XL Fortran Enterprise Edition for AIX : User's Guide - IBM

D
data object.
constant.
A variable, constant, or subobject of a
data striping. Spreading data across multiple storage
devices so that I/O operations can be performed in
parallel for better performance. Also known as disk
striping.
data transfer statement.
statement.
A READ, WRITE, or PRINT
data type. The properties and internal representation
that characterize data and functions. The intrinsic types
are integer, real, complex, logical, and character. See
also intrinsic.
debug line. Allowed only for fixed source form, a line
containing source code that is to be used for
debugging. Debug lines are defined by a D or X in
column 1. The handling of debug lines is controlled by
the -qdlines and -qxlines compiler options.
default initialization. The initialization of an object
with a value specified as part of a derived type
definition.
definable variable. A variable whose value can be
changed by the appearance of its name or designator
on the left of an assignment statement.
delimiters. A pair of parentheses or slashes (or both)
used to enclose syntactic lists.
denormalized number. An IEEE number with a very
small absolute value and lowered precision. A
denormalized number is represented by a zero
exponent and a non-zero fraction.
derived type. A type whose data have components,
each of which is either of intrinsic type or of another
derived type.
digit. A character that represents a nonnegative
integer. For example, any of the numerals from 0
through 9.
directive. A type of comment that provides
instructions and information to the compiler.
disk striping.
See data striping.
DO loop. A range of statements invoked repetitively
by a DO statement.
DO variable. A variable, specified in a DO statement,
that is initialized or incremented prior to each
occurrence of the statement or statements within a DO
range. It is used to control the number of times the
statements within the range are executed.
DOUBLE PRECISION constant. A constant of type
real with twice the precision of the default real
precision.
dummy argument. An entity whose name appears in
the parenthesized list following the procedure name in
a FUNCTION, SUBROUTINE, ENTRY, or statement
function statement.
dynamic dimensioning. The process of re-evaluating
the bounds of an array each time the array is
referenced.
dynamic extent. For a directive, the lexical extent of
the directive and all subprograms called from within
the lexical extent.
E
edit descriptor. An abreviated keyword that controls
the formatting of integer, real, or complex data.
elemental. Pertaining to an intrinsic operation,
procedure or assignment that is applied independently
to elements of an array or corresponding elements of a
set of conformable arrays and scalars.
embedded blank.
other characters.
A blank that is surrounded by any
entity. A general term for any of the following: a
program unit, procedure, operator, interface block,
common block, external unit, statement function, type,
named variable, expression, component of a structure,
named constant, statement label, construct, or namelist
group.
environment variable. A variable that describes the
operating environment of the process.
executable program. A program that can be executed
as a self-contained procedure. It consists of a main
program and, optionally, modules, subprograms and
non-Fortran external procedures.
executable statement. A statement that causes an
action to be taken by the program; for example, to
perform a calculation, test conditions, or alter normal
sequential execution.
explicit initialization. The initialization of an object
with a value stated in a data statement initial value list,
block data program unit, type declaration statement, or
array constructor.
explicit interface. For a procedure referenced in a
scoping unit, the property of being an internal
procedure, module procedure, intrinsic procedure,
external procedure that has an interface block, recursive
procedure reference in its own scoping unit, or dummy
procedure that has an interface block.
Glossary 433