libsim Versione 7.2.6

◆ int_s

integer, parameter int_s = SELECTED_INT_KIND(4)

2-byte integer (short)

Definizione alla linea 249 del file kinds.F90.

249! Copyright (C) 2010 ARPA-SIM <urpsim@smr.arpa.emr.it>
250! authors:
251! Davide Cesari <dcesari@arpa.emr.it>
252! Paolo Patruno <ppatruno@arpa.emr.it>
253
254! This program is free software; you can redistribute it and/or
255! modify it under the terms of the GNU General Public License as
256! published by the Free Software Foundation; either version 2 of
257! the License, or (at your option) any later version.
258
259! This program is distributed in the hope that it will be useful,
260! but WITHOUT ANY WARRANTY; without even the implied warranty of
261! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
262! GNU General Public License for more details.
263
264! You should have received a copy of the GNU General Public License
265! along with this program. If not, see <http://www.gnu.org/licenses/>.
266#include "config.h"
267!> \defgroup base Libsim package, base library.
268!! The libsim base library defines modules and classes of general
269!! use for scientifical applications in Fortran 90. In order to
270!! compile and link programs using this library, you have to insert
271!! the required \c USE statements in the program units involved,
272!! specify the location of module files when compiling (tipically \c
273!! -I/usr/lib/gfortran/modules or \c -I/usr/lib64/gfortran/modules or
274!! \c -I/usr/include) and indicate the library name \c -lsim_base when
275!! linking, assuming that the library has been installed in a default
276!! location.
277
278!> Definition of constants to be used for declaring variables of a
279!! desired type. This module defines constants that can be portably
280!! used when declaring variables (through the \c KIND attribute) and
281!! when defining constants (through the underscore character \c _ ) in
282!! order to be sure that the desired type is used.
283!!
284!! There is a subtle difference between platform-default single and
285!! double precision real, obtained by declaring a variable of type \c
286!! REAL or \c DOUBLE \c PRECISION respectively, and single and double
287!! precision IEEE (4 and 8 bytes respectively) which are the standard
288!! IEEE data types and which are declared through \c REAL(kind=fp_s)
289!! and \c REAL(kind=fp_d) respectively: these two pairs of types
290!! usually coincide, but it may be not the case on some platforms, so
291!! you should choose one or the other approach depending on situation.
292!!
293!! Example of typical use:
294!! \code
295!! USE kinds
296!! ...
297!! INTEGER(kind=int_b) :: ab, bb
298!! REAL(kind=fp_d) :: dd
299!!
300!! ab = 13_int_b
301!! dd = REAL(ab, kind=fp_d)
302!! ...
303!! \endcode
304!! \ingroup base
305MODULE kinds
306IMPLICIT NONE
307
308INTEGER, PARAMETER :: int_b = selected_int_kind(1) !< 1-byte integer (byte)
309INTEGER, PARAMETER :: int_s = selected_int_kind(4) !< 2-byte integer (short)
310INTEGER, PARAMETER :: int_l = selected_int_kind(8) !< 4-byte integer (long)
311INTEGER, PARAMETER, PRIVATE :: &
312 int_ll_t = selected_int_kind(16)
313!> 8-byte integer (long long) if supported, otherwise 4-byte integer
314INTEGER, PARAMETER :: int_ll = &
315 ( ( ( 1 + sign( 1, int_ll_t ) ) / 2 ) * int_ll_t ) + &
316 ( ( ( 1 - sign( 1, int_ll_t ) ) / 2 ) * int_l )
317
318INTEGER, PARAMETER :: fp_s = selected_real_kind(6) !< single precision floating point (4 byte IEEE)
319INTEGER, PARAMETER :: fp_d = selected_real_kind(15) !< double precision floating point (8 byte IEEE)
320INTEGER, PARAMETER, PRIVATE :: fp_q_t = selected_real_kind(20)
321!> quad precision floating point (16 byte IEEE) if supported, otherwise double precision floating point
322INTEGER, PARAMETER :: fp_q = &
323 ( ( ( 1 + sign( 1, fp_q_t ) ) / 2 ) * fp_q_t ) + &
324 ( ( ( 1 - sign( 1, fp_q_t ) ) / 2 ) * fp_d )
325
326INTEGER, PARAMETER :: ptr_c = sizeof_ptr_c !< kind for an integer having the same size of a C pointer
327
328END MODULE kinds
Definition of constants to be used for declaring variables of a desired type.
Definition kinds.F90:245

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