Multiple Units
Pascal supports three methods of sharing variables and routines between units:
include files
Multiple variable declarations
extern/define variable declarations
These methods are not mutually exclusive; for example, you can declare a
variable as either extern or define in an include file.
The following sections describe these methods.
module sum;
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