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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- 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*2What you need to do:1. Type that code up and run it to make sure that it is doing what it is supposed to do. Provide the strings in the header of the program when prompted.2. Use the logic in that program to design your own Recursive Descent parser in C for the following grammar:S →aABA →Abc | bB →d3. Make sure that you choose at least two strings that pass the grammar and one string that does not pass the grammar just like I did in the model program4. Submit both the code and a screen shot of your results for the choice of strings that you provided. Below is the C code that can be used to implement a Recursive Descent parser for the above grammar/* Recursive Descent Parser for the Expression Grammar:S → (L) |aL' →,SL'|εL → SL'Valid inputs: (a,(a,a)) and (a,((a,a),(a,a)))Invalid inputs:(aa,a)*/#include <stdio.h>#include <string.h>int S(), Ldash(), L();char *ip;char string[50];int main() {printf("Enter the string\n");scanf("%s", string);ip =…
- Can someone tell me if this is right please?a. Write a BNF grammar for the language consisting of strings built only of the letters a and b. The strings may have any number of these letters, but the letter combinations bb must be in each string somewhere, and each string must start with a aa. For example, the strings aaabbabbba, aaaababba, and aababbabb are in the language, while a, bba, ababb, aabaa, and bbaa are not. b. Draw the parse tree for string aabbaaba according to the previous grammar: c. Describe, in complete English sentences and “layman’s terms,” the language defined by the following grammar in BNF (start symbol is <S> ): <S>::= <A>a|<B>b <C>::= c <A>::= a<A>a|<C> <B>::= b<B>b|<C>A. Write a Scheme function that returns the number of zeros in a given simple list of numbers.B. Write a Scheme function that returns the reverse of its simple list parameter.C. Write a Scheme predicate function that tests for the structural equality of two given lists. Two lists are structurally equal if they have the same list structure, although their atoms may be different.
- Question 13 Write a function in Scheme or rules in Prolog called countlt that takes a list of numbers, L. and another number. N. and returns the count of numbers less than N in the list L. Example calls Scheme: (countlt '(6 1 9) 4) -> 1 (countlt '(50 27 13) 1) -> 0 Prolog ?- countlt (I6, 1, 91, 4, X) . X = 1. ?- countlt ( [50, 27, 131, 1, X). X = 0. Edit View Insert Format Tools Table 12pt v Paragraph v В I U ※ 总 !!write a Scheme function that would calculate the inner product of two vectors; make sure to test out your function using a pair of vectors of your choosing.What do you mean by "static semantics" in this context? Please share examples of static semantics standards that are difficult to construct using BNF..