# Glossary R

random access | See direct access.
rank | The number of dimensions of an array. A scalar has a rank of zero.
rank-one object | A data structure comprising scalar elements with the same data type and organized as a simple linear sequence. See also scalar.
real constant | A constant that is a number written with a decimal point, exponent, or both. It can have single precision (REAL(KIND=4)), double precision (REAL(KIND=8)), or quad precision (REAL(KIND=16)).
record | Can be either of the following: A set of logically related data items (in a file) that is treated as a unit; such a record contains one or more fields. This definition applies to I/O records and items that are declared in a record structure. One or more data items that are grouped in a structure declaration and specified in a RECORD statement.
record access | The method used to store and retrieve records in a file.
record structure declaration | A block of statements that define the fields in a record. The block begins with a STRUCTURE statement and ends with END STRUCTURE. The name of the structure must be specified in a RECORD statement.
record type | The property that determines whether records in a file are all the same length, of varying length, or use other conventions to define where one record ends and another begins.
recursion | Pertains to a subroutine or function that directly or indirectly references itself.
reduction scoping clause | OpenMP* directive clauses that define the region in which a reduction is computed by tasks or Single Instruction Multiple Data (SIMD) instructions.
reference | Can be any of the following: For a data object, the appearance of its name, designator, or associated pointer where the value of the object is required. When an object is referenced, it must be defined. For a procedure, the appearance of its name, operator symbol, or assignment symbol that causes the procedure to be executed. Procedure reference is also called "calling" or "invoking" a procedure. For a module, the appearance of its name in a USE statement.
relational expression | An expression containing one relational operator and two operands of numeric or character type. The result is a value that is true or false. For example, A-C .GE. B+2 or DAY .EQ. 'MONDAY'.
relational operator | The symbols used to express a relational condition or expression. The relational operators are (.EQ., .NE., .LT., .LE., .GT., and .GE.).
relative file organization | A file organization that consists of a series of component positions, called cells, numbered consecutively from 1 to n. Intel Fortran uses these numbered, fixed-length cells to calculate the component's physical position in the file.
relative pathname | A directory path expressed in relation to any directory other than the root directory. Contrast with absolute pathname.
root | On Windows* systems, the top-level directory on a disk drive; it is represented by a backslash (\). For example, C:\ is the root directory for drive C. On Linux* systems, the top-level directory in the file system; it is represented by a slash (/).
routine | A subprogram; a function or procedure. See also function, subroutine, and procedure.
run time | The time during which a computer executes the statements of a program.

Parent topic: Glossary