Give a regular expression that generates C
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Give a regular expression that generates C
In certain programming languages, comments appear between delimiters such...
In certain programming languages, comments appear between delimiters such as (# and #). A comment must...
In certain programming languages, comments appear between delimiters such as (# and #). A comment must begin with (# and end with #). A comment may not contain #) inside the comment. A comment's delimiters must be separate: (##) is a comment, (#) is not. • For simplicity, assume that the alphabet is £ = {a,b,( ), #}. Give a regular expression that accepts comments.
Programming Languages Final Exam Name: Question 1 (15 points) Give a regular expression for each of...
Programming Languages Final Exam Name: Question 1 (15 points) Give a regular expression for each of the following languages over = {0,1,2). 1. All strings that begin with 1 and end with 2. 2. All strings that contain exactly three 1's. For example, "0101012" is valid. 3. All strings in which the digits are non-decreasing. For example, "002" is valid, but "102" is not.
(a) Give 2 strings that are members of language specified by the regular expression (0+ 1)∗...
(a) Give 2 strings that are members of language specified by the regular expression (0+ 1)∗ but are not members of the language specified by 0∗ + 1∗ . Then give 2 strings that are members of both languages. Assume the alphabet is Σ = {0, 1}. (b) For each of the following languages specified by regular expressions, give 2 strings that are members and 2 strings that are not members (a total of 4 strings for each part). Assume...
For each of the languages listed below, give a regular expression that generates the lan- guage....
For each of the languages listed below, give a regular expression that generates the lan- guage. Briefly justify your answer. (a) The set of strings over (a, b such that any a in the string is followed by an odd number of b's. Examples: bbbab E L, but abb f L. (b) The set of strings over fa, b in which there is an a in every even position and the total number of b's is odd, where the first...
1. (Decidable languages) (c) (Prefix of a generated string) A string w is called a prefix...
1. (Decidable languages) (c) (Prefix of a generated string) A string w is called a prefix of string s if s starts with w. i. Give a regular expression for all strings over alphabet Σ for which w is a prefix. ii. Let L = {(G, w) | G is a CFG, w is a string, and w is a prefix of some string s generated by G}.
In certain programming languages, comments appear between delimiters such as (# and #). A comment must begin with (# and end with #). A comment may not contain #) inside the comment. A comment's delimiters must be separate: (##) is a comment, (#) is not. • For simplicity, assume that the alphabet is £ = {a,b,( ), #}. Give a regular expression that accepts comments.
Programming Languages Final Exam Name: Question 1 (15 points) Give a regular expression for each of the following languages over = {0,1,2). 1. All strings that begin with 1 and end with 2. 2. All strings that contain exactly three 1's. For example, "0101012" is valid. 3. All strings in which the digits are non-decreasing. For example, "002" is valid, but "102" is not.
For each of the languages listed below, give a regular expression that generates the lan- guage. Briefly justify your answer. (a) The set of strings over (a, b such that any a in the string is followed by an odd number of b's. Examples: bbbab E L, but abb f L. (b) The set of strings over fa, b in which there is an a in every even position and the total number of b's is odd, where the first...
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