Standard intrinsic module ISO_FORTRAN_ENV

Contents

Name

iso_fortran_env - standard intrinsic module

Usage

USE,INTRINSIC :: ISO_FORTRAN_ENV

(The ',INTRINSIC ::' part is optional.)

Synopsis

ISO_FORTRAN_ENV provides named constants describing the Fortran environment.

Storage units are described by CHARACTER_STORAGE_SIZE and NUMERIC_STORAGE_SIZE.

I/O units are described by ERROR_UNIT, INPUT_UNIT and OUTPUT_UNIT.

The RECL= specifier for the INQUIRE and OPEN statements is described by FILE_STORAGE_SIZE.

IOSTAT= return values are described by IOSTAT_END and IOSTAT_EOR. These and many other IOSTAT= return values are provided by the intrinsic module F90_IOSTAT (except that it provides IOSTAT_EOF instead of IOSTAT_END).

Parameter Descriptions

  INTEGER,PARAMETER :: character_storage_size = 8
The size of a character storage unit in bits. 

  INTEGER,PARAMETER :: error_unit = 0
The standard error reporting unit number. 

  INTEGER,PARAMETER :: file_storage_size = 8
The size of a file storage unit (used by RECL= in OPEN and INQUIRE) in bits. 

  INTEGER,PARAMETER :: input_unit = 5
The standard input unit number. This is the one used by READ with an asterisk ('*') unit. 

  INTEGER,PARAMETER :: iostat_end = -1
The IOSTAT= return value for end of file. 

  INTEGER,PARAMETER :: iostat_eor = -2
The IOSTAT= return value for end of record. 

  INTEGER,PARAMETER :: numeric_storage_size = BIT_SIZE(0)
The size of a numeric storage unit in bits. 

  INTEGER,PARAMETER :: output_unit = 6
The standard output unit number. This is the one used by PRINT, and by WRITE with an asterisk ('*') unit.

Files

The source code for this module may be found in the NAGWare library directory (usually /usr/local/NAGWare).

See Also

f90_iostat(3), nag_modules(3).

Bugs

Please report any bugs found to "support@nag.co.uk" or "infodesk@nag.com", along with any suggestions for improvements.

Author

Malcolm Cohen, Nihon Numerical Algorithms Group KK, Tokyo, Japan.