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Flashcards

U4 Flashcards

A Tomalin Computing GCSE Inglês 35 flashcards

Flashcards do conjunto (35)

  1. 1High Level Languages-resembles natural language
    -errors less likely
    -commands perform complex instructions
    -can't be executed by a CPU (translation)
    -best for complex apps where speed is not critical
  2. 2Low Level Languages-uses instruction set of CPU
    -hard to understand/read
    -hard to find errors
    -efficient due to direct execution
    -best for interfacing directly with hardware or when speed/memory use is critical
  3. 3Assemblers-translates assembly to machine code
    -operators and operands replaced by binary equivalents
  4. 4Compilers-translates high level code all at once
    -machine code file can only be executed by compatible computers
    -no source code distribution
    -fast execution
  5. 5Interpriters-translates high level code line by line
    -programs run on any computer
    -easy to find runtime errors
    -source code is distributed
    -slower execution
  6. 6Syntax Errors-text does not match valid syntax
  7. 7Runtime Errors-program tries to perform an impossible operation
  8. 8Logical Error-program does not run as expected
  9. 9Linking Error-program tries to import a function from a nonexistent file
  10. 10Rounding Error-a value is rounded and therefore loses accuracy
  11. 11Truncation Error-data must be truncated (shortened) to fit
    -can result in inaccurate values or missing text
  12. 12Stages Of Compilation OrderLexical Analysis
    Symbol Table Construction
    Syntax Analysis
    Semantic Analysis
    Code Generation
    Code Optimisation
  13. 13Lexical Analysis (SoC)-comments and unneeded spaces are removed
    -keywords, constants and identifiers are replaced by tokens
  14. 14Symbol Table Construction (SoC)-a table is created to hold addresses of variables, labels and subroutines
  15. 15Syntax Analysis (SoC)-tokens are checked to see is they match the expected syntax
    -error messages are produced is errors are found
  16. 16Semantic Analysis (SoC)-variables are checked to see if they're used correctly and the right data types
    -operations are checked to ensure they're legal
  17. 17Code Generation (SoC)-machine code is generated
  18. 18Code Optimisation (SoC)-code can be optimised to make it more efficient, faster or less resource intensive
  19. 19Operating Systems- software interfacing with the hardware of a computer
    -provides common services for other software
  20. 20Managing Peripherals and Printing (OS)- OS does the work of interfacing with different hardware
    -print spoolers queue print jobs until the printer is available
  21. 21Managing Backing Stores and Memory (OS)-backups of important data to external devices/the cloud
    -memory is split into pages for each app
  22. 22Managing Processes and Security (OS)-OS divides up CPU time between multiple processes, allowing multitasking
    -memory paging, user authentications and permissions
  23. 23Providing an Interface (OS)-provides a GUI and/or CLI for easy ue of the system
  24. 24IDEs-software assisting with developing programs
    - includes features like editors and automatic formatting, line numbering and colour coding
  25. 253 typical features of an IDE editor-automatic formatting
    -automatic line numbering
    -automatic colour coding
  26. 26IDEs highlight...-routines and subroutines
    -standard functions
    -syntax errors
  27. 27Loaders infoseparate code files can be organised and leaded
  28. 28Debuggers infosteps through code line by line
  29. 29Error Diagnostics infowhen errors occur, the IDE will attempt to provide support
  30. 30Trace info-a log of user inputs, variable changes and other events
    -helps with finding logic errors
  31. 31Break Points infoexecution pauses at specified points to help with debugging
  32. 32Variable Watch infoshows the contents of every variable in real time as the program runs (or during debugging)
  33. 33Memory Inspector infoshows exact contents of memory locations within the computer
  34. 34Statement Compilation infothe IDE suggests how a statement/function might be written and what variables may be passed to it
  35. 35Code Optimisation infothe IDE suggests changes to the code that make it more efficient

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Descrição
GCSE Computing FlashCards sobre U4 Flashcards, criado por A Tomalin em 08-03-2022.
Criado por
A Tomalin · mar 2022
Atualizado
10 mai 2022
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