#ELEMENT DEFINITION COMPUTER SCIENCE PLUS#

In reference to computer systems, attributes are defined particularly for read or write attributes for specific read or write.

#ELEMENT DEFINITION COMPUTER SCIENCE PLUS#

A circle object can be defined in similar attributes plus an origin and radius. Similarly, a programming language does not use the same operations to evaluate a floating point typed number and typed long integers.įor example, in computer graphics, line objects can have attributes such as thickness (with real values), color (with descriptive values such as brown or green or values defined in a certain color model, such as RGB), dashing attributes, etc.

Picture file formats (for example JPEG, PNG and BMP) are not decoded using the same operations (however similar the images look - these are all graphics data formats). 'division by zero is not to be tolerated') are all potentially involved in defining an attribute, or conversely one may view them as attributes of that object's type.

Data types: It follows that an object definition can be extended by imposing data typing which can consist of a representation format, a default value, and legal operations (rules) and restrictions (e.g.

Neither does one process text as if it was type of floating point ( decimal numbers).

Rules: Each named attribute has an associated set of rules called operations: For example, one doesn't sum characters or manipulate and process an integer array the same way as an image object.

For an element these can be a type and class name, while for a file these can be a name and an extension, respectively. An attribute of an object usually consists of a name and a value. However, in actual usage, the term attribute can and is often treated as equivalent to a property depending on the technology being discussed. An attribute is frequently and generally a property of a property.

For clarity, attributes should more correctly be considered metadata. It may also refer to or set the specific value for a given instance of such. In computing, an attribute is a specification that defines a property of an object, element, or file.

The constructor and selector together implement the quiz item abstract data type.An attribute in a relational database can be represented as a column or field The and blocks are the selectors they each select one piece of the data structure. By naming the pieces of the structure, the constructor makes it certain that every time you use it, you build the structure in the right order. The block is the constructor it constructs one example of the data structure. This is an abstraction because it hides the details inside the constructor and selectors so that the programmer who uses a quiz item has to think only about questions and answers, not about list indices. It's not built into the language you develop it as you code. Īn abstract data type (ADT) is a custom data type that's meaningful to your program.ADTs are things that you, the programmer, create to make your program easier for you and others to read, debug, and improve. The word 'abstract' is often used casually to mean something harder to understand or more complex, but in computer science, its meaning is almost the opposite.

Element definition computer science