Glossary U

ultimate component	For a derived type or a structure, a component that is of intrinsic type or has the POINTER attribute, or an ultimate component of a component that is a derived type and does not have the POINTER attribute.
unary operator	An operator that operates on one operand. For example, the minus sign in -A and the .NOT. operator in .NOT. (J .GT. K).
undeferred task	A task for which execution is not deferred with respect to its generating task region; that is, its generating task region is suspended until execution of the undeferred task has finished.
undefined	For a data object, the property of not having a determinate value.
underflow	An error condition occurring when the result of an arithmetic operation yields a result that is smaller than the minimum value in the range of a data type. For example, in unsigned arithmetic, underflow occurs when a result is negative. See also denormalized number.
unformatted data	Data written to a file by using unformatted I/O statements; for example, binary numbers.
unformatted I/O statement	An I/O statement that does not contain format specifiers and therefore does not translate the data being transferred. Contrast with formatted I/O statement.
unformatted record	A record that is transmitted in internal format between internal and external storage.
unit identifier	The identifier that specifies an external unit or internal file. The identifier can be any one of the following: An integer expression whose value must be zero or positive An asterisk (*) that corresponds to the default (or implicit) I/O unit The name of a character scalar memory reference or character array name reference for an internal file Also called a device code, or logical unit number.
unspecified storage unit	A unit of storage for holding a pointer or a scalar that is not a pointer and is of type other than default integer, default character, or default real.
upper bounds	See bounds.
use association	The process by which the entities in a module are made accessible to other scoping units (through a USE statement in the scoping unit).
user-defined assignment	See defined assignment.
user-defined operator	See defined operation.
user-defined type	See derived type.