HP SunSoft Pascal 4.0 Manuale Utente Scaricare il pdf (Pagina 132)

100

101

108 Pascal 4.0 User’s Guide

When you compile the Pascal routine without using the -calign option, the

program does not work correctly.

Variant Records

C equivalents of variant records can sometimes be constructed, although there

is some variation with architecture and sometimes a need to adjust alignment.

You can avoid the need to adjust alignment by using the -calign option.

The commands to compile and

execute DayWeather.p and

DayWeatherMain.c

without

-calign

hostname% pc -c DayWeather.p

hostname% cc DayWeather.o DayWeatherMain.c -lpc

hostname% a.out

day = ''

weather = ' sun'

The commands to compile and

execute DayWeather.p and

DayWeatherMain.c

with

-calign

hostname% pc -calign -c DayWeather.p

hostname% cc DayWeather.o DayWeatherMain.c -lpc

hostname% a.out

day = 'Sunday'

weather = 'sunny'

The Pascal procedure,

VarRec.p

type

vr = record

case tag: char of

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

'b': (flag: boolean);

'K': (ALIGN: integer);

end;

procedure VarRec(var x: vr);

begin

if x.ch1 = 'a' then

x.ch2 := 'Z'

end; { VarRec }

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HP SunSoft Pascal 4.0 Manuale Utente Pagina 132

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