Question: 3. Regular Expression for Simple Identifiers Consider a programming language which specifies the set of legal identifiers allowed in a valid program as follows: Each

3. Regular Expression for Simple Identifiers

Consider a programming language which specifies the set of legal identifiers allowed in a valid program as follows:

Each identifier start with either a #, , (underscore) or an @.

After the first character, each identifier contains any sequence of lower case alpha- betic characters. There must be at least one such character.

Finally the last character must be a $. Let Lident be the language of all possible legal identifiers. Specify the alphabet, , associ- ated with Lident. Give a Regular Expression which characterizes Lident.

4. Context Free Grammar for Simple Identifiers

Write a Context Free Grammar (using BNF notation) for the Simple Identifiers described in the previous problem.

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!

This question involves the use of AGGREGATE linear PYTHOIN regression on the Auto data set. (a) Perform a simple linear regression with mpg as the response and horsepower as the predictor. Describe...

DETAILS What is the maximum segment length of a 100Base-FX netdwork, The last character ('X', etc) refers to the line code method used. Line code is a patdtern of voltage, current or photons used to...

answer all questions promptly What is the maximum segment length of a 100Base-FX netdwork,Thelast character('X', etc) refers to the line code method used. Line code is a pattern of voltage, current...

io (a) Give the general formula for estimating transition probabilities from training data. Provide the full transition matrix A for this HMM based on the training data shown. [6 marks] (b) Give the...

Let r and s be solutions to the quadratic equation x 2 b x + c = 0. For n N, define d0 = 0 d1 = r s dn = b dn1 c dn2 (n 2) Prove that dn = r n s n for all n N. [4 marks] (b) Recall that a commutative...

1411116 - Programming I Assignment #3 Due Date: November 30, 2016 Submission Instructions: Submit your assignment on the blackboard link, corresponding to your Section: Please follow the following...

Let A, B be sets. Define: (a) the Cartesian product (A B) (b) the set of relations R between A and B (c) the identity relation A on the set A [3 marks] Suppose S, T are relations between A and B, and...

1. (10pt) Write a regular expression that represents each of the following two sets: (1) C strings, which are all strings that: - start and end with double quotes: ". - do not contain double quotes...

re Regular Languages and Finite Automata (a) Let L be the set of all strings over the alphabet {a, b} that end in a and do not contain the substring bb. Describe a deterministic finite automaton...

Data on fifth-grade test scores (reading and mathematics) for 420 school districts in California yield = 646.2 and standard deviation sY = 19.5. (a) Construct a 95% confidence interval for the mean...

Fully charged Limited produces solar power bank chargers. The regular selling price is R400 per unit. The variable cost of goods sold amounts to R 290 and normal monthly production is 2.000 chargers....

2 Natural Foods sells Takeoff, a breakfast cereal, in onepound boxes. According to Food and Drug Administration (FDA) regulations, a one-pound box must contain at least 15.5 ounces of cereal....

please dont use chat gpt or other AI b . 2 9 6 .

What is the difference between Needs and GAP Analyses?

What are ERP suites? Are HCMSs part of ERPs?

An economy is operating with output $400 billion below its natural rate, and fiscal policymakers want to close this recessionary gap. The central bank agrees to adjust the money supply to hold the...