FIGURE 2.16 Get values forn and m, the size of the text and the pattern, respectively Get values for both the text T, T, ... T, and the pattern P, P, ... P, Set k, the starting location for the attempted match, to 1 While (k s (n 1 m m + 1)) do Set the value of i to 1 Set the value of Mismatch to NO While both (is m) and (Mismatch = NO) do If P, +T then k+(i-1) Set Mismatch to YES Else Increment i by 1 (to move to the next character) End of the loop If Mismatch Print the message 'There is a match at position' NO then Print the value of k Increment k by 1 End of the loop Stop Final draft of the pattern-matching algorithm

FIGURE 2.16 Get values forn and m, the size of the text and the pattern, respectively Get values for both the text T, T, ... T, and the pattern P, P, ... P, Set k, the starting location for the attempted match, to 1 While (k s (n 1 m m + 1)) do Set the value of i to 1 Set the value of Mismatch to NO While both (is m) and (Mismatch = NO) do If P, +T then k+(i-1) Set Mismatch to YES Else Increment i by 1 (to move to the next character) End of the loop If Mismatch Print the message 'There is a match at position' NO then Print the value of k Increment k by 1 End of the loop Stop Final draft of the pattern-matching algorithm

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

Theoretical Computer Science

Usually, computer science seems like a practical field that involves studying, building, and working closely with computers. However, a subclass of this discipline also centers on the mathematical factors of the same. This is called theoretical computer science, and its focal point differentiates it from other branches of computer science: the rigorous mathematical approach it takes. This discipline falls under the umbrella of discrete mathematics, which is the study of countable or discontinuous mathematical structures.

Question

FIGURE 2.16
Get values for n and m, the size of the text and the pattern, respectively
Get values for both the text T,
T and the pattern P, P2
P
2
...
1
Set k, the starting location for the attempted match, to 1
While (k s (n – m + 1)) do
Set the value of i to 1
Set the value of Mismatch to NO
While both (i s m) and (Mismatch
If P. #T,
= NO) do
then
k+(i-1)
Set Mismatch to YES
Else
Increment i by 1 (to move to the next character)
End of the loop
If Mismatch = NO then
Print the message 'There is a match at position'
Print the value of k
Increment k by 1
End of the loop
Stop
Final draft of the pattern-matching algorithm

18. Refer to the pattern-matching algorithm in
Figure 2.16.
a. What is the output of the algorithm as it
currently stands if our text is
Text: We must band together and
handle adversity
and we search for the pattern "and"?
b. How could we modify the algorithm so
that it finds only the complete word and
rather than the occurrence of the character
sequence a, n, and d that is contained
within another word, such as band?

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