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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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
Transcribed Image Text: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?
Transcribed Image Text: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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