empty string) and xy is their concatenation. Show that if x, y and xy are all in PALINDROME, then there is a word z such that x= z' and y=z" for some integers n and m. 3. (1 pt) Let S={ab, bb} and T={ab, bb, bbb}. Show that S*#T* but that S*cT*. 4. (1 pt) Write the regular expression for the language of all strings, over alphabet {a, b}, that end in a double letter, i.e. ending in aa or bb but not ab or ba 5. (1 pt) Draw Deterministic Finite Automata to accept the following sets of strings, over the alphabet {0,1}, that contain exactly four Os (not necessarily consecutive zeros) Extra Credit: (1 pt) Write the regular expression for the language of all strings, over alphabet {0, 1}, the set of all strings in which every pair of adjacent zeros appears before noont onog Luotifiu

empty string) and xy is their concatenation. Show that if x, y and xy are all in PALINDROME, then there is a word z such that x= z' and y=z" for some integers n and m. 3. (1 pt) Let S={ab, bb} and T={ab, bb, bbb}. Show that S#T but that ScT. 4. (1 pt) Write the regular expression for the language of all strings, over alphabet {a, b}, that end in a double letter, i.e. ending in aa or bb but not ab or ba 5. (1 pt) Draw Deterministic Finite Automata to accept the following sets of strings, over the alphabet {0,1}, that contain exactly four Os (not necessarily consecutive zeros) Extra Credit: (1 pt) Write the regular expression for the language of all strings, over alphabet {0, 1}, the set of all strings in which every pair of adjacent zeros appears before noont onog Luotifiu

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

Control structures

Control structures are block of statements that analyze the value of variables and determine the flow of execution based on those values. When a program is running, the CPU executes the code line by line. After sometime, the program reaches the point where it has to make a decision on whether it has to go to another part of the code or repeat execution of certain part of the code. These results affect the flow of the program's code and these are called control structures.

Switch Statement

The switch statement is a key feature that is used by the programmers a lot in the world of programming and coding, as well as in information technology in general. The switch statement is a selection control mechanism that allows the variable value to change the order of the individual statements in the software execution via search.

Question

Answer all. Otherwise I will report and downvote

2. (1 pt) Let x and y be two words (both different than the
empty string) and xy is their concatenation. Show that if x,
y and xy are all in PALINDROME, then there is a word z
such that x= z' and y=z" for some integers n and m.
3. (1 pt) Let S={ab, bb} and T={ab, bb, bbb}. Show that
S*#T* but that S*cT*.
4. (1 pt) Write the regular expression for the language of all
strings, over alphabet {a, b}, that end in a double letter, i.e.
ending in aa or bb but not ab or ba
5. (1 pt) Draw Deterministic Finite Automata to accept the
following sets of strings, over the alphabet {0,1}, that
contain exactly four Os (not necessarily consecutive zeros)
Extra Credit: (1 pt) Write the regular expression for the
language of all strings, over alphabet {0, 1}, the set of all
strings in which every pair of adjacent zeros appears before
any pair of adjacent ones. Justify.

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