Explain Recursive Decent Parsing
A top down parsing that executes a set of recursive procedure to process the input without backtracking is called recursive decent parserThere is a procedure for each non terminal in…
Algorithm to left factor a grammar
Left factoring is a grammar transformation that is useful for producing a grammar suitable for predictive parsing. Algorithm to left factor a grammar Input: Grammar G Output: An equivalent left factored grammar.For each…
Algorithm to eliminate left recursion
Algorithm to eliminate left recursionAssign an ordering A1,…,An to the nonterminals of the grammerfor i:=1 to n do beginfor j:=1 to i−1do begin replace each production of the form Ai→Aiɣ by…
Types of Derivations
There are mainly two types of derivations,Leftmost derivationRightmost derivationLet Consider the grammar with the production S->S+S | S-S | S*S | S/S |(S)| aLeft Most DerivationA derivation of a string…
Difference between syntax tree and Parse tree
No.Parse TreeSyntax Tree1Interior nodes are non-terminals, leaves are terminals.Interior nodes are “operators”, leaves are operands.2Rarely constructed as a data structure.When representing a program in a tree structure usually use a…
Algorithm to minimizing the number of states of a DFA
Construct an initial partition Π of the set of states with two groups: the accepting states F and the non-accepting states S – FApply the repartition procedure to Π to…
C program to implement the syntax-directed definition of “if E then S1” and “if E then S1 else S2”
#include #include #include int parsecondition(char[ ],int,char*,int); void gen(char[ ],char[ ],char[ ],int); int main() { int counter=0,stlen=0,elseflag=0; char stmt[60]; char strB[54]; char strS1[50]; char strS2[45]; printf("Format of 'if' statementn example..n"); printf("if(a
Specification of token
Strings and languages Terms for a part of string Term Definition Prefix of S A string obtained by removing zero or more trailing symbol of string S. e.g., ban is…
Explain token & pattern and lexemes
Token: Sequence of character having a collective meaning is known as token. Typical tokens are, 1) Identifiers 2) keywords 3) operators 4) special symbols 5) constants Pattern: The set of…
Role of lexical analysis and its issues
The lexical analyzer is the first phase of compiler. Its main task is to read the input characters and produce as output a sequence of tokens that the parser uses…
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