Flashcards
3.1.3 Data Representation, Structure and Management
Flashcards do conjunto (9)
- 1Can you use Binary, Octal, Hexadecimal and BCD?Yep
- 2Add you add and subtract Binary and use Two's Complement?Yep
- 3Do you know what ASCII, EBCDIC and UNICODE is?A character set is a table of Alphabetical (alpha) characters showing their numeric equivalent.
(A= 65 in ASCII)
One character requires one byte of memory
Represents a total of 128 characters - 4What is Optical Mark Recognition?Shaded boxes are used to provide information. The position of the shading is what’s important – think of a National Lottery ticket
- 5What is Optical Character Reading?Shapes of individual text characters are read and compared to standard shapes from the computer’s memory.
- 6What is Magnetic Ink Character Recognition ?Characters are printed in magnetic ink to allow them to be read by computers at a later date. Magnetic ink helps improve accuracy of reading – MICR can be found in passports.
- 7What is Verification?Verification means checking the input data with the original data to make sure that there have been no
transcription errors. - 8What is Validation?Validation is a check on DATA INPUT to the system by comparing the data input with a set of rules that the
computer has been told the data must follow. Validation is carried out by the computer system itself, using rules about what type of data to expect. - 9What are the 7 Validation rules/checks?Range
Character
Format
Length
Existence
Presence
Check Digit
Informações
- Descrição
- A Level Computing (F451) FlashCards sobre 3.1.3 Data Representation, Structure and Management, criado por Molly Hills em 30-11-2014.
- Criado por
- Molly Hills
- Visualizações
- 27
- Tags
- Avaliação