Fields of packed records (Example 8.8) cannot be passed by reference in Pascal. Likewise, when passing a subrange variable by reference, Pascal requires that all possible values of the corresponding formal parameter be valid for the subrange: type small = 1..100; R = record x, y : small; end; S = packed record x V : small: end:
Fields of packed records (Example 8.8) cannot be passed by reference in Pascal. Likewise, when passing a subrange variable by reference, Pascal requires that all possible values of the corresponding formal parameter be valid for the subrange: type small = 1..100; R = record x, y : small; end; S = packed record x V : small: end:
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:9.14 Fields of packed records (Example 8.8) cannot be passed by reference in Pascal.
Likewise, when passing a subrange variable by reference, Pascal requires that all
possible values of the corresponding formal parameter be valid for the subrange:
type small = 1..100;
R = record x, y : small; end;
S = packed record x, y : small; end;
a : 1..10;
b : 1..1000;
var
C : R;
d : S;
procedure fo0 (var n : small);
begin
n := 100;
writeln(a);
end;
a := 2;
foo(b);
(* ok *)
foo(a);
(* static semantic error *)
foo(c.x);
foo(d.x);
(* ok *)
(* static semantic error *)
Using what you have learned about parameter-passing modes, explain these lan-
guage restrictions.
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