Computer Science: An Overview (12th Edition)
12th Edition
ISBN: 9780133760064
Author: Glenn Brookshear, Dennis Brylow
Publisher: PEARSON
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Chapter 6, Problem 41CRP
Program Plan Intro
Syntax diagram:
Syntax diagram is the
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The language composed of all strings over the
alphabet {a,b} of the
form: zero or more a's followed by zero or more b's,
i.e., {"", a, b,
aa, ab, bb, aaa, aab, abb, bbb, ...}, where "" is the
empty string, is
a regular language: show why this is. Note that you
may use any line
of argument on regular languages, e.g., by showing
that it can be constructed using the properties
("Regular
Language: a formal definition"), or by drawing the
finite state
automaton (FSA), or giving its description.
. Prove that the intersection of two context-free languages is not necessarily context-free. This is unlike the
case of regular languages which are closed under intersections. Hint: Do something similar to what we did on
Activity #21 to show something about two of the languages below and then use what we proved in class about
the remaining language. Write several sentences to explain your reasoning.
L₁ = {ww has the form a"b"c" for some whole numbers n and m}
L2 = {ww has the form amb"c" for some whole numbers n and m}
L3 = {w|w has the form a"b"c" for some whole number n}
Formalize the following sentence in english:
3X. elephant(X)|
Chapter 6 Solutions
Computer Science: An Overview (12th Edition)
Ch. 6.1 - In what sense is a program in a third-generation...Ch. 6.1 - We can summarize the imperative programming...Ch. 6.1 - Prob. 4QECh. 6.2 - Why is the use of a constant considered better...Ch. 6.2 - Prob. 2QECh. 6.2 - Prob. 3QECh. 6.2 - Identity some common control structures found in...Ch. 6.2 - What is the difference between an array and an...Ch. 6.3 - Prob. 1QECh. 6.3 - Prob. 2QE
Ch. 6.3 - Why do many programming languages implement I/O...Ch. 6.3 - Prob. 4QECh. 6.3 - Prob. 5QECh. 6.4 - Prob. 1QECh. 6.4 - What is a symbol table?Ch. 6.4 - What is the difference between a terminal and a...Ch. 6.4 - Prob. 4QECh. 6.4 - Prob. 5QECh. 6.4 - Prob. 6QECh. 6.5 - What is the difference between an object and a...Ch. 6.5 - Prob. 2QECh. 6.5 - Suppose the classes PartTimeEmployee and...Ch. 6.5 - What is a constructor?Ch. 6.5 - Why are some items within a class designated as...Ch. 6.6 - Prob. 1QECh. 6.6 - Prob. 2QECh. 6.6 - Prob. 3QECh. 6.7 - Prob. 2QECh. 6.7 - Prob. 3QECh. 6.7 - Prob. 4QECh. 6 - Prob. 1CRPCh. 6 - Translate the following Python program into the...Ch. 6 - Prob. 3CRPCh. 6 - Why was it necessary to identify the type of data...Ch. 6 - Prob. 6CRPCh. 6 - Suppose the function f expects two numeric values...Ch. 6 - Suppose f is a function that returns the result of...Ch. 6 - Prob. 9CRPCh. 6 - Summarize the distinction between a machine...Ch. 6 - John Programmer argues that the ability to declare...Ch. 6 - Summarize the distinction between declarative...Ch. 6 - Explain the differences between a literal, a...Ch. 6 - a. What is operator precedence? b. Depending on...Ch. 6 - Prob. 16CRPCh. 6 - What is the difference between the meaning of the...Ch. 6 - Draw a flowchart representing the structure...Ch. 6 - Prob. 19CRPCh. 6 - Prob. 20CRPCh. 6 - Draw a flowchart representing the structure...Ch. 6 - Rewrite the following program segment using a...Ch. 6 - Summarize the following rats-nest routine with a...Ch. 6 - Prob. 24CRPCh. 6 - Prob. 25CRPCh. 6 - Suppose the variable X in a program was declared...Ch. 6 - Prob. 27CRPCh. 6 - Why would a large array probably not be passed to...Ch. 6 - Sometimes an actual parameter is passed to a...Ch. 6 - Prob. 32CRPCh. 6 - What ambiguity exists in the statement X = 3 + 2 ...Ch. 6 - Suppose a small company has five employees and is...Ch. 6 - Prob. 35CRPCh. 6 - Prob. 36CRPCh. 6 - Prob. 37CRPCh. 6 - Prob. 38CRPCh. 6 - Prob. 39CRPCh. 6 - Design a set of syntax diagrams that describes the...Ch. 6 - Prob. 41CRPCh. 6 - Prob. 42CRPCh. 6 - Add syntax diagrams to those in Question 5 of...Ch. 6 - Prob. 44CRPCh. 6 - What code optimization could be performed by a...Ch. 6 - Simplify the following program segment Y = 5 if (Y...Ch. 6 - Simplify the following program segment while (X !=...Ch. 6 - In an object-oriented programming environment, how...Ch. 6 - Describe how inheritance might be used to develop...Ch. 6 - What is the difference between the public and...Ch. 6 - a. Give an example of a situation in which an...Ch. 6 - Describe some objects that might be found in a...Ch. 6 - Prob. 53CRPCh. 6 - Prob. 54CRPCh. 6 - Prob. 55CRPCh. 6 - Prob. 56CRPCh. 6 - Prob. 57CRPCh. 6 - Prob. 58CRPCh. 6 - Prob. 59CRPCh. 6 - In general copyright laws support ownership rights...Ch. 6 - By using a high-level programming language, a...Ch. 6 - Prob. 3SICh. 6 - Prob. 4SICh. 6 - Prob. 5SICh. 6 - Suppose an amateur programmer writes a program for...Ch. 6 - Prob. 7SI
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- For this exercise, we will work on a regular grammar to recognize a comment in a C++ or Java program. A comment starts with /* and ends with */ and anything else in between can be ignored. We won't consider the case of nested comments. Keep in mind that you can have any number of * characters at the beginning, at the end, and in between. • Write a regular grammar recognizing such comments. • Draw the finite state machine for this grammar. • Draw a table for this grammar such as the ones for table-driver scanners in the class notes and in the book.arrow_forwardFor each of the following statements about regular expressions α, β and languages A, B, state whether they are true or false. Provide a one-sentence justification for each answer.arrow_forwardDo not give me irrelevant explanation. I will report it directly right away. True/false?arrow_forward
- Formalize the following sentence in english: Vx. (person(x ) A ay. (like(x,y) ^ food(y) A¬contain(cheese)))arrow_forwardFor each of the following languages, determine whether or not it is context-free. You must justify youranswer. I understand this is a language accepting any a,b words as long as it is a palindrome, and have been using the pumping lemma, but am not sure how to approach it here.arrow_forward1. For each of the following regular expressions find a language (i.e., a set of strings) over A = {a,b,c} that can be represented/described by that expression. a. a*bc + bc* b. b*aaac* а. b.arrow_forward
- DO NOT COPY FROM OTHER WEBSITES Correct and detailed answer will be Upvoted else downvoted. Thank you!arrow_forwardCreate a Deterministic Finite Automaton (DFA) for the language L that is defined over the input alphabet E = {a, b} and has all of the following properties: i. Second and third letters of its words are the same, ii. Its words are longer than four letters, and iii. Its last letter cannot be the letter b. My answer is true or wrong? If it is wrong can you fix it? 96 91 92 a a. 95 9. 96arrow_forwardAnswer the given question with a proper explanation and step-by-step solution. Only answer if you are 100% sure about it. and please draw with pen and paper. please do not copy from anywhere. I will thumbs up if you can do it correctlyarrow_forward
- Logic is used in formal methods. Conceptually, propositional and predicate logic are the most common types of logic. A first-year student in discrete mathematics wants to use propositional and conditional logics to test software. Assist this kid. One idea is to talk about what's good and bad about reasoning and software testing. How should testing of formal programmes be done? Which reason is the best?arrow_forwardFormalize the following sentence in english: aX. elephant(X)| onarrow_forwardLet M be the language over {a, b, c, d, e, f} accepting all strings so that: 1. There are precisely two e's in the string. 2. Every a is immediately followed by an even number of f's. 3. Every c is immediately followed by an odd number of b's. 4. b's and f's don't occur except as provided in rules 2 and 3. 5. All a's occur after the first e. 6. All c's occur before the second e. 7. In between the two e's there are exactly half as many a's as c's. Construct a context-free grammar generating M. You do not need an inductive proof, but you should explain how your construction accounts for each rule. We could eliminate one rule from m to make it regular. Which one? Why?arrow_forward
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