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TT ——— The variables first and -ovrrent—are eguivalenv im struroral-zduivalet 18-18 55s89-ane-- te —: —

LT. Painters,

Hisoft Pascal 4 allows tte creation of dynamic varzazles ta"CuJN "te use 28 "te Štare o: Pezzndise
NEA (see Secrion 2). A dynasnic variable, unlike a static vatabie wnicr "4, DeMOry 32.22 altovaici
for it througtout tne blocx 1 which it is declared, cinnot Ze 'ever2.:20 Siraetiv meni" a
identifier since it does not have an identifier; instead a Ddointer varzable 18 used. T"i> polatea
var:able, which is a static variable, Contanns the address of the Oynamiz vactačble and te dynamic
variable itself is accessed dy including a '"' after the pointer vaniazie. Zrarzies o! tu.» --
pointer types can be studied in Appendix 4%..

There are some restrictions on the use of pointers within Hisoft Pascal 4, These are as foilaws:

Pointers to types that have not been declared are not allowed. Tms does not 5raovant "-
Construction of Unked list structures since type definitions may mntam pointers to Inerselves
0.3. ;

TYPE
item s RECORD
valve ; INTIGER:
next ; "item
END;
link » "item;
« d .
Pointers to pointers are not allowed.

UH
Pointers to tha sane type are regarded as eguivalent 9.9.

VAR
first : link;
current :; "item;

assigned to eact other or Campared,

The zredefined constant NIL is svoported anč when this 15 asstetjec.t3 a pC1r ter vdač...te re- --.
poznter variable 1s deemed ta contain no address

1... SEZ dne,

The imzlementation af FETCORDs, structured variač)23 TDTOCSAG IF u Šizac OUuMTE7 zr ceasliinemtš
Cali2d fielcs, within Hisaft Pascal $ is as Stanjurd Fascal exl217 tka! tne variaa! zart of the ticid

list is net suzported.

Two REČOHD types are only treated as ecuivalent if tneir declarati)N Sters fru:n tna sara
Cczsrrence of tne reserved word RECTRD see Section 1.7.4 above, :

The WITH statement may be used to access the different fields within < 7ecčra 1n a more 5na«s7
form,

See appencix l4j.for an ezample of the use of WITH and RECORDS mn general. '

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