HP SunSoft Pascal 4.0 Bedienungsanleitung PDF herunterladen (Seite 104)

100

101

80 Pascal 4.0 User’s Guide

Using the -xl Option

When you use the –xl option, variables and top-level procedures and

functions declared in the program unit default to private. Look at the

difference when you compile and execute shrvar_prog.p and

shrvar_mod.p with –xl. See the source code in “Sharing Public Variables”

on page 77.

Without –xl, the variable global in shrvar_mod.p is treated as public;

here, global is treated as private. Thus, the assignment:

global := global + 1;

is not reﬂected in shrvar_prog.p; instead, each ﬁle uses its own private copy

of global.

The following sections describe ﬁve ways of sharing variables and routines

across units when you compile your program with –xl.

Usingpublic var Declarations

The following examples uses the public attribute in the var declaration to

make global public when you compile your program with –xl.

The commands to compile and

execute shrvar_prog.p and

shrvar_mod.p with the –xl

option

hostname% pc -xl shrvar_prog.p shrvar_mod.p

shrvar_prog.p:

shrvar_mod.p:

Linking:

hostname% a.out

From MAIN, before PROC: 1

From PROC : 0

From MAIN, after PROC: 1

1 2 ... 99 100 101 102 103 104 105 106 107 108 109 ... 332 333

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