HP SunSoft Pascal 4.0 Manual de usuario descargar pdf (Pagina 120)

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101

96 Pascal 4.0 User’s Guide

Simple Types with –xl

With the -xl option, the Pascal real must be paired with a C float, and the

Pascal integer must be paired with a C short int.

Strings of Characters

The C counterpart to the Pascal alfa and string types are arrays; C passes

all arrays by reference. The C counterpart to the Pascal varying is a structure;

C passes structures by value.

Before you call Pascal with a null varying string, set the byte count to zero

because that is what Pascal assumes about such strings.

C can pass a structure consisting of a four-byte integer and an array of

characters to a Pascal procedure, expecting a var parameter that is a variable-

length string.

See the following example:

The commands to compile and

execute SimVar.p and

SimVarMain.c

hostname% pc -c SimVar.p

hostname% cc SimVar.o SimVarMain.c

hostname% a.out

00000001 00000000 z 9 9 9.9 9.9

The Pascal procedure,

StrVar.p

type

TVarStr = varying [25] of char;

procedure StrVar(

var a: alfa;

var s: string;

var v: TVarStr);

begin

a := 'abcdefghi' + chr(0);

s := 'abcdefghijklmnopqrstuvwxyz' + chr(0);

v := 'varstr' + chr(0);

end; { StrVar }

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HP SunSoft Pascal 4.0 Manual de usuario Pagina 120

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