ELEMENTAL Keyword: Asserts that a user-defined procedure is defined on scalar arguments that may be called with array arguments. An elemental procedure may be a pure procedure or an impure procedure. An elemental procedure is an elemental intrinsic procedure, an intrinsic module procedure that is specified to be elemental, a user-defined procedure that is specified to be elemental, or a type-bound procedure that is bound to an elemental procedure. A procedure pointer or a dummy procedure can not be specified to be elemental.
ELSE Directive Statement: Marks an optional branch in an IF Directive Construct.
ELSE Statement Statement: Marks an optional branch in an IF Construct.
ELSEIF Directive Statement: Marks an optional branch in an IF Directive Construct.
ELSE IF Statement: Marks an optional branch in an IF Construct.
ELSE WHERE Statement: Marks the beginning of an ELSE WHERE block within a WHERE construct.
ENCODE Statement: Translates data from internal (binary) form to character form. It is comparable to using internal files in formatted sequential WRITE statements.
END Statement: Marks the end of a program unit. It takes one of the following forms:
END DO Statement: Marks the end of a DO or DO WHILE loop.
ENDIF Directive Statement: Marks the end of an IF Directive Construct.
END IF Statement: Marks the end of an IF Construct.
ENDFILE Statement: For sequential files, writes an end-of-file record to the file and positions the file after this record (the terminal point). For direct access files, truncates the file after the current record.
END FORALL Statement: Marks the end of a FORALL construct. The FORALL construct is an obsolescent language feature in Fortran 2018.
END INTERFACE Statement: Marks the end of an INTERFACE block.
END TYPE Statement: Specifies the end of a derived type TYPE statement.
END WHERE Statement: Marks the end of a WHERE construct.
ENTRY Statement: Provides one or more entry points within a subprogram. It is not executable and must precede any CONTAINS statement (if any) within the subprogram.
EOF Inquiry Intrinsic Function (Generic): Checks whether a file is at or beyond the end-of-file record.
EOSHIFT Transformational Intrinsic Function (Generic): Performs an end-off shift on a rank-one array, or performs end-off shifts on all the complete rank-one sections along a given dimension of an array of rank two or greater. Elements are shifted off at one end of a section and copies of a boundary value are filled in at the other end. Different sections can have different boundary values and can be shifted by different amounts and in different directions.
EPSILON Inquiry Intrinsic Function (Generic): Returns a positive model number that is almost negligible compared to unity in the model representing real numbers.
EQUIVALENCE Statement: Specifies that a storage area is shared by two or more objects in a program unit. This causes total or partial storage association of the objects that share the storage area. EQUIVALENCE is an obsolescent language feature in Standard Fortran.
ERF Elemental Intrinsic Function (Generic): Returns the error function of an argument.
ERFC Elemental Intrinsic Function (Generic): Returns the complementary error function of an argument.
ERFC_SCALED Elemental Intrinsic Function (Generic): Returns the scaled complementary error function of an argument.
ERRSNS Intrinsic Subroutine (Generic): Returns information about the most recently detected I/O system error condition. Intrinsic subroutines cannot be passed as actual arguments.
ESTABLISHQQ Portability Function: Lets you specify a function to handle errors detected by the Run-Time Library (RTL). It lets you take appropriate steps in addition to the RTL's error-handling behavior, or it lets you replace that behavior.
ETIME Portability Function: On single processor systems, returns the elapsed CPU time, in seconds, of the process that calls it. On multi-core or multi-processor systems, returns the elapsed wall-clock time, in seconds.
EVENT POST and EVENT WAIT Statements: The EVENT POST statement allows an image to notify another image that it can proceed to work on tasks that use common resources. The EVENT WAIT statement allows an image to wait on events posted by other images. They take the following forms:
EVENT_QUERY Intrinsic Subroutine (Generic): Queries the event count of an event variable.
EXIT Statement Statement: Terminates execution of a DO loop or a named construct.
EXIT Subroutine Intrinsic Subroutine (Generic): Terminates program execution, closes all files, and returns control to the operating system. Intrinsic subroutines cannot be passed as actual arguments.
EXP Elemental Intrinsic Function (Generic): Computes an exponential value.
EXP10 Elemental Intrinsic Function (Generic): Computes a base 10 exponential value.
EXPONENT Elemental Intrinsic Function (Generic): Returns the exponent part of the argument when represented as a model number.
EXTENDS_TYPE_OF Inquiry Intrinsic Function (Generic): Inquires whether the dynamic type of an object is an extension type of the dynamic type of another object.
EXTERNAL Statement and Attribute: Allows an external procedure, a dummy procedure, a procedure pointer, or a block data subprogram to be used as an actual argument. (To specify intrinsic procedures as actual arguments, use the INTRINSIC attribute.)
FAIL IMAGE Statement: Causes the image that executes it to stop participating in program execution, without initiating termination.
FAILED_IMAGES Transformational Intrinsic Function (Generic): Returns an array of index images that have failed.
FDATE Portability Function and Subroutine: Returns the current date and time as an ASCII string.
FGETC Portability Function: Reads the next available character from a file specified by a Fortran unit number.
FINAL Clause Parallel Directive Clause: Specifies that the generated task will be a final task.
FINAL Statement Statement: Denotes a finalization procedure that defines one or more final subroutines that are bound to a derived type.
FIND Statement: Positions a direct access file at a particular record and sets the associated variable of the file to that record number. It is comparable to a direct access READ statement with no I/O list, and it can open an existing file. No data transfer takes place.
FINDLOC Transformational Intrinsic Function (Generic): Finds the location of a specified value in an array.
FINDFILEQQ Portability Function: Searches for a specified file in the directories listed in the path contained in the environment variable.
FIRSTPRIVATE Parallel Directive Clause: Provides a superset of the functionality provided by the PRIVATE clause. It declares one or more variables to be private to each thread in a team, and initializes each of them with the value of the corresponding original variable.
FIXEDFORMLINESIZE General Compiler Directive: Sets the line length for fixed-form Fortran source code.
FLOAT Elemental Intrinsic Function (Generic): Converts an integer to REAL(4).
FLOOR Elemental Intrinsic Function (Generic): Returns the greatest integer less than or equal to its argument.
FLUSH Directive OpenMP* Fortran Compiler Directive: Identifies synchronization points at which the threads in a team must provide a consistent view of memory.
FLUSH Statement Statement: Causes data written to a file to become available to other processes or causes data written to a file outside of Fortran to be accessible to a READ statement. It takes one of the following forms:
FLUSH Subroutine Portability Subroutine: Flushes the contents of an external unit buffer into its associated file.
FMA and NOFMA General Compiler Directives: Tells the compiler to allow generation of fused multiply-add (FMA) instructions, also known as floating-point contractions. NOFMA disables the generation of FMA instructions.
FOR__SET_FTN_ALLOC Run-Time Function: Lets you specify your own routine to dynamically allocate common blocks. This function is especially useful when you are sharing libraries.
FOR_GET_FPE Run-Time Function: Returns the current settings of floating-point exception flags. This routine can be called from a C or Fortran program.
FOR_IFCORE_VERSION Portability Function: Returns the version of the Fortran run-time library (ifcore).
FOR_IFPORT_VERSION Portability Function: Returns the version of the Fortran portability library (ifport).
FOR_LFENCE Run-Time Subroutine: Inserts a memory load fence instruction that ensures completion of preceding load instructions.
FOR_MFENCE Run-Time Subroutine: Inserts a memory fence instruction that ensures completion of all preceding load and store instructions.
for_rtl_finish_ Run-Time Function: Cleans up the Fortran run-time environment; for example, flushing buffers and closing files. It also issues messages about floating-point exceptions, if any occur.
for_rtl_init_ Run-Time Subroutine: Initializes the Fortran run-time environment and causes Fortran procedures and subroutines to behave the same as when called from a Fortran main program. On Linux* and macOS*, it also establishes handlers and floating-point exception handling.
FOR_SET_FPE Run-Time Function: Sets the floating-point exception flags. This routine can be called from a C or Fortran program.
FOR_SET_REENTRANCY Run-Time Function: Controls the type of reentrancy protection that the Fortran Run-Time Library (RTL) exhibits. This routine can be called from a C or Fortran program.
FOR_SFENCE Run-Time Subroutine: Inserts a memory store fence instruction that ensures completion of preceding store instructions.
FORALL Statement and Construct: The FORALL statement and construct is an element-by-element generalization of the masked array assignment in the WHERE statement and construct. It allows more general array shapes to be assigned, especially in construct form. The FORALL construct is an obsolescent language feature in Fortran 2018.
FORMAT Statement: Specifies the form of data being transferred and the data conversion (editing) required to achieve that form.
FORM TEAM Statement: Defines team variables; creates one or more teams of images from the images on the current team.
FP_CLASS Elemental Intrinsic Function (Generic): Returns the class of an IEEE* real (binary32, binary64, and binary128) argument. This function cannot be passed as an actual argument.
FPUTC Portability Function: Writes a character to the file specified by a Fortran external unit, bypassing normal Fortran input/output.
FRACTION Elemental Intrinsic Function (Generic): Returns the fractional part of the model representation of the argument value.
FREE Intrinsic Subroutine (Specific): Frees a block of memory that is currently allocated. Intrinsic subroutines cannot be passed as actual arguments.
FREEFORM and NOFREEFORM General Compiler Directives: FREEFORM specifies that source code is in free-form format. NOFREEFORM specifies that source code is in fixed-form format.
FSEEK Portability Function: Repositions a file specified by a Fortran external unit.
FSTAT Portability Function: Returns detailed information about a file specified by a external unit number.
FTELL, FTELLI8 Portability Functions: Return the current position of a file.
FULLPATHQQ Portability Function: Returns the full path for a specified file or directory.
FUNCTION Statement: The initial statement of a function subprogram. A function subprogram is invoked in an expression and returns a single value (a function result) that is used to evaluate the expression.