The following is a high level description for a luring machine M. List the first four elements of L(M) inlexicographic order (shortest first, then alphabetically if same length).1. Move right.2. Loop:2.1. If the current symbol is x, change it to $ and move right. Otherwise exit loop.2.2. Scan rightwards, past x's and #'s to find y.2.3. If y found, change it to # and move right. Otherwise reject.2.4. Scan rightwards, past y's and %'s to find z.2.5. If z found, change it to % and move left. Otherwise reject.2.6. Scan leftwards, past x's, y's, #'s and %'s to find $.2.7. When finding the first $, move right, and go back to 2.1.3. If the current symbol is #, more right. Otherwise reject.4. Scan rightwards, past #'s and %'s, to find the blank symbol.5. When finding the first blank symbol, move right and accept.€, xyz, xxyyzz, xxxyyyzzzxyz, xxyyzz, xxxyyyzzz, xxxxyyyyzzzz€, ZyX, ZZYYXX, ZZZYYYXXXzYX, ZZYYXX, ZZZYYYXXX, ZZZZYYYYXXXX

Consider the given information :

1. Move right. 2. Loop: 2.1. If the current symbol is x, change it to $ and move right. Otherwise exit loop. 2.2. Scan rightwards, past x's and #'s to find y. 2.3. If y found, change it to # and move right. Otherwise reject.

1. Move right. 2. Loop: 2.1. If the current symbol is x, change it to $ and move right. Otherwise exit loop. 2.2. Scan rightwards, past x's and #'s to find y. 2.3. If y found, change it to # and move right. Otherwise reject.

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

Types of Loop

Loops are the elements of programming in which a part of code is repeated a particular number of times. Loop executes the series of statements many times till the conditional statement becomes false.

Loops

Any task which is repeated more than one time is called a loop. Basically, loops can be divided into three types as while, do-while and for loop. There are so many programming languages like C, C++, JAVA, PYTHON, and many more where looping statements can be used for repetitive execution.

While Loop

Loop is a feature in the programming language. It helps us to execute a set of instructions regularly. The block of code executes until some conditions provided within that Loop are true.

Question

The following is a high level description for a luring machine M. List the first four elements of L(M) in
lexicographic order (shortest first, then alphabetically if same length).
1. Move right.
2. Loop:
2.1. If the current symbol is x, change it to $ and move right. Otherwise exit loop.
2.2. Scan rightwards, past x's and #'s to find y.
2.3. If y found, change it to # and move right. Otherwise reject.
2.4. Scan rightwards, past y's and %'s to find z.
2.5. If z found, change it to % and move left. Otherwise reject.
2.6. Scan leftwards, past x's, y's, #'s and %'s to find $.
2.7. When finding the first $, move right, and go back to 2.1.
3. If the current symbol is #, more right. Otherwise reject.
4. Scan rightwards, past #'s and %'s, to find the blank symbol.
5. When finding the first blank symbol, move right and accept.
€, xyz, xxyyzz, xxxyyyzzz
xyz, xxyyzz, xxxyyyzzz, xxxxyyyyzzzz
€, ZyX, ZZYYXX, ZZZYYYXXX
zYX, ZZYYXX, ZZZYYYXXX, ZZZZYYYYXXXX

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