LR Parsing Tables are a two-dimensional array in which each entry represents an Action or goto entry. A programming language grammar having a large number of productions has a large number of states or items, i.e., I0, I1 … … In.So, due to more states, more Actions & goto entries ... Read More

Problem Statement Consider the ambiguous grammar.E → E + EE → E * EE → (E)E → id(a) Construct LR (0) items for above grammar.(b) Construct SLR parsing table for grammar.(c) Parse the input string id + id * id. ... Read More

Shift Reduce Parser is a type of Bottom-Up Parser. It generates the Parse Tree from Leaves to the Root. In Shift Reduce Parser, the input string will be reduced to the starting symbol. This reduction can be produced by handling the rightmost derivation in reverse, i.e., from starting symbol to ... Read More

SolutionStep1 − Construct Augment Grammar(0) S′ → S(1) S → A a(2) S → b A c(3) S → B c(4) S → b B a(5) A → d(6) B → dStep2 − Find Closure & goto. Construct a set of LR (1) items. Here all the boxes represent new ... Read More

SolutionStep1 − Construct LR (1) Set of items. First of all, all the LR (1) set of items should be generated.In these states, states I3 and I6 can be merged because they have the same core or first component but a different second component of Look Ahead.Similarly, states I4 and ... Read More

LALR Parser is Look Ahead LR Parser. It is intermediate in power between SLR and CLR parser. It is the compaction of CLR Parser, and hence tables obtained in this will be smaller than CLR Parsing Table.Here, first of all, we will construct LR (1) items. Next, we will look ... Read More

SolutionStep1 − Construct Augmented Grammar(0) S′ → S(1) S → CC(2) C → cC(3) C → d.Step2 − Find closure & goto to construct LR (1) itemsApplying goto on I7, I8, I9In I7, I8, I9 we have production C → d ∙, $, c → cC ∙, c | d ... Read More

CLR defines canonical lookahead. CLR parsing use the canonical collection of LR (1) items to construct the CLR (1) parsing table. CLR (1) parsing table makes the more number of states as compare to the SLR (1) parsing. In the CLR (1), it can locate the reduce node only in ... Read More

Description − Consider the GrammarE → E + T|TT → TF|FF → F*|a|b.SolutionStep1 − Construct the augmented grammar and number the productions.(0) E′ → E(1) E → E + T(2) E → T(3) T → TF(4) T → F(5) F → F ∗(6) F → a(7) F → b.Step2 − ... Read More

SolutionStep1 − Construct Augmented Grammar(0) S′ → S(1) S → x A y(2) S → x B y(3) A → q S(4) A → q(5) B → qStep2 − Find Closure & goto functions to construct LR (0) items. Here Boxes represent New States and Circles represent the repeating state.Step3 ... Read More