iso_fortran_env — standard intrinsic module
(The ',INTRINSIC ::' part is optional, unless there is a user-defined module with the same name.)
Kind parameter values for specific types are provided by INT8, INT16, INT32, INT64, REAL32, REAL64 and REAL128. Arrays listing all valid kind parameter values for each type are provided by CHARACTER_KINDS, INTEGER_KINDS, LOGICAL_KINDS and REAL_KINDS.
Storage units are described by CHARACTER_STORAGE_SIZE and NUMERIC_STORAGE_SIZE.
Input/output 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).
INTEGER,PARAMETER :: character_kinds(4) = [ KIND('A'), & SELECTED_CHAR_KIND('JIS_0213'), & SELECTED_CHAR_KIND('UCS_2'), & SELECTED_CHAR_KIND('ISO_10646') ]Array listing all valid kind type parameter values for CHARACTER type.
INTEGER,PARAMETER :: character_storage_size = 8The size of a character storage unit in bits.
INTEGER,PARAMETER :: error_unit = 0The standard error reporting unit number.
INTEGER,PARAMETER :: file_storage_size = 8The size of a file storage unit (used by RECL= in OPEN and INQUIRE) in bits.
INTEGER,PARAMETER :: input_unit = 5The standard input unit number. This is the one used by READ with an asterisk ('*') unit.
INTEGER,PARAMETER :: int8 = SELECTED_INT_KIND(2)The kind parameter value for an 8-bit integer.
INTEGER,PARAMETER :: int16 = SELECTED_INT_KIND(4)The kind parameter value for a 16-bit integer.
INTEGER,PARAMETER :: int32 = SELECTED_INT_KIND(9)The kind parameter value for a 32-bit integer.
INTEGER,PARAMETER :: int64 = SELECTED_INT_KIND(18)The kind parameter value for a 64-bit integer.
INTEGER,PARAMETER :: integer_kinds(4) = [ int8,int16,int32,int64 ]Array listing all valid kind type parameter values for INTEGER type.
INTEGER,PARAMETER :: iostat_end = -1The IOSTAT= return value for end of file.
INTEGER,PARAMETER :: iostat_eor = -2The IOSTAT= return value for end of record.
INTEGER,PARAMETER :: logical_kinds(4) = integer_kindsArray listing all valid kind type parameter values for LOGICAL type.
INTEGER,PARAMETER :: numeric_storage_size = BIT_SIZE(0)The size of a numeric storage unit in bits.
INTEGER,PARAMETER :: output_unit = 6The standard output unit number. This is the one used by PRINT, and by WRITE with an asterisk ('*') unit.
INTEGER,PARAMETER :: real32 = SELECTED_REAL_KIND(6)The kind parameter value for a 32-bit real.
INTEGER,PARAMETER :: real64 = SELECTED_REAL_KIND(15)The kind parameter value for a 64-bit real.
INTEGER,PARAMETER :: real128 = SELECTED_REAL_KIND(30)The kind parameter value for a 128-bit real.
INTEGER,PARAMETER :: real_kinds(3) = [ real32,real64,real128 ]Array listing all valid kind type parameter values for REAL type.
The source code for this module may be found in the NAG Fortran runtime library directory (usually /usr/local/lib/NAG_Fortran).
f90_iostat(3), f90_kind(3), nag_modules(3).
Please report any bugs found to ‘support@nag.co.uk’ or ‘support@nag.com’, along with any suggestions for improvements.
Malcolm Cohen, Nihon Numerical Algorithms Group KK, Tokyo, Japan.