<html lang="en"> <head> <title>ABS - The GNU Fortran Compiler</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="The GNU Fortran Compiler"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Intrinsic-Procedures.html#Intrinsic-Procedures" title="Intrinsic Procedures"> <link rel="prev" href="ABORT.html#ABORT" title="ABORT"> <link rel="next" href="ACCESS.html#ACCESS" title="ACCESS"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. 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Copies published by the Free Software Foundation raise funds for GNU development.--> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="ABS"></a> <p> Next: <a rel="next" accesskey="n" href="ACCESS.html#ACCESS">ACCESS</a>, Previous: <a rel="previous" accesskey="p" href="ABORT.html#ABORT">ABORT</a>, Up: <a rel="up" accesskey="u" href="Intrinsic-Procedures.html#Intrinsic-Procedures">Intrinsic Procedures</a> <hr> </div> <h3 class="section">8.3 <code>ABS</code> — Absolute value</h3> <p><a name="index-ABS-350"></a><a name="index-CABS-351"></a><a name="index-DABS-352"></a><a name="index-IABS-353"></a><a name="index-ZABS-354"></a><a name="index-CDABS-355"></a><a name="index-absolute-value-356"></a> <dl> <dt><em>Description</em>:<dd><code>ABS(A)</code> computes the absolute value of <code>A</code>. <br><dt><em>Standard</em>:<dd>Fortran 77 and later, has overloads that are GNU extensions <br><dt><em>Class</em>:<dd>Elemental function <br><dt><em>Syntax</em>:<dd><code>RESULT = ABS(A)</code> <br><dt><em>Arguments</em>:<dd> <p><table summary=""><tr align="left"><td valign="top" width="15%"><var>A</var> </td><td valign="top" width="70%">The type of the argument shall be an <code>INTEGER</code>, <code>REAL</code>, or <code>COMPLEX</code>. <br></td></tr></table> <br><dt><em>Return value</em>:<dd>The return value is of the same type and kind as the argument except the return value is <code>REAL</code> for a <code>COMPLEX</code> argument. <br><dt><em>Example</em>:<dd> <pre class="smallexample"> program test_abs integer :: i = -1 real :: x = -1.e0 complex :: z = (-1.e0,0.e0) i = abs(i) x = abs(x) x = abs(z) end program test_abs </pre> <br><dt><em>Specific names</em>:<dd> <p><table summary=""><tr align="left"><td valign="top" width="20%">Name </td><td valign="top" width="20%">Argument </td><td valign="top" width="20%">Return type </td><td valign="top" width="25%">Standard <br></td></tr><tr align="left"><td valign="top" width="20%"><code>ABS(A)</code> </td><td valign="top" width="20%"><code>REAL(4) A</code> </td><td valign="top" width="20%"><code>REAL(4)</code> </td><td valign="top" width="25%">Fortran 77 and later <br></td></tr><tr align="left"><td valign="top" width="20%"><code>CABS(A)</code> </td><td valign="top" width="20%"><code>COMPLEX(4) A</code> </td><td valign="top" width="20%"><code>REAL(4)</code> </td><td valign="top" width="25%">Fortran 77 and later <br></td></tr><tr align="left"><td valign="top" width="20%"><code>DABS(A)</code> </td><td valign="top" width="20%"><code>REAL(8) A</code> </td><td valign="top" width="20%"><code>REAL(8)</code> </td><td valign="top" width="25%">Fortran 77 and later <br></td></tr><tr align="left"><td valign="top" width="20%"><code>IABS(A)</code> </td><td valign="top" width="20%"><code>INTEGER(4) A</code> </td><td valign="top" width="20%"><code>INTEGER(4)</code> </td><td valign="top" width="25%">Fortran 77 and later <br></td></tr><tr align="left"><td valign="top" width="20%"><code>ZABS(A)</code> </td><td valign="top" width="20%"><code>COMPLEX(8) A</code> </td><td valign="top" width="20%"><code>COMPLEX(8)</code> </td><td valign="top" width="25%">GNU extension <br></td></tr><tr align="left"><td valign="top" width="20%"><code>CDABS(A)</code> </td><td valign="top" width="20%"><code>COMPLEX(8) A</code> </td><td valign="top" width="20%"><code>COMPLEX(8)</code> </td><td valign="top" width="25%">GNU extension <br></td></tr></table> </dl> </body></html>