HP SunSoft Pascal 4.0 Uživatelský manuál stáhnout pdf (Strana 95)

100

101

Program Construction and Management 71

In a real program, header.h would probably contain many declarations and

would be included in several modules. Aside from routine declarations,

header ﬁles often contain constant, type, and variable declarations.

Sharing Variables Between Units

Variables that are global across a unit (that is, not declared locally in a routine)

can be public or private. A public variable can be shared by any unit that

is linked to the unit that declares the variable. A private variable cannot be

shared.

You can use the public and private reserved words to declare that a var

section declares public or private variables. For example:

When you do not use public or private, variables are public by default.

However, when you compile with the -xl option, variables are private by

default.

To share a public variable, simply declare it in each unit where you want to

share it. As long as the variable is public, each reference to that variable

accesses the same data.

program program_unit3 (output);

public var

x : integer;

private var

y : integer;

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 332 333

Komentáře k této Příručce

Žádné komentáře

HP SunSoft Pascal 4.0 Uživatelský manuál Strana 95

Komentáře k této Příručce

Související produkty a manuály pro Software HP SunSoft Pascal 4.0