Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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In a programming language (Pascal), the declaration of a node in a singly linked
list is shown in Figure P6.7(a). The list referred to for the problem is shown in
Figure P6.7(b). Given P to be a pointer to a node, the instructions DATA(P) and
LINK(P) referring to the DATA and LINK fields, respectively, of node P are
equivalently represented by P↑. DATA and P↑. LINK in the programming language.
What do the following commands do to the logical representation of the list T?
i)
ii)
TYPE
POINTER=NODE;
NODE RECORD
DATA:
integer;
LINK: POINTER
END;
VAR P, Q R:
T
POINTER
(a) Declaration of a node in a singly linked list T
31
TE
57
12
(b) A singly linked list T
iii) R₁.LINK: = Q
iv) R₁.DATA: =
P₁.DATA: Q₁.DATA + R₁.DATA
Q: = P
|R
Figure P6.7. (a and b) Declaration of a node in a programming
language and the logical representation of a singly linked list T
Q.LINK.DATA + 10
91
Linked Lists
189
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Transcribed Image Text:In a programming language (Pascal), the declaration of a node in a singly linked list is shown in Figure P6.7(a). The list referred to for the problem is shown in Figure P6.7(b). Given P to be a pointer to a node, the instructions DATA(P) and LINK(P) referring to the DATA and LINK fields, respectively, of node P are equivalently represented by P↑. DATA and P↑. LINK in the programming language. What do the following commands do to the logical representation of the list T? i) ii) TYPE POINTER=NODE; NODE RECORD DATA: integer; LINK: POINTER END; VAR P, Q R: T POINTER (a) Declaration of a node in a singly linked list T 31 TE 57 12 (b) A singly linked list T iii) R₁.LINK: = Q iv) R₁.DATA: = P₁.DATA: Q₁.DATA + R₁.DATA Q: = P |R Figure P6.7. (a and b) Declaration of a node in a programming language and the logical representation of a singly linked list T Q.LINK.DATA + 10 91 Linked Lists 189
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