Computer ProgrammingTypes

Coding Languages

e.g. 2/3, only a few languages have these.

offer fixed point. Precision can usually be freely defined.

Base 10 (human) fixed point, often used for monetary values. Only a few languages

what activities, outside program control, can change the data (hardware, user, system clock)

); what can you not do, such as divide by zero or string manipulation; and what happens if you overflow the buffers to do actions with results falling outside the space allotted

A sequence of characters. Often implemented as Array of Characters.

Some bar coding uses similar concept.

Floating point, most languages offer single and double precision

These are special data types used to support date math, such as calculating number days between two dates.

Width of data is controlled by the content.

Two digits can fit into same space as one character. Look at definition of character set forw:ASCII,w:EBCDIC, or similar conceptual system. Note letters and special characters are represented by two hexadecimal half bytes so with packed data, two digits can fit in same space as one letter. Usually one half byte is reserved for numeric sign (plus or minus).

They contain value like True / False or Yes / No. They are often used to recognize use of a keyboard function (which special keys got pressed); printer condition (ready for a new page); file access (we got the record we were looking for, were now at end-of-file). These special conditions mean that special actions needed.

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Some nations and cultures alphabets (such as Chinese, Japanese, Korean, Russian (Cyrillic)) can use graphical characters called ideograms to perform a role similar to the letters A to Z in western nations languages when constructing meanings, except each ideogram carries more meaning than each A to Z letter. Data types are available to store these graphical character sets, which contain more symbols than can be represented by the 256 combinations found in traditional western character sets, thus a double byte character set (DBCS) exists to account for every combination.

An assorted combination of primitive types.

what can you do with the data type (the

There are a few basic data types seen in some programming languages:

determine the kinds of values and how they can be used in the given programming environment. In most cases, a programming language defines a set of basic data types, e.g. for numbers, characters or strings. In higher languages, it is often possible to define new data types from the existing ones, for example, to represent a postal address (consisting of strings for street and city and integers for the postal code). When communicating data between different programs and computer systems it is important to either use types that both can recognize, or have a means of translating between them.

A character, usually of 8, 16 or 32 bit size. Some Characters sets, like UTF-8 are for a variable length.

Base 16 available onIBMSystems. Digits are zero through F. Most modern languages dont need a separate Hexadecimal type, they use integers and specialized I/O routines.

This page was last edited on 10 July 2017, at 20:15.

DBCS Double Byte Character Set

A complete definition of a data type consists of up to three things:

Unlimited in some languages, limited to 8-bit, 16-bit, 32-bit, 48-bit, 64-bit sizes in most languages

Haskell/Type basics- the language Haskell is often used as a platform for programming language researchers to develop new, advanced type systems. This wikibook could give you insight into what types might look like in the near future for the common programmer. (Note: see also the advanced section of theHaskellwikibook)

have these. In Object Oriented languages often implemented by a library

Some special fonts use a similar system.

A complex value usually consisting of two Float values. Only a few languages

In addition to data blank or zero, we can have null value, meaning we not yet know what belongs there.

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