HP SunSoft Pascal 4.0 Manual do Utilizador descarregar pdf (Página 107)

100

101

Separate Compilation 83

Using the define Declaration

This example deﬁnes global in the module defvar_mod2 using the define

declaration. The advantage of using the define declaration over the define

variable attribute is that the define declaration can be easily converted to use

include ﬁles.

The commands to compile and

execute defvar_prog.p and

defvar_mod.p

hostname% pc -xl defvar_prog.p defvar_mod.p

defvar_prog.p:

defvar_mod.p:

Linking:

hostname% a.out

From MAIN, before PROC: 1

From PROC : 1

From MAIN, after PROC : 2

The program unit,

defvar_prog.p

program defvar_prog;

var

global: extern integer;

procedure proc;

external;

begin

global := 1;

writeln('From MAIN, before PROC: ', global);

proc;

writeln('From MAIN, after PROC: ', global)

end. { defvar_prog }

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