Midterm Exam 1. Give a regular expression that represents the set of strings over Σ = {a‚ b} that contain the substring ab and the substring ba. Solution: a+ b+ a(a ∪ b)∗ ∪ b+ a+ b(a ∪ b)∗ (20 points) 2. Consider the following grammar G: S → SAB|λ A → aA|a B → bB|λ (a) Give a leftmost derivation of abbaab. (b) Build the derivation tree for the derivation in part (1). (c) What is L(G)? Solution: 1 (a) The following is a leftmost derivation of abbaab: S ⇒ SAB ⇒ SABAB ⇒ ABAB
Premium Programming language
Write a regular expression for binary strings with at least two 0s but not consecutive 0s. 1*01+01* Write a regular expression that matches all strings over the alphabet {a‚ b‚ c} that contain: Starts and ends with a a(a*b*c*)a /( a / a(a/b)*a) At most one a b*c*/b*c* a b*c* At least two a’s b*c* a b*c* a b*c* An even number of a’s (b*c* a b*c* a b*c*)+ Number of a’s plus number of b’s is even Write a regular expression to describe all dates of the form
Premium Binary numeral system
The QALMRI Method Explanation of writing a QALMRI The information you are trying to convey in writing your final project is the same as the information you are trying to extract from journal articles that you read. The QALMRI method highlights this important information as: What are the broad and specific questions?‚ what were the alternative hypotheses‚ what was the logic of the design‚ what was the method‚ what were the results‚ what inferences about the specific and broad question can be made
Premium Null hypothesis Color Logic
Homework Zero 0. What do you hope to achieve in this course? I have taken economics courses in the past‚ but was never strong with the math equations. I am excited to improve this weakness of mine. 1. What skills do you bring to the classroom? To your fellow students? Although I was an economics major in undergrad‚ I took many computer classes and as a result am very proficient with computers. I can use these skills when working with classmates as well. 2. How will your classmates
Premium Saint Petersburg Understanding Investment
Regular Expressions This ppt is the work by Dr. Costas Busch‚ used with permission‚ and available from http://csc.lsu.edu/~busch/courses/theorycomp/fall2008/ 1 Regular Expressions Regular expressions describe regular languages Example: (a b c) * describes the language a‚ bc * ‚ a‚ bc‚ aa‚ abc‚ bca‚... 2 Recursive Definition Primitive regular expressions: ‚ ‚ Given regular expressionsr1 r2 and r1 r2 r1 r2 r1 * Are regular expressions r1 3 Examples A regular expression:
Premium
NAME……………………………….. TEST-10TH FORM I.Circle the correct answer: 1.I’m too tired to play tennis today‚I……………………..boxes since morning. a)have packed b)am packing c)have been packing 2.She is an excellent journalist.A top newspaper……………………her an important job. a)has offered b)is offering c)offers 3.Jane can’t come.Her car …………………..down. a)has been breaking b)breaks c)has broken 4.If you don’t study‚you……………….pass your exams. a)won’t
Premium Word Verb Grammatical tense
significant difference in scores between students’ writing with the use of graphic organizers and students’ writing without the use of graphic organizers. One third-grade class was involved in the 6-week study‚ and was given two personal narrative writing assignments. The two writing assignments were each graded using a writing rubric provided by the Georgia Department of Education. Results indicated that the students using the graphic organizers showed an improvement in their creative writing. Good
Premium Concept Concept map Educational psychology
correct? Student: Yes. Dean: Since the basic facts are not in dispute‚ let ’s consider some of the broader issues involved. 1 What would you say was ethically wrong about cheating? Student: Well‚ cheating violates the rules. Dean: But Martin Luther King violated some of the rules of his society. Do you feel his acts of civil disobedience were wrong in an ethical sense? Student: No‚ but I don ’t see the connection. Dean: It ’s a general principle we ’re exploring at this point. Is it your position that
Premium Ethics Morality
REGULAR EXPRESSIONS AND IT’S APPLICATIONS REGULAR EXPRESSIONS A regular expression is a specific pattern that provides concise and flexible means to "match" (specify and recognize) strings of text‚ such as particular characters‚ words‚ or patterns of characters. Common abbreviations for "regular expression” include regex and regexp. It is a Compact mechanism for defining a language. OPERANDS OF REGULAR EXPRESSION The empty string ε Single characters of the underlying
Premium Programming language
Summarise the main development of a child from the age range 0-2‚ 3-5 and 5-8 years The main developments of a child are as follows: Physical Development Intellectual Development Language Development Emotional Development Social Development Here I will summarise the above points: Physical Development 0-2 years The first physical stages in a baby happen after they are born. They will start by learning how to hold their head up. Babies have a grasping reflex which enables them
Premium Developmental psychology Psychology Child development