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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
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
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Programming Language Pragmatics, 4th Edition 

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.
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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