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- halftone
- The reproduction of continuous-tone artwork, such as a
photograph, by converting the image into dots of various
sizes.
- hash function
- A function that determines which category, or bucket, to
put an element in. A hash function is needed when
implementing a hash table.
- hash table
- A data structure that divides all elements into
(preferably) equal-sized categories, or buckets, to allow
quick access to the elements. The hash function
determines which bucket an element belongs in.
- header file
- A text file that is used by a group of functions,
programs, or users. It can contain system-defined control
information or user data, and generally consists of
declarations. See include
file.
- heap
- An unordered flat collection that allows duplicate
elements. See key bag.
- heap storage
- An area of storage used for allocation of storage whose
lifetime is not related to the execution of the current
routine. The heap consists of the initial heap segment
and zero or more increments.
- height of a tree
- The length of the longest path from the root to a leaf.
- hexadecimal
- A system of numbers to the base 16. Hexadecimal digits
range from 0 through 9 and A through F.
- hexadecimal constant
- A constant, usually starting with special characters,
that contains only hexadecimal digits. Three examples of
the hexadecimal constant with value 0 are '\x00', '0x0',
and '0X00'.
- hierarchy
- See class hierarchy.
- high-performance
file system (HPFS)
- In the OS/2 operating system, an installable file system
that uses high-speed buffer storage, known as a cache, to
provide fast access to large disk volumes. File names
used with the HPFS can have as many as 254 characters.
- hit testing
- The means of identifying which graphic object the mouse
is pointing to.
- host
- The main computer in a distributed processing
environment.
- HPFS
- See high-performance
file system.
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