Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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For the following grammar given below, remove left recursion from it:
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- Rewrite the grammar below to eliminate left recursion.S-> S + A | AA -> A * B | BB -> (S) | idarrow_forward1. Draw neat labeled diagrams Eliminate the left recursion of the following grammar. S->(x)/x L->L,S/Sarrow_forwardHere's the code: /* 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 = string;printf("\n\nInput\t\tAction\n ------------------------------\n");if (S()){printf("\n------------------------------------------------\n");printf("\n String is successfully parsed\n");}else{printf("\n ------------------------------------------------\n");printf("Error in parsing string\n");}}int L(){printf("%s\t\tL →SL' \n", ip);if (S()){if (Ldash()){return 1;}elsereturn 0;} elsereturn 0;}int Ldash(){if (*ip == ','){printf("%s\t\tL' →, SL' \n", ip);ip++;if (S()){if (Ldash()){return 1;}elsereturn 0;}else return 0;}else{printf("%s\t\tL' →ε \n", ip);return 1;}}int S(){if (*ip == '('){ printf("%s\t\tS →(L)…arrow_forward
- part 4 and 5arrow_forwardWhich of the following is true about bottom-up parsers? a.Input is processed from right to left b.Grammar must be free of left recursion c.Left recursion is not a problem d.Input is processed left to right in reverse orderarrow_forwardWhy do compilers employ parsing techniques that only work with a subset of all grammars?arrow_forward
- Perform left recursive omission in the following grammar:arrow_forwardCreate an NPDA for the following language:On summation = {0.1}Language 1 (L1) every string in the language begin and end with 1Language 2 (L2) all strings in the language begin with 001The union of L1 and L2arrow_forwardThe following is a grammar for JH-Lisp 2.1, modified version of the language you encountered in homework 4, with slightly different syntax, and expanded set of functions. It uses underscores rather than spaces, square brackets rather than paren- theses, and words as function names instead of symbolic operators. S →[O E E] E →[O E E]|N N →0|1|2|3|4|5|6|7|8|9|NN O →add|sub|mul|div|mod|shl|shr Create a PDA that recognizes JH-Lisp 2.1.arrow_forward
- I need help developing a parser that can take a sentence generated by the context-free grammar and parse it into a parse tree, which can be used to represent the structure of the sentence. Like the example givenarrow_forwardThe following given grammar is a left recursive grammar S Sbab balb The language generated by this grammar is of the following form: L= { ba(bab), b(bab)" | m,ne N} This left recursive grammar can be transformed to a right recursive grammar as follows: S → T -> This right recursive grammar is an LL( ) grammar.arrow_forward*Theory of Computation* Question: Give a formal description of the grammar PY. You may assume that the given rules are in a set called RULES Use the last picture to write a formal descriptionarrow_forward
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