c. Write a BNF grammar and a regular expression that describes the structure of US telephone numbers, which can either be (000)000-0000 or 000-0000, where x is a digit from 0 to 9. Grammar Regular expression
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- Chomsky Normal Form: Most useful grammars can be translated into a nor-mal form making answers to questions about the language more transparent.Build a context-free grammar. Use the usual notation to build the grammar that recognizes the FOR loop in the java and python languages. Please ExplainComputer Science
- 24. Suppose that you are defining a grammar for scientific notation numbers. (Ex: "1.3e+5"). What are supposed to be the terminals in this language? (Tip: try to use a float point representation using regular expression).Build a context-free grammar. Use the usual notation to build the grammar that recognizes the FOR loop in the java and python languages.Write a BNF description of the Boolean expressions of Java, including the three operators &&, ||, and ! and the relational expressions.
- Q4. Design a CFG for a prefix expressions with operands x and y and binary operators +, - , and *. Here + is summation, - is subtraction, and * is multiplication. a) Find leftmost and rightmost derivations for the string +*-xyxy. b) Check whether your grammar is ambiguous or not using a parse tree.C++ Consider the language that the following grammar defines: <S> = c | <W> | c<S> <W> = abb|a<W>bb Write all strings that are in this language and that contain seven or fewer characters. If the answer includes multiple strings, you must enter the answers in alphabetical order. A. In alphabetic order, what are the two strings in this language that are 3 characters in length? B. In alphabetic order, what are the two strings in this language that are 4 characters in length? C. In alphabetic order, what are the two strings in this language that are 5 characters in length?1.Write a C++ program to test whether a given digit is valid or not by entering on output your ID to check the validity of the digit and try the non valid digit on output either 2. Write a program in C++ to recognize strings under 'k+', 'km', 'kkm+' and try on output the acceptance of string under the above rules 3. Write a program in C++ to check whether a string belongs to a grammar or not for the following grammar and show the output for both the valid and invalid strings, respectively Y->mNz 4. Write a program in FLEX for implementing a calculator and do the following arithmetic expressions: 99/9/1 5-5*6 7+12/12*2