automatic generation of lexical analyzer

1. How is lexical analyzer implemented?
2. What are the features of lexical analyzer?
3. Which one is a Lexer generator?
4. Which compiler is used for lexical analysis?
5. What is the output of lexical analyzer?
6. What is lexical error?
7. What does lexical mean?
8. What are the primary tasks of a lexical analyzer?
9. What is meant by lexical analysis?
10. What is the similarity between LR LALR and SLR?
11. What does parsing mean?
12. What is YACC program?

How is lexical analyzer implemented?

Lexical Analysis can be implemented with the Deterministic finite Automata.
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1. Lexical analyzer first read int and finds it to be valid and accepts as token.
2. max is read by it and found to be a valid function name after reading (
3. int is also a token , then again i as another token and finally ;

What are the features of lexical analyzer?

Lexical analyzer performs below given tasks:

• Helps to identify token into the symbol table.
• Removes white spaces and comments from the source program.
• Correlates error messages with the source program.
• Helps you to expands the macros if it is found in the source program.
• Read input characters from the source program.

Which one is a Lexer generator?

8. Which one is a lexer Generator? Explanation: ANTLR – Can generate lexical analyzers and parsers.

Which compiler is used for lexical analysis?

JavaCC is the standard Java compiler-compiler. Unlike the other tools presented in this chapter, JavaCC is a parser and a scanner (lexer) generator in one. JavaCC takes just one input file (called the grammar file), which is then used to create both classes for lexical analysis, as well as for the parser.

What is the output of lexical analyzer?

Question 8 Explanation: Lexical analysis produces a stream of tokens as output, which consists of identifier, keywords,separator,operator, and literals. Consider the following statements related to compiler construction : I. Lexical Analysis is specified by context-free grammars and implemented by pushdown automata.

What is lexical error?

Lexical error is a sequence of characters that does not match the pattern of any token. Lexical phase error is found during the execution of the program.

What does lexical mean?

1 : of or relating to words or the vocabulary of a language as distinguished from its grammar and construction Our language has many lexical borrowings from other languages.

What are the primary tasks of a lexical analyzer?

LEXICAL ANALYZER:

Its main task is to read the input characters and produces output a sequence of tokens that the parser uses for syntax analysis. As in the figure, upon receiving a “get next token” command from the parser the lexical analyzer reads input characters until it can identify the next token.

What is meant by lexical analysis?

In computer science, lexical analysis, lexing or tokenization is the process of converting a sequence of characters (such as in a computer program or web page) into a sequence of tokens (strings with an assigned and thus identified meaning). ...

What is the similarity between LR LALR and SLR?

What is the similarity between LR, LALR and SLR? Explanation: The common grounds of these 3 parser is the algorithm but parsing table is different. Explanation: Error is found when it the input string is scanned. 4.

What does parsing mean?

Parsing, syntax analysis, or syntactic analysis is the process of analyzing a string of symbols, either in natural language, computer languages or data structures, conforming to the rules of a formal grammar. The term parsing comes from Latin pars (orationis), meaning part (of speech).

What is YACC program?

YACC stands for Yet Another Compiler Compiler. YACC provides a tool to produce a parser for a given grammar. YACC is a program designed to compile a LALR (1) grammar. It is used to produce the source code of the syntactic analyzer of the language produced by LALR (1) grammar.