HP SunSoft Pascal 4.0 Manuale Utente Scaricare il pdf (Pagina 151)

100

101

The C–Pascal Interface 127

The -calign option is not needed in the previous example, but may be

necessary if the record contains aggregates.

Non-Pascal Procedures

When you use the -xl option in compiling Pascal code, you can use the

nonpascal keyword to declare that an external procedure is written in

another language. This keyword generally causes everything to be passed by

reference.

The Pascal main program,

VarRecMain.p

program VarRecMain;

type

vr = record

case tag: char of

'a': (ch1, ch2: char);

'b': (flag: boolean);

'K': (ALIGN: integer)

end;

var

x: vr;

procedure VarRec(var d: vr); external c;

begin

x.tag := 'a';

x.ch1 := 'a';

x.ch2 := 'b';

VarRec(x);

writeln(x.ch2)

end. { VarRecMain }

The commands to compile and

execute VarRec.c and

VarRecMain.p

hostname% cc -c VarRec.c

hostname% pc -calign VarRec.o VarRecMain.p

hostname% a.out

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