A.{w| w begins with an "a" and ends with a “b"} B.{w| w contains at least three a's} C.{w| w contains the substring “aba" D.{w| w has length at least 3 and its third symbol is an "a"} E. {w| w starts with "a" and has odd length, or starts with “b" and has even length} F. {w| w doesn't contain the substring "baa"}

A.{w| w begins with an "a" and ends with a “b"} B.{w| w contains at least three a's} C.{w| w contains the substring “aba" D.{w| w has length at least 3 and its third symbol is an "a"} E. {w| w starts with "a" and has odd length, or starts with “b" and has even length} F. {w| w doesn't contain the substring "baa"}

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

A.{w| w begins with an "a" and ends with a “b"}
B.{w| w contains at least three a's}
C.{w| w contains the substring "aba"
D.{w| w has length at least 3 and its third symbol is an "a"}
E. {w| w starts with "a" and has odd length, or starts with "b"
and has even length}
F. {w| w doesn't contain the substring "baa"}

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