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Glossary U
ultimate component  |  
     For a derived type or a structure, a component that is of intrinsic type or has the ALLOCATABLE or POINTER attribute, or an ultimate component of a component that is a derived type and does not have the ALLOCATABLE or 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 subnormal 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: 
 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.  |