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 <a name="Introduction-to-Intrinsics"></a>
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 <p>
 Next: <a href="ABORT.html#ABORT" accesskey="n" rel="next">ABORT</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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 <hr>
 <a name="Introduction-to-intrinsic-procedures"></a>
 <h3 class="section">8.1 Introduction to intrinsic procedures</h3>

 <p>The intrinsic procedures provided by GNU Fortran include all of the
 intrinsic procedures required by the Fortran 95 standard, a set of
 intrinsic procedures for backwards compatibility with G77, and a
 selection of intrinsic procedures from the Fortran 2003 and Fortran 2008
 standards.  Any conflict between a description here and a description in
 either the Fortran 95 standard, the Fortran 2003 standard or the Fortran
 2008 standard is unintentional, and the standard(s) should be considered
 authoritative.
 </p>
 <p>The enumeration of the <code>KIND</code> type parameter is processor defined in
 the Fortran 95 standard.  GNU Fortran defines the default integer type and
 default real type by <code>INTEGER(KIND=4)</code> and <code>REAL(KIND=4)</code>,
 respectively.  The standard mandates that both data types shall have
 another kind, which have more precision.  On typical target architectures
 supported by <code>gfortran</code>, this kind type parameter is <code>KIND=8</code>.
 Hence, <code>REAL(KIND=8)</code> and <code>DOUBLE PRECISION</code> are equivalent.
 In the description of generic intrinsic procedures, the kind type parameter
 will be specified by <code>KIND=*</code>, and in the description of specific
 names for an intrinsic procedure the kind type parameter will be explicitly
 given (e.g., <code>REAL(KIND=4)</code> or <code>REAL(KIND=8)</code>).  Finally, for
 brevity the optional <code>KIND=</code> syntax will be omitted.
 </p>
 <p>Many of the intrinsic procedures take one or more optional arguments.
 This document follows the convention used in the Fortran 95 standard,
 and denotes such arguments by square brackets.
 </p>
 <p>GNU Fortran offers the <samp>-std=f95</samp> and <samp>-std=gnu</samp> options,
 which can be used to restrict the set of intrinsic procedures to a
 given standard.  By default, <code>gfortran</code> sets the <samp>-std=gnu</samp>
 option, and so all intrinsic procedures described here are accepted.  There
 is one caveat.  For a select group of intrinsic procedures, <code>g77</code>
 implemented both a function and a subroutine.  Both classes
 have been implemented in <code>gfortran</code> for backwards compatibility
 with <code>g77</code>.  It is noted here that these functions and subroutines
 cannot be intermixed in a given subprogram.  In the descriptions that follow,
 the applicable standard for each intrinsic procedure is noted.
 </p>


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	<a name="Introduction-to-Intrinsics"></a>
	<div class="header">
	<p>
	Next: <a href="ABORT.html#ABORT" accesskey="n" rel="next">ABORT</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a>   [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
	</div>
	<hr>
	<a name="Introduction-to-intrinsic-procedures"></a>
	<h3 class="section">8.1 Introduction to intrinsic procedures</h3>

	<p>The intrinsic procedures provided by GNU Fortran include all of the
	intrinsic procedures required by the Fortran 95 standard, a set of
	intrinsic procedures for backwards compatibility with G77, and a
	selection of intrinsic procedures from the Fortran 2003 and Fortran 2008
	standards. Any conflict between a description here and a description in
	either the Fortran 95 standard, the Fortran 2003 standard or the Fortran
	2008 standard is unintentional, and the standard(s) should be considered
	authoritative.
	</p>
	<p>The enumeration of the <code>KIND</code> type parameter is processor defined in
	the Fortran 95 standard. GNU Fortran defines the default integer type and
	default real type by <code>INTEGER(KIND=4)</code> and <code>REAL(KIND=4)</code>,
	respectively. The standard mandates that both data types shall have
	another kind, which have more precision. On typical target architectures
	supported by <code>gfortran</code>, this kind type parameter is <code>KIND=8</code>.
	Hence, <code>REAL(KIND=8)</code> and <code>DOUBLE PRECISION</code> are equivalent.
	In the description of generic intrinsic procedures, the kind type parameter
	will be specified by <code>KIND=*</code>, and in the description of specific
	names for an intrinsic procedure the kind type parameter will be explicitly
	given (e.g., <code>REAL(KIND=4)</code> or <code>REAL(KIND=8)</code>). Finally, for
	brevity the optional <code>KIND=</code> syntax will be omitted.
	</p>
	<p>Many of the intrinsic procedures take one or more optional arguments.
	This document follows the convention used in the Fortran 95 standard,
	and denotes such arguments by square brackets.
	</p>
	<p>GNU Fortran offers the <samp>-std=f95</samp> and <samp>-std=gnu</samp> options,
	which can be used to restrict the set of intrinsic procedures to a
	given standard. By default, <code>gfortran</code> sets the <samp>-std=gnu</samp>
	option, and so all intrinsic procedures described here are accepted. There
	is one caveat. For a select group of intrinsic procedures, <code>g77</code>
	implemented both a function and a subroutine. Both classes
	have been implemented in <code>gfortran</code> for backwards compatibility
	with <code>g77</code>. It is noted here that these functions and subroutines
	cannot be intermixed in a given subprogram. In the descriptions that follow,
	the applicable standard for each intrinsic procedure is noted.
	</p>


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	Next: <a href="ABORT.html#ABORT" accesskey="n" rel="next">ABORT</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a>   [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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