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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> &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 procedures required
+by the Fortran 95 and later supported standards, and a set of intrinsic
+procedures for backwards compatibility with G77.  Any conflict between
+a description here and a description in the Fortran standards 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=</samp> command-line option,
+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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+<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> &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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