intdoc.texi

gcc-2.95.3 Linux下最常用的C编译器

* Loc Intrinsic::       Address of entity in core.
@end ifset
@ifset familyF77
* Log Intrinsic::       Natural logarithm.
* Log10 Intrinsic::     Common logarithm.
@end ifset
@ifset familyF90
* Logical Intrinsic::   (Reserved for future use.)
@end ifset
@ifset familyF2U
* Long Intrinsic::      Conversion to @code{INTEGER(KIND=1)} (archaic).
@end ifset
@ifset familyF2C
* LShift Intrinsic::    Left-shift bits.
@end ifset
@ifset familyF2U
* LStat Intrinsic (subroutine):: Get file information.
* LStat Intrinsic (function):: Get file information.
* LTime Intrinsic::     Convert time to local time info.
@end ifset
@ifset familyF90
* MatMul Intrinsic::    (Reserved for future use.)
@end ifset
@ifset familyF77
* Max Intrinsic::       Maximum value.
* Max0 Intrinsic::      Maximum value (archaic).
* Max1 Intrinsic::      Maximum value (archaic).
@end ifset
@ifset familyF90
* MaxExponent Intrinsic:: (Reserved for future use.)
* MaxLoc Intrinsic::    (Reserved for future use.)
* MaxVal Intrinsic::    (Reserved for future use.)
@end ifset
@ifset familyF2U
* MClock Intrinsic::    Get number of clock ticks for process.
* MClock8 Intrinsic::   Get number of clock ticks for process.
@end ifset
@ifset familyF90
* Merge Intrinsic::     (Reserved for future use.)
@end ifset
@ifset familyF77
* Min Intrinsic::       Minimum value.
* Min0 Intrinsic::      Minimum value (archaic).
* Min1 Intrinsic::      Minimum value (archaic).
@end ifset
@ifset familyF90
* MinExponent Intrinsic:: (Reserved for future use.)
* MinLoc Intrinsic::    (Reserved for future use.)
* MinVal Intrinsic::    (Reserved for future use.)
@end ifset
@ifset familyF77
* Mod Intrinsic::       Remainder.
@end ifset
@ifset familyF90
* Modulo Intrinsic::    (Reserved for future use.)
@end ifset
@ifset familyMIL
* MvBits Intrinsic::    Moving a bit field.
@end ifset
@ifset familyF90
* Nearest Intrinsic::   (Reserved for future use.)
@end ifset
@ifset familyF77
* NInt Intrinsic::      Convert to @code{INTEGER} value rounded
                         to nearest whole number.
@end ifset
@ifset familyMIL
* Not Intrinsic::       Boolean NOT.
@end ifset
@ifset familyF2C
* Or Intrinsic::        Boolean OR.
@end ifset
@ifset familyF90
* Pack Intrinsic::      (Reserved for future use.)
@end ifset
@ifset familyF2U
* PError Intrinsic::    Print error message for last error.
@end ifset
@ifset familyF90
* Precision Intrinsic:: (Reserved for future use.)
* Present Intrinsic::   (Reserved for future use.)
* Product Intrinsic::   (Reserved for future use.)
@end ifset
@ifset familyVXT
* QAbs Intrinsic::      (Reserved for future use.)
* QACos Intrinsic::     (Reserved for future use.)
* QACosD Intrinsic::    (Reserved for future use.)
* QASin Intrinsic::     (Reserved for future use.)
* QASinD Intrinsic::    (Reserved for future use.)
* QATan Intrinsic::     (Reserved for future use.)
* QATan2 Intrinsic::    (Reserved for future use.)
* QATan2D Intrinsic::   (Reserved for future use.)
* QATanD Intrinsic::    (Reserved for future use.)
* QCos Intrinsic::      (Reserved for future use.)
* QCosD Intrinsic::     (Reserved for future use.)
* QCosH Intrinsic::     (Reserved for future use.)
* QDiM Intrinsic::      (Reserved for future use.)
* QExp Intrinsic::      (Reserved for future use.)
* QExt Intrinsic::      (Reserved for future use.)
* QExtD Intrinsic::     (Reserved for future use.)
* QFloat Intrinsic::    (Reserved for future use.)
* QInt Intrinsic::      (Reserved for future use.)
* QLog Intrinsic::      (Reserved for future use.)
* QLog10 Intrinsic::    (Reserved for future use.)
* QMax1 Intrinsic::     (Reserved for future use.)
* QMin1 Intrinsic::     (Reserved for future use.)
* QMod Intrinsic::      (Reserved for future use.)
* QNInt Intrinsic::     (Reserved for future use.)
* QSin Intrinsic::      (Reserved for future use.)
* QSinD Intrinsic::     (Reserved for future use.)
* QSinH Intrinsic::     (Reserved for future use.)
* QSqRt Intrinsic::     (Reserved for future use.)
* QTan Intrinsic::      (Reserved for future use.)
* QTanD Intrinsic::     (Reserved for future use.)
* QTanH Intrinsic::     (Reserved for future use.)
@end ifset
@ifset familyF90
* Radix Intrinsic::     (Reserved for future use.)
@end ifset
@ifset familyF2U
* Rand Intrinsic::      Random number.
@end ifset
@ifset familyF90
* Random_Number Intrinsic:: (Reserved for future use.)
* Random_Seed Intrinsic:: (Reserved for future use.)
* Range Intrinsic::     (Reserved for future use.)
@end ifset
@ifset familyF77
* Real Intrinsic::      Convert value to type @code{REAL(KIND=1)}.
@end ifset
@ifset familyGNU
* RealPart Intrinsic::  Extract real part of complex.
@end ifset
@ifset familyF2U
* Rename Intrinsic (subroutine):: Rename file.
@end ifset
@ifset familyBADU77
* Rename Intrinsic (function):: Rename file.
@end ifset
@ifset familyF90
* Repeat Intrinsic::    (Reserved for future use.)
* Reshape Intrinsic::   (Reserved for future use.)
* RRSpacing Intrinsic:: (Reserved for future use.)
@end ifset
@ifset familyF2C
* RShift Intrinsic::    Right-shift bits.
@end ifset
@ifset familyF90
* Scale Intrinsic::     (Reserved for future use.)
* Scan Intrinsic::      (Reserved for future use.)
@end ifset
@ifset familyVXT
* Secnds Intrinsic::    Get local time offset since midnight.
@end ifset
@ifset familyF2U
* Second Intrinsic (function):: Get CPU time for process in seconds.
* Second Intrinsic (subroutine):: Get CPU time for process
                         in seconds.
@end ifset
@ifset familyF90
* Selected_Int_Kind Intrinsic:: (Reserved for future use.)
* Selected_Real_Kind Intrinsic:: (Reserved for future use.)
* Set_Exponent Intrinsic:: (Reserved for future use.)
* Shape Intrinsic::     (Reserved for future use.)
@end ifset
@ifset familyF2U
* Short Intrinsic::     Convert to @code{INTEGER(KIND=6)} value
                         truncated to whole number.
@end ifset
@ifset familyF77
* Sign Intrinsic::      Apply sign to magnitude.
@end ifset
@ifset familyF2U
* Signal Intrinsic (subroutine):: Muck with signal handling.
@end ifset
@ifset familyBADU77
* Signal Intrinsic (function):: Muck with signal handling.
@end ifset
@ifset familyF77
* Sin Intrinsic::       Sine.
@end ifset
@ifset familyVXT
* SinD Intrinsic::      (Reserved for future use.)
@end ifset
@ifset familyF77
* SinH Intrinsic::      Hyperbolic sine.
@end ifset
@ifset familyF2U
* Sleep Intrinsic::     Sleep for a specified time.
@end ifset
@ifset familyF77
* Sngl Intrinsic::      Convert (archaic).
@end ifset
@ifset familyVXT
* SnglQ Intrinsic::     (Reserved for future use.)
@end ifset
@ifset familyF90
* Spacing Intrinsic::   (Reserved for future use.)
* Spread Intrinsic::    (Reserved for future use.)
@end ifset
@ifset familyF77
* SqRt Intrinsic::      Square root.
@end ifset
@ifset familyF2U
* SRand Intrinsic::     Random seed.
* Stat Intrinsic (subroutine):: Get file information.
* Stat Intrinsic (function):: Get file information.
@end ifset
@ifset familyF90
* Sum Intrinsic::       (Reserved for future use.)
@end ifset
@ifset familyF2U
* SymLnk Intrinsic (subroutine):: Make symbolic link in file system.
@end ifset
@ifset familyBADU77
* SymLnk Intrinsic (function):: Make symbolic link in file system.
@end ifset
@ifset familyF2U
* System Intrinsic (subroutine):: Invoke shell (system) command.
@end ifset
@ifset familyBADU77
* System Intrinsic (function):: Invoke shell (system) command.
@end ifset
@ifset familyF90
* System_Clock Intrinsic:: Get current system clock value.
@end ifset
@ifset familyF77
* Tan Intrinsic::       Tangent.
@end ifset
@ifset familyVXT
* TanD Intrinsic::      (Reserved for future use.)
@end ifset
@ifset familyF77
* TanH Intrinsic::      Hyperbolic tangent.
@end ifset
@ifset familyF2U
* Time Intrinsic (UNIX):: Get current time as time value.
@end ifset
@ifset familyVXT
* Time Intrinsic (VXT):: Get the time as a character value.
@end ifset
@ifset familyF2U
* Time8 Intrinsic::     Get current time as time value.
@end ifset
@ifset familyF90
* Tiny Intrinsic::      (Reserved for future use.)
* Transfer Intrinsic::  (Reserved for future use.)
* Transpose Intrinsic:: (Reserved for future use.)
* Trim Intrinsic::      (Reserved for future use.)
@end ifset
@ifset familyF2U
* TtyNam Intrinsic (subroutine):: Get name of terminal device for unit.
* TtyNam Intrinsic (function):: Get name of terminal device for unit.
@end ifset
@ifset familyF90
* UBound Intrinsic::    (Reserved for future use.)
@end ifset
@ifset familyF2U
* UMask Intrinsic (subroutine):: Set file creation permissions mask.
@end ifset
@ifset familyBADU77
* UMask Intrinsic (function):: Set file creation permissions mask.
@end ifset
@ifset familyF2U
* Unlink Intrinsic (subroutine):: Unlink file.
@end ifset
@ifset familyBADU77
* Unlink Intrinsic (function):: Unlink file.
@end ifset
@ifset familyF90
* Unpack Intrinsic::    (Reserved for future use.)
* Verify Intrinsic::    (Reserved for future use.)
@end ifset
@ifset familyF2C
* XOr Intrinsic::       Boolean XOR.
* ZAbs Intrinsic::      Absolute value (archaic).
* ZCos Intrinsic::      Cosine (archaic).
* ZExp Intrinsic::      Exponential (archaic).
@end ifset
@ifset familyVXT
* ZExt Intrinsic::      (Reserved for future use.)
@end ifset
@ifset familyF2C
* ZLog Intrinsic::      Natural logarithm (archaic).
* ZSin Intrinsic::      Sine (archaic).
* ZSqRt Intrinsic::     Square root (archaic).
@end ifset
@end menu

@ifset familyF2U
@node Abort Intrinsic
@subsubsection Abort Intrinsic
@cindex Abort intrinsic
@cindex intrinsics, Abort

@noindent
@example
CALL Abort()
@end example

@noindent
Intrinsic groups: @code{unix}.

@noindent
Description:

Prints a message and potentially causes a core dump via @code{abort(3)}.

@end ifset
@ifset familyF77
@node Abs Intrinsic
@subsubsection Abs Intrinsic
@cindex Abs intrinsic
@cindex intrinsics, Abs

@noindent
@example
Abs(@var{A})
@end example

@noindent
Abs: @code{INTEGER} or @code{REAL} function.
The exact type depends on that of argument @var{A}---if @var{A} is
@code{COMPLEX}, this function's type is @code{REAL}
with the same @samp{KIND=} value as the type of @var{A}.
Otherwise, this function's type is the same as that of @var{A}.

@noindent
@var{A}: @code{INTEGER}, @code{REAL}, or @code{COMPLEX}; scalar; INTENT(IN).

@noindent
Intrinsic groups: (standard FORTRAN 77).

@noindent
Description:

Returns the absolute value of @var{A}.

If @var{A} is type @code{COMPLEX}, the absolute
value is computed as:

@example
SQRT(REALPART(@var{A})**2, IMAGPART(@var{A})**2)
@end example

@noindent
Otherwise, it is computed by negating the @var{A} if
it is negative, or returning @var{A}.

@xref{Sign Intrinsic}, for how to explicitly
compute the positive or negative form of the absolute
value of an expression.

@end ifset
@ifset familyF2U
@node Access Intrinsic
@subsubsection Access Intrinsic
@cindex Access intrinsic
@cindex intrinsics, Access

@noindent
@example
Access(@var{Name}, @var{Mode})
@end example

@noindent
Access: @code{INTEGER(KIND=1)} function.

@noindent
@var{Name}: @code{CHARACTER}; scalar; INTENT(IN).

@noindent
@var{Mode}: @code{CHARACTER}; scalar; INTENT(IN).

@noindent
Intrinsic groups: @code{unix}.

@noindent
Description:

Checks file @var{Name} for accessibility in the mode specified by @var{Mode} and
returns 0 if the file is accessible in that mode, otherwise an error
code if the file is inaccessible or @var{Mode} is invalid.
See @code{access(2)}.
A null character (@samp{CHAR(0)}) marks the end of
the name in @var{Name}---otherwise,
trailing blanks in @var{Name} are ignored.
@var{Mode} may be a concatenation of any of the following characters:

@table @samp
@item r
Read permission

@item w
Write permission

@item x
Execute permission

@item @kbd{SPC}
Existence
@end table

@end ifset
@ifset familyASC
@node AChar Intrinsic
@subsubsection AChar Intrinsic
@cindex AChar intrinsic
@cindex intrinsics, AChar

@noindent
@example
AChar(@var{I})
@end example

@noindent
AChar: @code{CHARACTER*1} function.

@noindent
@var{I}: @code{INTEGER}; scalar; INTENT(IN).

@noindent
Intrinsic groups: @code{f2c}, @code{f90}.

@noindent
Description:

Returns the ASCII character corresponding to the
code specified by @var{I}.

@xref{IAChar Intrinsic}, for the inverse of this function.

@xref{Char Intrinsic}, for the function corresponding
to the system's native character set.

@end ifset
@ifset familyF77
@node ACos Intrinsic
@subsubsection ACos Intrinsic
@cindex ACos intrinsic
@cindex intrinsics, ACos

@noindent
@example
ACos(@var{X})
@end example

@noindent
ACos: @code{REAL} function, the @samp{KIND=} value of the type being that of argument @var{X}.

@noindent
@var{X}: @code{REAL}; scalar; INTENT(IN).

@noindent
Intrinsic groups: (standard FORTRAN 77).

@noindent
Description:

Returns the arc-cosine (inverse cosine) of @var{X}
in radians.

@xref{Cos Intrinsic}, for the inverse of this function.

@end ifset
@ifset familyVXT
@node ACosD Intrinsic
@subsubsection ACosD Intrinsic
@cindex ACosD intrinsic
@cindex intrinsics, ACosD

This intrinsic is not yet implemented.
The name is, however, reserved as an intrinsic.
Use @samp{EXTERNAL ACosD} to use this name for an
external procedure.

@end ifset
@ifset familyF90
@node AdjustL Intrinsic
@subsubsection AdjustL Intrinsic
@cindex AdjustL intrinsic
@cindex intrinsics, AdjustL

This intrinsic is not yet implemented.
The name is, however, reserved as an intrinsic.
Use @samp{EXTERNAL AdjustL} to use this name for an
external procedure.

@node AdjustR Intrinsic
@subsubsection AdjustR Intrinsic
@cindex AdjustR intrinsic
@cindex intrinsics, AdjustR

This intrinsic is not yet implemented.
The name is, however, reserved as an intrinsic.
Use @samp{EXTERNAL AdjustR} to use this name for an
external procedure.

@end ifset
@ifset familyF77
@node AImag Intrinsic
@subsubsection AImag Intrinsic
@cindex AImag intrinsic
@cindex intrinsics, AImag

@noindent
@example
AImag(@var{Z})
@end example

@noindent
AImag: @code{REAL} function.
This intrinsic is valid when argument @var{Z} is
@code{COMPLEX(KIND=1)}.
When @var{Z} is any other @code{COMPLEX} type,
this intrinsic is valid only when used as the argument to
@code{REAL()}, as explained below.

@noindent
@var{Z}: @code{COMPLEX}; scalar; INTENT(IN).

@noindent
Intrinsic groups: (standard FORTRAN 77).

@noindent
Description:

Returns the (possibly converted) imaginary part of @var{Z}.