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Asked in Computers, Psychology
Difference between lexical and semantic analysis?
Lexical analysis breaks the source code text into small pieces called tokens. Semantic analysis is the phase in which the compiler adds semantic information to the parse tree and builds the symbol table. Source: http://en.wikipedia.org/wiki/Semantic_analysis_%28compilers%29#Front_end ...
Asked in C Programming
1. What are three reasons why syntax analyzers are based on grammars?
Simplicity-Techniques for lexical analysis are less complex than those required for syntax analysis, so the lexical-analysis process can be sim- pler if it is separate. Also, removing the low-level details of lexical analy- sis from the syntax analyzer makes the syntax analyzer both smaller and less complex. Efficiency-Although it pays to optimize the lexical analyzer, because lexical analysis requires a significant portion of total compilation time, it is not fruitful to optimize the syntax analyzer. Separation facilitates this selective optimization. Portability-Because the lexical analyzer...
Asked in Computer Programming
Describe how lexical analyzer generators are used to translate regular expressions into deterministic finite automata?
Lexical analyzer generators translate regular expressions (the lexical analyzer definition) into finite automata (the lexical analyzer). For example, a lexical analyzer definition may specify a number of regular expressions describing different lexical forms (integer, string, identifier, comment, etc.). The lexical analyzer generator would then translate that definition into a program module that can use the deterministic finite automata to analyze text and split it into lexemes (tokens). ...
Asked in Verbs
Importance of lexical verb in sentences?
A lexical verb is the main verb of the sentence. All verbs include a lexical verb. A lexical verb does not require an auxiliary verb, but an auxiliary verb exists only to help a lexical verb. It cannot exist alone. A lexical verb is a verb that provides information. The opposite of lexical verbs are auxiliary verbs, which provide grammatical structure. Lexical verbs are an open class type of verb and are used to express states and actions. Such verbs are also known...
What are the names of tools used for fast implimentation of phases of compiler?
Lex and Yacc are two tools that are used to implement the first stages of compilation: tokenization (lexical analysis) and parsing. Free and Open Source versions of these tools are available called Flex and Bison. ...
What are importance of auxiliary and lexical verbs in sentence?
The importance of a lexical verb in a sentence is that it is the main verb of the sentence. An auxiliary verb is there to define the lexical verb. ...
What is lexical impossibility in deconstruction literature?
It is when deconstructing literature becomes so diverse that it is coined "lexical impossibility". It is when deconstructing literature becomes so diverse that it is coined "lexical impossibility". ...
Asked in Computer Programming
Why lexical analyzer known as scanner?
lexical analysis involves scanning the program to be compiled and recognizing the tokens that make up the source statements .Scanners are usually designed to recognize keywords ,operators,and identifiers as well as integers,floating point numbers,character strings etc.....so they are known as scanners ...
Asked in Computer Programming, Computer Science
What is lexical analysis?
A compiler is usually divided into different phases. The input to the compiler is the source program and the output is a target program. Lexical analyzer is the first phase of a compiler which gets source program as input. It scans the source program from left to right and produces tokens as output. A token can be seen as a sequence of characters having a collective meaning. Lexical analyzer also called by names like scanner, linear analyzer etc. ...
Asked in Computer Programming, English Language
What is lexical inconsistency?
Lexical refers to the "lexicon" or the kinds of words specific to a certain specialty or field. Think of it as slang or jargon, if you have a lexical inconsistency, the term you use in one specialty doesn't translate to other disciplines. ...