gcc/f/g77.info-9

This is Info file g77.info, produced by Makeinfo version 1.68 from the
input file g77.texi.

   This file explains how to use the GNU Fortran system.

   Published by the Free Software Foundation 59 Temple Place - Suite 330
Boston, MA 02111-1307 USA

   Copyright (C) 1995-1997 Free Software Foundation, Inc.

   Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.

   Permission is granted to copy and distribute modified versions of
this manual under the conditions for verbatim copying, provided also
that the sections entitled "GNU General Public License," "Funding for
Free Software," and "Protect Your Freedom--Fight `Look And Feel'" are
included exactly as in the original, and provided that the entire
resulting derived work is distributed under the terms of a permission
notice identical to this one.

   Permission is granted to copy and distribute translations of this
manual into another language, under the above conditions for modified
versions, except that the sections entitled "GNU General Public
License," "Funding for Free Software," and "Protect Your Freedom--Fight
`Look And Feel'", and this permission notice, may be included in
translations approved by the Free Software Foundation instead of in the
original English.

   Contributed by James Craig Burley (<burley@gnu.org>).  Inspired by a
first pass at translating `g77-0.5.16/f/DOC' that was contributed to
Craig by David Ronis (<ronis@onsager.chem.mcgill.ca>).

INFO-DIR-SECTION Fortran Programming
START-INFO-DIR-ENTRY
* g77: (g77).               The GNU Fortran compilation system.
END-INFO-DIR-ENTRY


File: g77.info,  Node: IShft Intrinsic,  Next: IShftC Intrinsic,  Prev: IsaTty Intrinsic,  Up: Table of Intrinsic Functions

IShft Intrinsic
...............

     IShft(I, SHIFT)

IShft: `INTEGER' function, the `KIND=' value of the type being that of
argument I.

I: `INTEGER'; scalar; INTENT(IN).

SHIFT: `INTEGER'; scalar; INTENT(IN).

Intrinsic groups: `mil', `f90', `vxt'.

Description:

   All bits representing I are shifted SHIFT places.  `SHIFT.GT.0'
indicates a left shift, `SHIFT.EQ.0' indicates no shift and
`SHIFT.LT.0' indicates a right shift.  If the absolute value of the
shift count is greater than `BIT_SIZE(I)', the result is undefined.
Bits shifted out from the left end or the right end, as the case may be,
are lost.  Zeros are shifted in from the opposite end.

   *Note IShftC Intrinsic:: for the circular-shift equivalent.


File: g77.info,  Node: IShftC Intrinsic,  Next: ISign Intrinsic,  Prev: IShft Intrinsic,  Up: Table of Intrinsic Functions

IShftC Intrinsic
................

     IShftC(I, SHIFT, SIZE)

IShftC: `INTEGER' function, the `KIND=' value of the type being that of
argument I.

I: `INTEGER'; scalar; INTENT(IN).

SHIFT: `INTEGER'; scalar; INTENT(IN).

SIZE: `INTEGER'; scalar; INTENT(IN).

Intrinsic groups: `mil', `f90', `vxt'.

Description:

   The rightmost SIZE bits of the argument I are shifted circularly
SHIFT places, i.e. the bits shifted out of one end are shifted into the
opposite end.  No bits are lost.  The unshifted bits of the result are
the same as the unshifted bits of I.  The  absolute value of the
argument SHIFT must be less than or equal to SIZE.  The value of SIZE
must be greater than or equal to one and less than or equal to
`BIT_SIZE(I)'.

   *Note IShft Intrinsic:: for the logical shift equivalent.


File: g77.info,  Node: ISign Intrinsic,  Next: ITime Intrinsic,  Prev: IShftC Intrinsic,  Up: Table of Intrinsic Functions

ISign Intrinsic
...............

     ISign(A, B)

ISign: `INTEGER(KIND=1)' function.

A: `INTEGER(KIND=1)'; scalar; INTENT(IN).

B: `INTEGER(KIND=1)'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Archaic form of `SIGN()' that is specific to one type for A and B.
*Note Sign Intrinsic::.


File: g77.info,  Node: ITime Intrinsic,  Next: Kill Intrinsic (subroutine),  Prev: ISign Intrinsic,  Up: Table of Intrinsic Functions

ITime Intrinsic
...............

     CALL ITime(TARRAY)

TARRAY: `INTEGER(KIND=1)'; DIMENSION(3); INTENT(OUT).

Intrinsic groups: `unix'.

Description:

   Returns the current local time hour, minutes, and seconds in elements
1, 2, and 3 of TARRAY, respectively.


File: g77.info,  Node: Kill Intrinsic (subroutine),  Next: Kind Intrinsic,  Prev: ITime Intrinsic,  Up: Table of Intrinsic Functions

Kill Intrinsic (subroutine)
...........................

     CALL Kill(PID, SIGNAL, STATUS)

PID: `INTEGER'; scalar; INTENT(IN).

SIGNAL: `INTEGER'; scalar; INTENT(IN).

STATUS: `INTEGER(KIND=1)'; OPTIONAL; scalar; INTENT(OUT).

Intrinsic groups: `unix'.

Description:

   Sends the signal specified by SIGNAL to the process PID.  If the
STATUS argument is supplied, it contains 0 on success or a non-zero
error code upon return.  See `kill(2)'.

   Some non-GNU implementations of Fortran provide this intrinsic as
only a function, not as a subroutine, or do not support the (optional)
STATUS argument.

   For information on other intrinsics with the same name: *Note Kill
Intrinsic (function)::.


File: g77.info,  Node: Kind Intrinsic,  Next: LBound Intrinsic,  Prev: Kill Intrinsic (subroutine),  Up: Table of Intrinsic Functions

Kind Intrinsic
..............

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Kind' to use this name for an
external procedure.


File: g77.info,  Node: LBound Intrinsic,  Next: Len Intrinsic,  Prev: Kind Intrinsic,  Up: Table of Intrinsic Functions

LBound Intrinsic
................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL LBound' to use this name for an
external procedure.


File: g77.info,  Node: Len Intrinsic,  Next: Len_Trim Intrinsic,  Prev: LBound Intrinsic,  Up: Table of Intrinsic Functions

Len Intrinsic
.............

     Len(STRING)

Len: `INTEGER(KIND=1)' function.

STRING: `CHARACTER'; scalar.

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns the length of STRING.

   If STRING is an array, the length of an element of STRING is
returned.

   Note that STRING need not be defined when this intrinsic is invoked,
since only the length, not the content, of STRING is needed.

   *Note Bit_Size Intrinsic::, for the function that determines the
size of its argument in bits.


File: g77.info,  Node: Len_Trim Intrinsic,  Next: LGe Intrinsic,  Prev: Len Intrinsic,  Up: Table of Intrinsic Functions

Len_Trim Intrinsic
..................

     Len_Trim(STRING)

Len_Trim: `INTEGER(KIND=1)' function.

STRING: `CHARACTER'; scalar; INTENT(IN).

Intrinsic groups: `f90'.

Description:

   Returns the index of the last non-blank character in STRING.
`LNBLNK' and `LEN_TRIM' are equivalent.


File: g77.info,  Node: LGe Intrinsic,  Next: LGt Intrinsic,  Prev: Len_Trim Intrinsic,  Up: Table of Intrinsic Functions

LGe Intrinsic
.............

     LGe(STRING_A, STRING_B)

LGe: `LOGICAL(KIND=1)' function.

STRING_A: `CHARACTER'; scalar; INTENT(IN).

STRING_B: `CHARACTER'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns `.TRUE.' if `STRING_A.GE.STRING_B', `.FALSE.' otherwise.
STRING_A and STRING_B are interpreted as containing ASCII character
codes.  If either value contains a character not in the ASCII character
set, the result is processor dependent.

   If the STRING_A and STRING_B are not the same length, the shorter is
compared as if spaces were appended to it to form a value that has the
same length as the longer.

   The lexical comparison intrinsics `LGe', `LGt', `LLe', and `LLt'
differ from the corresponding intrinsic operators `.GE.', `.GT.',
`.LE.', `.LT.'.  Because the ASCII collating sequence is assumed, the
following expressions always return `.TRUE.':

     LGE ('0', ' ')
     LGE ('A', '0')
     LGE ('a', 'A')

   The following related expressions do *not* always return `.TRUE.',
as they are not necessarily evaluated assuming the arguments use ASCII
encoding:

     '0' .GE. ' '
     'A' .GE. '0'
     'a' .GE. 'A'

   The same difference exists between `LGt' and `.GT.'; between `LLe'
and `.LE.'; and between `LLt' and `.LT.'.


File: g77.info,  Node: LGt Intrinsic,  Next: Link Intrinsic (subroutine),  Prev: LGe Intrinsic,  Up: Table of Intrinsic Functions

LGt Intrinsic
.............

     LGt(STRING_A, STRING_B)

LGt: `LOGICAL(KIND=1)' function.

STRING_A: `CHARACTER'; scalar; INTENT(IN).

STRING_B: `CHARACTER'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns `.TRUE.' if `STRING_A.GT.STRING_B', `.FALSE.' otherwise.
STRING_A and STRING_B are interpreted as containing ASCII character
codes.  If either value contains a character not in the ASCII character
set, the result is processor dependent.

   If the STRING_A and STRING_B are not the same length, the shorter is
compared as if spaces were appended to it to form a value that has the
same length as the longer.

   *Note LGe Intrinsic::, for information on the distinction between
the `LGT' intrinsic and the `.GT.'  operator.


File: g77.info,  Node: Link Intrinsic (subroutine),  Next: LLe Intrinsic,  Prev: LGt Intrinsic,  Up: Table of Intrinsic Functions

Link Intrinsic (subroutine)
...........................

     CALL Link(PATH1, PATH2, STATUS)

PATH1: `CHARACTER'; scalar; INTENT(IN).

PATH2: `CHARACTER'; scalar; INTENT(IN).

STATUS: `INTEGER(KIND=1)'; OPTIONAL; scalar; INTENT(OUT).

Intrinsic groups: `unix'.

Description:

   Makes a (hard) link from file PATH1 to PATH2.  A null character
(`CHAR(0)') marks the end of the names in PATH1 and PATH2--otherwise,
trailing blanks in PATH1 and PATH2 are ignored.  If the STATUS argument
is supplied, it contains 0 on success or a non-zero error code upon
return.  See `link(2)'.

   Some non-GNU implementations of Fortran provide this intrinsic as
only a function, not as a subroutine, or do not support the (optional)
STATUS argument.

   For information on other intrinsics with the same name: *Note Link
Intrinsic (function)::.


File: g77.info,  Node: LLe Intrinsic,  Next: LLt Intrinsic,  Prev: Link Intrinsic (subroutine),  Up: Table of Intrinsic Functions

LLe Intrinsic
.............

     LLe(STRING_A, STRING_B)

LLe: `LOGICAL(KIND=1)' function.

STRING_A: `CHARACTER'; scalar; INTENT(IN).

STRING_B: `CHARACTER'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns `.TRUE.' if `STRING_A.LE.STRING_B', `.FALSE.' otherwise.
STRING_A and STRING_B are interpreted as containing ASCII character
codes.  If either value contains a character not in the ASCII character
set, the result is processor dependent.

   If the STRING_A and STRING_B are not the same length, the shorter is
compared as if spaces were appended to it to form a value that has the
same length as the longer.

   *Note LGe Intrinsic::, for information on the distinction between
the `LLE' intrinsic and the `.LE.'  operator.


File: g77.info,  Node: LLt Intrinsic,  Next: LnBlnk Intrinsic,  Prev: LLe Intrinsic,  Up: Table of Intrinsic Functions

LLt Intrinsic
.............

     LLt(STRING_A, STRING_B)

LLt: `LOGICAL(KIND=1)' function.

STRING_A: `CHARACTER'; scalar; INTENT(IN).

STRING_B: `CHARACTER'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns `.TRUE.' if `STRING_A.LT.STRING_B', `.FALSE.' otherwise.
STRING_A and STRING_B are interpreted as containing ASCII character
codes.  If either value contains a character not in the ASCII character
set, the result is processor dependent.

   If the STRING_A and STRING_B are not the same length, the shorter is
compared as if spaces were appended to it to form a value that has the
same length as the longer.

   *Note LGe Intrinsic::, for information on the distinction between
the `LLT' intrinsic and the `.LT.'  operator.


File: g77.info,  Node: LnBlnk Intrinsic,  Next: Loc Intrinsic,  Prev: LLt Intrinsic,  Up: Table of Intrinsic Functions

LnBlnk Intrinsic
................

     LnBlnk(STRING)

LnBlnk: `INTEGER(KIND=1)' function.

STRING: `CHARACTER'; scalar; INTENT(IN).

Intrinsic groups: `unix'.

Description:

   Returns the index of the last non-blank character in STRING.
`LNBLNK' and `LEN_TRIM' are equivalent.


File: g77.info,  Node: Loc Intrinsic,  Next: Log Intrinsic,  Prev: LnBlnk Intrinsic,  Up: Table of Intrinsic Functions

Loc Intrinsic
.............

     Loc(ENTITY)

Loc: `INTEGER(KIND=7)' function.

ENTITY: Any type; cannot be a constant or expression.

Intrinsic groups: `unix'.

Description:

   The `LOC()' intrinsic works the same way as the `%LOC()' construct.
*Note The `%LOC()' Construct: %LOC(), for more information.


File: g77.info,  Node: Log Intrinsic,  Next: Log10 Intrinsic,  Prev: Loc Intrinsic,  Up: Table of Intrinsic Functions

Log Intrinsic
.............

     Log(X)

Log: `REAL' or `COMPLEX' function, the exact type being that of
argument X.

X: `REAL' or `COMPLEX'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns the natural logarithm of X, which must be greater than zero
or, if type `COMPLEX', must not be zero.

   *Note Exp Intrinsic::, for the inverse of this function.

   *Note Log10 Intrinsic::, for the base-10 logarithm function.


File: g77.info,  Node: Log10 Intrinsic,  Next: Logical Intrinsic,  Prev: Log Intrinsic,  Up: Table of Intrinsic Functions

Log10 Intrinsic
...............

     Log10(X)

Log10: `REAL' function, the `KIND=' value of the type being that of
argument X.

X: `REAL'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns the natural logarithm of X, which must be greater than zero
or, if type `COMPLEX', must not be zero.

   The inverse of this function is `10. ** LOG10(X)'.

   *Note Log Intrinsic::, for the natural logarithm function.


File: g77.info,  Node: Logical Intrinsic,  Next: Long Intrinsic,  Prev: Log10 Intrinsic,  Up: Table of Intrinsic Functions

Logical Intrinsic
.................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Logical' to use this name for
an external procedure.


File: g77.info,  Node: Long Intrinsic,  Next: LShift Intrinsic,  Prev: Logical Intrinsic,  Up: Table of Intrinsic Functions

Long Intrinsic
..............

     Long(A)

Long: `INTEGER(KIND=1)' function.

A: `INTEGER(KIND=6)'; scalar; INTENT(IN).

Intrinsic groups: `unix'.

Description:

   Archaic form of `INT()' that is specific to one type for A.  *Note
Int Intrinsic::.

   The precise meaning of this intrinsic might change in a future
version of the GNU Fortran language, as more is learned about how it is
used.


File: g77.info,  Node: LShift Intrinsic,  Next: LStat Intrinsic (subroutine),  Prev: Long Intrinsic,  Up: Table of Intrinsic Functions

LShift Intrinsic
................

     LShift(I, SHIFT)

LShift: `INTEGER' function, the `KIND=' value of the type being that of
argument I.

I: `INTEGER'; scalar; INTENT(IN).

SHIFT: `INTEGER'; scalar; INTENT(IN).

Intrinsic groups: `f2c'.

Description:

   Returns I shifted to the left SHIFT bits.

   Although similar to the expression `I*(2**SHIFT)', there are
important differences.  For example, the sign of the result is not
necessarily the same as the sign of I.

   Currently this intrinsic is defined assuming the underlying
representation of I is as a two's-complement integer.  It is unclear at
this point whether that definition will apply when a different
representation is involved.

   *Note LShift Intrinsic::, for the inverse of this function.

   *Note IShft Intrinsic::, for information on a more widely available
left-shifting intrinsic that is also more precisely defined.


File: g77.info,  Node: LStat Intrinsic (subroutine),  Next: LStat Intrinsic (function),  Prev: LShift Intrinsic,  Up: Table of Intrinsic Functions

LStat Intrinsic (subroutine)
............................

     CALL LStat(FILE, SARRAY, STATUS)

FILE: `CHARACTER'; scalar; INTENT(IN).

SARRAY: `INTEGER(KIND=1)'; DIMENSION(13); INTENT(OUT).

STATUS: `INTEGER(KIND=1)'; OPTIONAL; scalar; INTENT(OUT).

Intrinsic groups: `unix'.

Description:

   Obtains data about the given file FILE and places them in the array
SARRAY.  A null character (`CHAR(0)') marks the end of the name in
FILE--otherwise, trailing blanks in FILE are ignored.  If FILE is a
symbolic link it returns data on the link itself, so the routine is
available only on systems that support symbolic links.  The values in
this array are extracted from the `stat' structure as returned by
`fstat(2)' q.v., as follows:

  1. File mode

  2. Inode number

  3. ID of device containing directory entry for file

  4. Device id (if relevant)

  5. Number of links

  6. Owner's uid

  7. Owner's gid

  8. File size (bytes)

  9. Last access time

 10. Last modification time

 11. Last file status change time

 12. Preferred I/O block size

 13. Number of blocks allocated

   Not all these elements are relevant on all systems.  If an element
is not relevant, it is returned as 0.

   If the STATUS argument is supplied, it contains 0 on success or a
non-zero error code upon return (`ENOSYS' if the system does not
provide `lstat(2)').

   Some non-GNU implementations of Fortran provide this intrinsic as
only a function, not as a subroutine, or do not support the (optional)
STATUS argument.

   For information on other intrinsics with the same name: *Note LStat
Intrinsic (function)::.


File: g77.info,  Node: LStat Intrinsic (function),  Next: LTime Intrinsic,  Prev: LStat Intrinsic (subroutine),  Up: Table of Intrinsic Functions

LStat Intrinsic (function)
..........................

     LStat(FILE, SARRAY)

LStat: `INTEGER(KIND=1)' function.

FILE: `CHARACTER'; scalar; INTENT(IN).

SARRAY: `INTEGER(KIND=1)'; DIMENSION(13); INTENT(OUT).

Intrinsic groups: `unix'.

Description:

   Obtains data about the given file FILE and places them in the array
SARRAY.  A null character (`CHAR(0)') marks the end of the name in
FILE--otherwise, trailing blanks in FILE are ignored.  If FILE is a
symbolic link it returns data on the link itself, so the routine is
available only on systems that support symbolic links.  The values in
this array are extracted from the `stat' structure as returned by
`fstat(2)' q.v., as follows:

  1. File mode

  2. Inode number

  3. ID of device containing directory entry for file

  4. Device id (if relevant)

  5. Number of links

  6. Owner's uid

  7. Owner's gid

  8. File size (bytes)

  9. Last access time

 10. Last modification time

 11. Last file status change time

 12. Preferred I/O block size

 13. Number of blocks allocated

   Not all these elements are relevant on all systems.  If an element
is not relevant, it is returned as 0.

   Returns 0 on success or a non-zero error code (`ENOSYS' if the
system does not provide `lstat(2)').

   For information on other intrinsics with the same name: *Note LStat
Intrinsic (subroutine)::.


File: g77.info,  Node: LTime Intrinsic,  Next: MatMul Intrinsic,  Prev: LStat Intrinsic (function),  Up: Table of Intrinsic Functions

LTime Intrinsic
...............

     CALL LTime(STIME, TARRAY)

STIME: `INTEGER(KIND=1)'; scalar; INTENT(IN).

TARRAY: `INTEGER(KIND=1)'; DIMENSION(9); INTENT(OUT).

Intrinsic groups: `unix'.

Description:

   Given a system time value STIME, fills TARRAY with values extracted
from it appropriate to the GMT time zone using `localtime(3)'.

   The array elements are as follows:

  1. Seconds after the minute, range 0-59 or 0-61 to allow for leap
     seconds

  2. Minutes after the hour, range 0-59

  3. Hours past midnight, range 0-23

  4. Day of month, range 0-31

  5. Number of months since January, range 0-12

  6. Years since 1900

  7. Number of days since Sunday, range 0-6

  8. Days since January 1

  9. Daylight savings indicator: positive if daylight savings is in
     effect, zero if not, and negative if the information isn't
     available.


File: g77.info,  Node: MatMul Intrinsic,  Next: Max Intrinsic,  Prev: LTime Intrinsic,  Up: Table of Intrinsic Functions

MatMul Intrinsic
................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL MatMul' to use this name for an
external procedure.


File: g77.info,  Node: Max Intrinsic,  Next: Max0 Intrinsic,  Prev: MatMul Intrinsic,  Up: Table of Intrinsic Functions

Max Intrinsic
.............

     Max(A-1, A-2, ..., A-n)

Max: `INTEGER' or `REAL' function, the exact type being the result of
cross-promoting the types of all the arguments.

A: `INTEGER' or `REAL'; at least two such arguments must be provided;
scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns the argument with the largest value.

   *Note Min Intrinsic::, for the opposite function.


File: g77.info,  Node: Max0 Intrinsic,  Next: Max1 Intrinsic,  Prev: Max Intrinsic,  Up: Table of Intrinsic Functions

Max0 Intrinsic
..............

     Max0(A-1, A-2, ..., A-n)

Max0: `INTEGER(KIND=1)' function.

A: `INTEGER(KIND=1)'; at least two such arguments must be provided;
scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Archaic form of `MAX()' that is specific to one type for A.  *Note
Max Intrinsic::.


File: g77.info,  Node: Max1 Intrinsic,  Next: MaxExponent Intrinsic,  Prev: Max0 Intrinsic,  Up: Table of Intrinsic Functions

Max1 Intrinsic
..............

     Max1(A-1, A-2, ..., A-n)

Max1: `INTEGER(KIND=1)' function.

A: `REAL(KIND=1)'; at least two such arguments must be provided;
scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Archaic form of `MAX()' that is specific to one type for A and a
different return type.  *Note Max Intrinsic::.


File: g77.info,  Node: MaxExponent Intrinsic,  Next: MaxLoc Intrinsic,  Prev: Max1 Intrinsic,  Up: Table of Intrinsic Functions

MaxExponent Intrinsic
.....................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL MaxExponent' to use this name
for an external procedure.


File: g77.info,  Node: MaxLoc Intrinsic,  Next: MaxVal Intrinsic,  Prev: MaxExponent Intrinsic,  Up: Table of Intrinsic Functions

MaxLoc Intrinsic
................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL MaxLoc' to use this name for an
external procedure.


File: g77.info,  Node: MaxVal Intrinsic,  Next: MClock Intrinsic,  Prev: MaxLoc Intrinsic,  Up: Table of Intrinsic Functions

MaxVal Intrinsic
................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL MaxVal' to use this name for an
external procedure.


File: g77.info,  Node: MClock Intrinsic,  Next: MClock8 Intrinsic,  Prev: MaxVal Intrinsic,  Up: Table of Intrinsic Functions

MClock Intrinsic
................

     MClock()

MClock: `INTEGER(KIND=1)' function.

Intrinsic groups: `unix'.

Description:

   Returns the number of clock ticks since the start of the process.
Supported on systems with `clock(3)' (q.v.).

   This intrinsic is not fully portable, such as to systems with 32-bit
`INTEGER' types but supporting times wider than 32 bits.  *Note MClock8
Intrinsic::, for information on a similar intrinsic that might be
portable to more GNU Fortran implementations, though to fewer Fortran
compilers.

   If the system does not support `clock(3)', -1 is returned.


File: g77.info,  Node: MClock8 Intrinsic,  Next: Merge Intrinsic,  Prev: MClock Intrinsic,  Up: Table of Intrinsic Functions

MClock8 Intrinsic
.................

     MClock8()

MClock8: `INTEGER(KIND=2)' function.

Intrinsic groups: `unix'.

Description:

   Returns the number of clock ticks since the start of the process.
Supported on systems with `clock(3)' (q.v.).

   No Fortran implementations other than GNU Fortran are known to
support this intrinsic at the time of this writing.  *Note MClock
Intrinsic::, for information on a similar intrinsic that might be
portable to more Fortran compilers, though to fewer GNU Fortran
implementations.

   If the system does not support `clock(3)', -1 is returned.


File: g77.info,  Node: Merge Intrinsic,  Next: Min Intrinsic,  Prev: MClock8 Intrinsic,  Up: Table of Intrinsic Functions

Merge Intrinsic
...............

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Merge' to use this name for an
external procedure.


File: g77.info,  Node: Min Intrinsic,  Next: Min0 Intrinsic,  Prev: Merge Intrinsic,  Up: Table of Intrinsic Functions

Min Intrinsic
.............

     Min(A-1, A-2, ..., A-n)

Min: `INTEGER' or `REAL' function, the exact type being the result of
cross-promoting the types of all the arguments.

A: `INTEGER' or `REAL'; at least two such arguments must be provided;
scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns the argument with the smallest value.

   *Note Max Intrinsic::, for the opposite function.


File: g77.info,  Node: Min0 Intrinsic,  Next: Min1 Intrinsic,  Prev: Min Intrinsic,  Up: Table of Intrinsic Functions

Min0 Intrinsic
..............

     Min0(A-1, A-2, ..., A-n)

Min0: `INTEGER(KIND=1)' function.

A: `INTEGER(KIND=1)'; at least two such arguments must be provided;
scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Archaic form of `MIN()' that is specific to one type for A.  *Note
Min Intrinsic::.


File: g77.info,  Node: Min1 Intrinsic,  Next: MinExponent Intrinsic,  Prev: Min0 Intrinsic,  Up: Table of Intrinsic Functions

Min1 Intrinsic
..............

     Min1(A-1, A-2, ..., A-n)

Min1: `INTEGER(KIND=1)' function.

A: `REAL(KIND=1)'; at least two such arguments must be provided;
scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Archaic form of `MIN()' that is specific to one type for A and a
different return type.  *Note Min Intrinsic::.


File: g77.info,  Node: MinExponent Intrinsic,  Next: MinLoc Intrinsic,  Prev: Min1 Intrinsic,  Up: Table of Intrinsic Functions

MinExponent Intrinsic
.....................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL MinExponent' to use this name
for an external procedure.


File: g77.info,  Node: MinLoc Intrinsic,  Next: MinVal Intrinsic,  Prev: MinExponent Intrinsic,  Up: Table of Intrinsic Functions

MinLoc Intrinsic
................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL MinLoc' to use this name for an
external procedure.


File: g77.info,  Node: MinVal Intrinsic,  Next: Mod Intrinsic,  Prev: MinLoc Intrinsic,  Up: Table of Intrinsic Functions

MinVal Intrinsic
................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL MinVal' to use this name for an
external procedure.


File: g77.info,  Node: Mod Intrinsic,  Next: Modulo Intrinsic,  Prev: MinVal Intrinsic,  Up: Table of Intrinsic Functions

Mod Intrinsic
.............

     Mod(A, P)

Mod: `INTEGER' or `REAL' function, the exact type being the result of
cross-promoting the types of all the arguments.

A: `INTEGER' or `REAL'; scalar; INTENT(IN).

P: `INTEGER' or `REAL'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns remainder calculated as:

     A - (INT(A / P) * P)

   P must not be zero.


File: g77.info,  Node: Modulo Intrinsic,  Next: MvBits Intrinsic,  Prev: Mod Intrinsic,  Up: Table of Intrinsic Functions

Modulo Intrinsic
................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Modulo' to use this name for an
external procedure.


File: g77.info,  Node: MvBits Intrinsic,  Next: Nearest Intrinsic,  Prev: Modulo Intrinsic,  Up: Table of Intrinsic Functions

MvBits Intrinsic
................

     CALL MvBits(FROM, FROMPOS, LEN, TO, TOPOS)

FROM: `INTEGER'; scalar; INTENT(IN).

FROMPOS: `INTEGER'; scalar; INTENT(IN).

LEN: `INTEGER'; scalar; INTENT(IN).

TO: `INTEGER' with same `KIND=' value as for FROM; scalar;
INTENT(INOUT).

TOPOS: `INTEGER'; scalar; INTENT(IN).

Intrinsic groups: `mil', `f90', `vxt'.

Description:

   Moves LEN bits from positions FROMPOS through `FROMPOS+LEN-1' of
FROM to positions TOPOS through `FROMPOS+LEN-1' of TO.  The portion of
argument TO not affected by the movement of bits is unchanged.
Arguments FROM and TO are permitted to be the same numeric storage
unit.  The values of `FROMPOS+LEN' and `TOPOS+LEN' must be less than or
equal to `BIT_SIZE(FROM)'.


File: g77.info,  Node: Nearest Intrinsic,  Next: NInt Intrinsic,  Prev: MvBits Intrinsic,  Up: Table of Intrinsic Functions

Nearest Intrinsic
.................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Nearest' to use this name for
an external procedure.


File: g77.info,  Node: NInt Intrinsic,  Next: Not Intrinsic,  Prev: Nearest Intrinsic,  Up: Table of Intrinsic Functions

NInt Intrinsic
..............

     NInt(A)

NInt: `INTEGER(KIND=1)' function.

A: `REAL'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns A with the fractional portion of its magnitude eliminated by
rounding to the nearest whole number and with its sign preserved,
converted to type `INTEGER(KIND=1)'.

   If A is type `COMPLEX', its real part is rounded and converted.

   A fractional portion exactly equal to `.5' is rounded to the whole
number that is larger in magnitude.  (Also called "Fortran round".)

   *Note Int Intrinsic::, for how to convert, truncate to whole number.

   *Note ANInt Intrinsic::, for how to round to nearest whole number
without converting.


File: g77.info,  Node: Not Intrinsic,  Next: Or Intrinsic,  Prev: NInt Intrinsic,  Up: Table of Intrinsic Functions

Not Intrinsic
.............

     Not(I)

Not: `INTEGER' function, the `KIND=' value of the type being that of
argument I.

I: `INTEGER'; scalar; INTENT(IN).

Intrinsic groups: `mil', `f90', `vxt'.

Description:

   Returns value resulting from boolean NOT of each bit in I.


File: g77.info,  Node: Or Intrinsic,  Next: Pack Intrinsic,  Prev: Not Intrinsic,  Up: Table of Intrinsic Functions

Or Intrinsic
............

     Or(I, J)

Or: `INTEGER' or `LOGICAL' function, the exact type being the result of
cross-promoting the types of all the arguments.

I: `INTEGER' or `LOGICAL'; scalar; INTENT(IN).

J: `INTEGER' or `LOGICAL'; scalar; INTENT(IN).

Intrinsic groups: `f2c'.

Description:

   Returns value resulting from boolean OR of pair of bits in each of I
and J.


File: g77.info,  Node: Pack Intrinsic,  Next: PError Intrinsic,  Prev: Or Intrinsic,  Up: Table of Intrinsic Functions

Pack Intrinsic
..............

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Pack' to use this name for an
external procedure.


File: g77.info,  Node: PError Intrinsic,  Next: Precision Intrinsic,  Prev: Pack Intrinsic,  Up: Table of Intrinsic Functions

PError Intrinsic
................

     CALL PError(STRING)

STRING: `CHARACTER'; scalar; INTENT(IN).

Intrinsic groups: `unix'.

Description:

   Prints (on the C `stderr' stream) a newline-terminated error message
corresponding to the last system error.  This is prefixed by STRING, a
colon and a space.  See `perror(3)'.


File: g77.info,  Node: Precision Intrinsic,  Next: Present Intrinsic,  Prev: PError Intrinsic,  Up: Table of Intrinsic Functions

Precision Intrinsic
...................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Precision' to use this name
for an external procedure.


File: g77.info,  Node: Present Intrinsic,  Next: Product Intrinsic,  Prev: Precision Intrinsic,  Up: Table of Intrinsic Functions

Present Intrinsic
.................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Present' to use this name for
an external procedure.


File: g77.info,  Node: Product Intrinsic,  Next: Radix Intrinsic,  Prev: Present Intrinsic,  Up: Table of Intrinsic Functions

Product Intrinsic
.................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Product' to use this name for
an external procedure.


File: g77.info,  Node: Radix Intrinsic,  Next: Rand Intrinsic,  Prev: Product Intrinsic,  Up: Table of Intrinsic Functions

Radix Intrinsic
...............

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Radix' to use this name for an
external procedure.


File: g77.info,  Node: Rand Intrinsic,  Next: Random_Number Intrinsic,  Prev: Radix Intrinsic,  Up: Table of Intrinsic Functions

Rand Intrinsic
..............

     Rand(FLAG)

Rand: `REAL(KIND=1)' function.

FLAG: `INTEGER'; OPTIONAL; scalar; INTENT(IN).

Intrinsic groups: `unix'.

Description:

   Returns a uniform quasi-random number between 0 and 1.  If FLAG is
0, the next number in sequence is returned; if FLAG is 1, the generator
is restarted by calling `srand(0)'; if FLAG has any other value, it is
used as a new seed with `srand'.

   *Note SRand Intrinsic::.

   *Note:* As typically implemented (by the routine of the same name in
the C library), this random number generator is a very poor one, though
the BSD and GNU libraries provide a much better implementation than the
`traditional' one.  On a different system you almost certainly want to
use something better.


File: g77.info,  Node: Random_Number Intrinsic,  Next: Random_Seed Intrinsic,  Prev: Rand Intrinsic,  Up: Table of Intrinsic Functions

Random_Number Intrinsic
.......................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Random_Number' to use this
name for an external procedure.


File: g77.info,  Node: Random_Seed Intrinsic,  Next: Range Intrinsic,  Prev: Random_Number Intrinsic,  Up: Table of Intrinsic Functions

Random_Seed Intrinsic
.....................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Random_Seed' to use this name
for an external procedure.


File: g77.info,  Node: Range Intrinsic,  Next: Real Intrinsic,  Prev: Random_Seed Intrinsic,  Up: Table of Intrinsic Functions

Range Intrinsic
...............

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Range' to use this name for an
external procedure.


File: g77.info,  Node: Real Intrinsic,  Next: RealPart Intrinsic,  Prev: Range Intrinsic,  Up: Table of Intrinsic Functions

Real Intrinsic
..............

     Real(A)

Real: `REAL' function.  The exact type is `REAL(KIND=1)' when argument
A is any type other than `COMPLEX', or when it is `COMPLEX(KIND=1)'.
When A is any `COMPLEX' type other than `COMPLEX(KIND=1)', this
intrinsic is valid only when used as the argument to `REAL()', as
explained below.

A: `INTEGER', `REAL', or `COMPLEX'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Converts A to `REAL(KIND=1)'.

   Use of `REAL()' with a `COMPLEX' argument (other than
`COMPLEX(KIND=1)') is restricted to the following case:

     REAL(REAL(A))

This expression converts the real part of A to `REAL(KIND=1)'.

   *Note RealPart Intrinsic::, for information on a GNU Fortran
intrinsic that extracts the real part of an arbitrary `COMPLEX' value.

   *Note REAL() and AIMAG() of Complex::, for more information.


File: g77.info,  Node: RealPart Intrinsic,  Next: Rename Intrinsic (subroutine),  Prev: Real Intrinsic,  Up: Table of Intrinsic Functions

RealPart Intrinsic
..................

     RealPart(Z)

RealPart: `REAL' function, the `KIND=' value of the type being that of
argument Z.

Z: `COMPLEX'; scalar; INTENT(IN).

Intrinsic groups: `gnu'.

Description:

   The real part of Z is returned, without conversion.

   *Note:* The way to do this in standard Fortran 90 is `REAL(Z)'.
However, when, for example, Z is `COMPLEX(KIND=2)', `REAL(Z)' means
something different for some compilers that are not true Fortran 90
compilers but offer some extensions standardized by Fortran 90 (such as
the `DOUBLE COMPLEX' type, also known as `COMPLEX(KIND=2)').

   The advantage of `REALPART()' is that, while not necessarily more or
less portable than `REAL()', it is more likely to cause a compiler that
doesn't support it to produce a diagnostic than generate incorrect code.

   *Note REAL() and AIMAG() of Complex::, for more information.


File: g77.info,  Node: Rename Intrinsic (subroutine),  Next: Repeat Intrinsic,  Prev: RealPart Intrinsic,  Up: Table of Intrinsic Functions

Rename Intrinsic (subroutine)
.............................

     CALL Rename(PATH1, PATH2, STATUS)

PATH1: `CHARACTER'; scalar; INTENT(IN).

PATH2: `CHARACTER'; scalar; INTENT(IN).

STATUS: `INTEGER(KIND=1)'; OPTIONAL; scalar; INTENT(OUT).

Intrinsic groups: `unix'.

Description:

   Renames the file PATH1 to PATH2.  A null character (`CHAR(0)') marks
the end of the names in PATH1 and PATH2--otherwise, trailing blanks in
PATH1 and PATH2 are ignored.  See `rename(2)'.  If the STATUS argument
is supplied, it contains 0 on success or a non-zero error code upon
return.

   Some non-GNU implementations of Fortran provide this intrinsic as
only a function, not as a subroutine, or do not support the (optional)
STATUS argument.

   For information on other intrinsics with the same name: *Note Rename
Intrinsic (function)::.


File: g77.info,  Node: Repeat Intrinsic,  Next: Reshape Intrinsic,  Prev: Rename Intrinsic (subroutine),  Up: Table of Intrinsic Functions

Repeat Intrinsic
................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Repeat' to use this name for an
external procedure.


File: g77.info,  Node: Reshape Intrinsic,  Next: RRSpacing Intrinsic,  Prev: Repeat Intrinsic,  Up: Table of Intrinsic Functions

Reshape Intrinsic
.................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Reshape' to use this name for
an external procedure.


File: g77.info,  Node: RRSpacing Intrinsic,  Next: RShift Intrinsic,  Prev: Reshape Intrinsic,  Up: Table of Intrinsic Functions

RRSpacing Intrinsic
...................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL RRSpacing' to use this name
for an external procedure.


File: g77.info,  Node: RShift Intrinsic,  Next: Scale Intrinsic,  Prev: RRSpacing Intrinsic,  Up: Table of Intrinsic Functions

RShift Intrinsic
................

     RShift(I, SHIFT)

RShift: `INTEGER' function, the `KIND=' value of the type being that of
argument I.

I: `INTEGER'; scalar; INTENT(IN).

SHIFT: `INTEGER'; scalar; INTENT(IN).

Intrinsic groups: `f2c'.

Description:

   Returns I shifted to the right SHIFT bits.

   Although similar to the expression `I/(2**SHIFT)', there are
important differences.  For example, the sign of the result is
undefined.

   Currently this intrinsic is defined assuming the underlying
representation of I is as a two's-complement integer.  It is unclear at
this point whether that definition will apply when a different
representation is involved.

   *Note RShift Intrinsic::, for the inverse of this function.

   *Note IShft Intrinsic::, for information on a more widely available
right-shifting intrinsic that is also more precisely defined.


File: g77.info,  Node: Scale Intrinsic,  Next: Scan Intrinsic,  Prev: RShift Intrinsic,  Up: Table of Intrinsic Functions

Scale Intrinsic
...............

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Scale' to use this name for an
external procedure.


File: g77.info,  Node: Scan Intrinsic,  Next: Second Intrinsic (function),  Prev: Scale Intrinsic,  Up: Table of Intrinsic Functions

Scan Intrinsic
..............

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Scan' to use this name for an
external procedure.


File: g77.info,  Node: Second Intrinsic (function),  Next: Second Intrinsic (subroutine),  Prev: Scan Intrinsic,  Up: Table of Intrinsic Functions

Second Intrinsic (function)
...........................

     Second()

Second: `REAL(KIND=1)' function.

Intrinsic groups: `unix'.

Description:

   Returns the process's runtime in seconds--the same value as the UNIX
function `etime' returns.

   For information on other intrinsics with the same name: *Note Second
Intrinsic (subroutine)::.


File: g77.info,  Node: Second Intrinsic (subroutine),  Next: Selected_Int_Kind Intrinsic,  Prev: Second Intrinsic (function),  Up: Table of Intrinsic Functions

Second Intrinsic (subroutine)
.............................

     CALL Second(SECONDS)

SECONDS: `REAL'; scalar; INTENT(OUT).

Intrinsic groups: `unix'.

Description:

   Returns the process's runtime in seconds in SECONDS--the same value
as the UNIX function `etime' returns.

   This routine is known from Cray Fortran.  *Note CPU_Time Intrinsic::
for a standard equivalent.

   For information on other intrinsics with the same name: *Note Second
Intrinsic (function)::.


File: g77.info,  Node: Selected_Int_Kind Intrinsic,  Next: Selected_Real_Kind Intrinsic,  Prev: Second Intrinsic (subroutine),  Up: Table of Intrinsic Functions

Selected_Int_Kind Intrinsic
...........................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Selected_Int_Kind' to use this
name for an external procedure.


File: g77.info,  Node: Selected_Real_Kind Intrinsic,  Next: Set_Exponent Intrinsic,  Prev: Selected_Int_Kind Intrinsic,  Up: Table of Intrinsic Functions

Selected_Real_Kind Intrinsic
............................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Selected_Real_Kind' to use
this name for an external procedure.


File: g77.info,  Node: Set_Exponent Intrinsic,  Next: Shape Intrinsic,  Prev: Selected_Real_Kind Intrinsic,  Up: Table of Intrinsic Functions

Set_Exponent Intrinsic
......................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Set_Exponent' to use this name
for an external procedure.


File: g77.info,  Node: Shape Intrinsic,  Next: Short Intrinsic,  Prev: Set_Exponent Intrinsic,  Up: Table of Intrinsic Functions

Shape Intrinsic
...............

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Shape' to use this name for an
external procedure.


File: g77.info,  Node: Short Intrinsic,  Next: Sign Intrinsic,  Prev: Shape Intrinsic,  Up: Table of Intrinsic Functions

Short Intrinsic
...............

     Short(A)

Short: `INTEGER(KIND=6)' function.

A: `INTEGER'; scalar; INTENT(IN).

Intrinsic groups: `unix'.

Description:

   Returns A with the fractional portion of its magnitude truncated and
its sign preserved, converted to type `INTEGER(KIND=6)'.

   If A is type `COMPLEX', its real part is truncated and converted,
and its imaginary part is disgregarded.

   *Note Int Intrinsic::.

   The precise meaning of this intrinsic might change in a future
version of the GNU Fortran language, as more is learned about how it is
used.


File: g77.info,  Node: Sign Intrinsic,  Next: Signal Intrinsic (subroutine),  Prev: Short Intrinsic,  Up: Table of Intrinsic Functions

Sign Intrinsic
..............

     Sign(A, B)

Sign: `INTEGER' or `REAL' function, the exact type being the result of
cross-promoting the types of all the arguments.

A: `INTEGER' or `REAL'; scalar; INTENT(IN).

B: `INTEGER' or `REAL'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns `ABS(A)*S', where S is +1 if `B.GE.0', -1 otherwise.

   *Note Abs Intrinsic::, for the function that returns the magnitude
of a value.


File: g77.info,  Node: Signal Intrinsic (subroutine),  Next: Sin Intrinsic,  Prev: Sign Intrinsic,  Up: Table of Intrinsic Functions

Signal Intrinsic (subroutine)
.............................

     CALL Signal(NUMBER, HANDLER, STATUS)

NUMBER: `INTEGER'; scalar; INTENT(IN).

HANDLER: Signal handler (`INTEGER FUNCTION' or `SUBROUTINE') or
dummy/global `INTEGER(KIND=1)' scalar.

STATUS: `INTEGER(KIND=7)'; OPTIONAL; scalar; INTENT(OUT).

Intrinsic groups: `unix'.

Description:

   If HANDLER is a an `EXTERNAL' routine, arranges for it to be invoked
with a single integer argument (of system-dependent length) when signal
NUMBER occurs.  If HANDLER is an integer, it can be used to turn off
handling of signal NUMBER or revert to its default action.  See
`signal(2)'.

   Note that HANDLER will be called using C conventions, so the value
of its argument in Fortran terms Fortran terms is obtained by applying
`%LOC()' (or LOC()) to it.

   The value returned by `signal(2)' is written to STATUS, if that
argument is supplied.  Otherwise the return value is ignored.

   Some non-GNU implementations of Fortran provide this intrinsic as
only a function, not as a subroutine, or do not support the (optional)
STATUS argument.

   *Warning:* Use of the `libf2c' run-time library function `signal_'
directly (such as via `EXTERNAL SIGNAL') requires use of the `%VAL()'
construct to pass an `INTEGER' value (such as `SIG_IGN' or `SIG_DFL')
for the HANDLER argument.

   However, while `CALL SIGNAL(SIGNUM, %VAL(SIG_IGN))' works when
`SIGNAL' is treated as an external procedure (and resolves, at link
time, to `libf2c''s `signal_' routine), this construct is not valid
when `SIGNAL' is recognized as the intrinsic of that name.

   Therefore, for maximum portability and reliability, code such
references to the `SIGNAL' facility as follows:

     INTRINSIC SIGNAL
     ...
     CALL SIGNAL(SIGNUM, SIG_IGN)

   `g77' will compile such a call correctly, while other compilers will
generally either do so as well or reject the `INTRINSIC SIGNAL'
statement via a diagnostic, allowing you to take appropriate action.

   For information on other intrinsics with the same name: *Note Signal
Intrinsic (function)::.


File: g77.info,  Node: Sin Intrinsic,  Next: SinH Intrinsic,  Prev: Signal Intrinsic (subroutine),  Up: Table of Intrinsic Functions

Sin Intrinsic
.............

     Sin(X)

Sin: `REAL' or `COMPLEX' function, the exact type being that of
argument X.

X: `REAL' or `COMPLEX'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns the sine of X, an angle measured in radians.

   *Note ASin Intrinsic::, for the inverse of this function.


File: g77.info,  Node: SinH Intrinsic,  Next: Sleep Intrinsic,  Prev: Sin Intrinsic,  Up: Table of Intrinsic Functions

SinH Intrinsic
..............

     SinH(X)

SinH: `REAL' function, the `KIND=' value of the type being that of
argument X.

X: `REAL'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns the hyperbolic sine of X.


File: g77.info,  Node: Sleep Intrinsic,  Next: Sngl Intrinsic,  Prev: SinH Intrinsic,  Up: Table of Intrinsic Functions

Sleep Intrinsic
...............

     CALL Sleep(SECONDS)

SECONDS: `INTEGER(KIND=1)'; scalar; INTENT(IN).

Intrinsic groups: `unix'.

Description:

   Causes the process to pause for SECONDS seconds.  See `sleep(2)'.


File: g77.info,  Node: Sngl Intrinsic,  Next: Spacing Intrinsic,  Prev: Sleep Intrinsic,  Up: Table of Intrinsic Functions

Sngl Intrinsic
..............

     Sngl(A)

Sngl: `REAL(KIND=1)' function.

A: `REAL(KIND=2)'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Archaic form of `REAL()' that is specific to one type for A.  *Note
Real Intrinsic::.


File: g77.info,  Node: Spacing Intrinsic,  Next: Spread Intrinsic,  Prev: Sngl Intrinsic,  Up: Table of Intrinsic Functions

Spacing Intrinsic
.................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Spacing' to use this name for
an external procedure.


File: g77.info,  Node: Spread Intrinsic,  Next: SqRt Intrinsic,  Prev: Spacing Intrinsic,  Up: Table of Intrinsic Functions

Spread Intrinsic
................

   This intrinsic is not yet implemented.  The name is, however,
reserved as an intrinsic.  Use `EXTERNAL Spread' to use this name for an
external procedure.


File: g77.info,  Node: SqRt Intrinsic,  Next: SRand Intrinsic,  Prev: Spread Intrinsic,  Up: Table of Intrinsic Functions

SqRt Intrinsic
..............

     SqRt(X)

SqRt: `REAL' or `COMPLEX' function, the exact type being that of
argument X.

X: `REAL' or `COMPLEX'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns the square root of X, which must not be negative.

   To calculate and represent the square root of a negative number,
complex arithmetic must be used.  For example, `SQRT(COMPLEX(X))'.

   The inverse of this function is `SQRT(X) * SQRT(X)'.


File: g77.info,  Node: SRand Intrinsic,  Next: Stat Intrinsic (subroutine),  Prev: SqRt Intrinsic,  Up: Table of Intrinsic Functions

SRand Intrinsic
...............

     CALL SRand(SEED)

SEED: `INTEGER'; scalar; INTENT(IN).

Intrinsic groups: `unix'.

Description:

   Reinitialises the generator with the seed in SEED.  *Note IRand
Intrinsic::.  *Note Rand Intrinsic::.


File: g77.info,  Node: Stat Intrinsic (subroutine),  Next: Stat Intrinsic (function),  Prev: SRand Intrinsic,  Up: Table of Intrinsic Functions

Stat Intrinsic (subroutine)
...........................

     CALL Stat(FILE, SARRAY, STATUS)

FILE: `CHARACTER'; scalar; INTENT(IN).

SARRAY: `INTEGER(KIND=1)'; DIMENSION(13); INTENT(OUT).

STATUS: `INTEGER(KIND=1)'; OPTIONAL; scalar; INTENT(OUT).

Intrinsic groups: `unix'.

Description:

   Obtains data about the given file FILE and places them in the array
SARRAY.  A null character (`CHAR(0)') marks the end of the name in
FILE--otherwise, trailing blanks in FILE are ignored.  The values in
this array are extracted from the `stat' structure as returned by
`fstat(2)' q.v., as follows:

  1. File mode

  2. Inode number

  3. ID of device containing directory entry for file

  4. Device id (if relevant)

  5. Number of links

  6. Owner's uid

  7. Owner's gid

  8. File size (bytes)

  9. Last access time

 10. Last modification time

 11. Last file status change time

 12. Preferred I/O block size

 13. Number of blocks allocated

   Not all these elements are relevant on all systems.  If an element
is not relevant, it is returned as 0.

   If the STATUS argument is supplied, it contains 0 on success or a
non-zero error code upon return.

   Some non-GNU implementations of Fortran provide this intrinsic as
only a function, not as a subroutine, or do not support the (optional)
STATUS argument.

   For information on other intrinsics with the same name: *Note Stat
Intrinsic (function)::.