In a programming language (Pascal), the declaration of a node in a singly linke 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 an 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? TYPE POINTER NODE; NODE RECORD END; VAR P, Q R: T POINTER (a) Declaration of a node in a singly linked list T 31 DATA: integer; LINK: POINTER i) ii) Q = P iii) R₁.LINK: = Q iv) R₁.DATA: = 57 P₁.DATA: Q₁.DATA + R₁.DATA |R (b) A singly linked list T 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 18

In a programming language (Pascal), the declaration of a node in a singly linke 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 an 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? TYPE POINTER NODE; NODE RECORD END; VAR P, Q R: T POINTER (a) Declaration of a node in a singly linked list T 31 DATA: integer; LINK: POINTER i) ii) Q = P iii) R₁.LINK: = Q iv) R₁.DATA: = 57 P₁.DATA: Q₁.DATA + R₁.DATA |R (b) A singly linked list T 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 18

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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Concept explainers

Use of XOR function

XOR function or exclusive OR function was introduced in Excel 2013. This function is available under excel logical functions. For the given statement, the XOR function will return true only when either of the statements is true. It returns false when both the statements are true or when both the statements are false.

Question

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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