Lexical Error Detected By The Scanner
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An Error That The Compiler Can Neither Catch Nor Easily Generate Code To Catch
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What Is A Lexical Error
helping each other. Join them; it only takes a minute: Sign up Types of Errors during Compilation and at Runtime up vote 1 down vote favorite I have this question in a homework assignment for my Computer undefined behavior java Languages class. I'm trying to figure out what each one means, but I'm getting stuck. Errors in a computer program can be classified according to when they are detected and, if they are detected at compile time, what part of the compiler detects them. Using your favorite programming language, give an example of: (a) A lexical error, detected by the scanner. (b) A syntax error, detected by the parser. (c) A static semantic error, detected (at in your local implementation of c what is the limit on the size of integers compile-time) by semantic analysis. (d) A dynamic semantic error, detected (at run-time) by code generated by the compiler. For (a), I think this is would be correct: int char foo; For (b), int foo (no semicolon) For (c) and (d), I'm not sure what is being asked. Thanks for the help. language-agnostic programming-languages share|improve this question asked Sep 9 '10 at 3:42 Reti 3193719 add a comment| 2 Answers 2 active oldest votes up vote 3 down vote I'll give it a shot. Here's what I think: a. int foo+; (foo+ is an invalid identifier because + is not a valid char in identifiers) b. foo int; (Syntax error is any error where the syntax is invalid - either due to misplacement of words, bad spelling, missing semicolons etc.) c. Static semantic error are logical errors. for e.g passing float as index of an array - arr[1.5] should be a SSE. d. I think exceptions like NullReferenceException might be an example of DME. Not completely sure but in covariant returns that raise an exception at compile time (in some languages) might also come in this category. Also, passing the wrong type of object in another object (like passing a Cat in a Person object at runtime might qualify for DME.) Simplest example would be trying to access an index that is out of bounds of th
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Static Semantic Error
ADVICE SCHOLARSHIPS Chegg home Books Study Tutors Test Prep Internships Colleges Home home / study / engineering / computer science / questions and answers / csci 3370: programming languages 1. errors in a ... Question: CSCI 3370: Programming Languages 1. Errors in a co... CSCI 3370: Programming Languages 1. Errors in a computer program can be classified according to when they are detected and, if they are detected at compile time, what part of the compiler http://stackoverflow.com/questions/3673616/types-of-errors-during-compilation-and-at-runtime detects them. Using your favorite imperative language, give an example of each of the following. a. A lexical error, detected by the scanner b. A syntax error, detected by the parser c. A static semantic error, detected by semantic analysis d. A dynamic semantic error, detected by code generated by the compiler e. An error that the compiler can neither catch nor easily generate code to catch (this should be a violation of the language definition, http://www.chegg.com/homework-help/questions-and-answers/csci-3370-programming-languages-1-errors-computer-program-classified-according-detected-de-q7104191 not just a program bug) (Use the same language for parts (a)-(d). You may use a different language for part (e) -- this part could be challenging in Java, for example.) 2. In your local implementation of C, what is the limit on the size of integers (describe how you found the answer)? What happens in the event of arithmetic overflow? What are the implications of size limits on the portability of programs from one machine/compiler to another? Find out how the answers differ to these questions for any one of the following languages: Java, Ada, Pascal or Scheme? 3. Indicate the binding time (e.g., when the language is designed, when the program is linked, when the program starts execution, etc.,) for each of the following decisions in your favorite programming language and implementation. Explain any answers you think are open to interpretation. o The number of built-in functions (abs, cosine, etc.). o The variable declaration that corresponds to a particular variable reference (say, its use in an expression). o The maximum length allowed for a constant (literal) character string. o The referencing environment for a subroutine that is passed as a parameter o The address of a particular library routine. o The total amount of space occupied by program code and data. 4. Give two conceptually different concrete examples drawn from programming languages with which
scanner. (Hint: is there a symbol on the keyboard that has no https://sites.google.com/a/lclark.edu/drake/courses/pls/assignment-3 meaning in Java?) A syntax error, detected by the parser. A static semantic error, detected by semantic analysis. A dynamic semantic error, detected by code generated by the compiler.Do exercise 2.1f (only part f!) on p. lexical error 103. To avoid confusion with the Kleene *, use # as the anti-fraud character. To ensure that your grammar is regular, do not use any recursive productions. Where does your pet language fit into the classification scheme lexical error detected in Figure 1.1? If it is "multiparadigm", does it lean toward one category more strongly than others? Is your pet language usually compiled, interpreted, or some combination thereof? (Java is compiled into Java bytecode, which is then interpreted by the Java Virtual Machine. Some JVMs include just-in-time compilers which compile to machine language just before the program is run.) Implement and run the GCD algorithm (p. 13) in your pet language. Show your code. (You should write this one yourself, not find a solution on the web.)What to Hand In:All of the above, in a single Google word processing document a3. Sign in|Recent Site Activity|Report Abuse|Print Page|Powered By Google Sites
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