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| <title>The GNU Fortran Compiler: ABS</title> |
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| <a name="ABS-_002d_002d_002d-Absolute-value"></a> |
| <h3 class="section">9.3 <code>ABS</code> — Absolute value</h3> |
| <a name="index-ABS"></a> |
| <a name="index-CABS"></a> |
| <a name="index-DABS"></a> |
| <a name="index-IABS"></a> |
| <a name="index-ZABS"></a> |
| <a name="index-CDABS"></a> |
| <a name="index-absolute-value"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>ABS(A)</code> computes the absolute value of <code>A</code>. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 77 and later, has overloads that are GNU extensions |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Elemental function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>RESULT = ABS(A)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>A</var></td><td width="70%">The type of the argument shall be an <code>INTEGER</code>, |
| <code>REAL</code>, or <code>COMPLEX</code>.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>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. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <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></div> |
| |
| </dd> |
| <dt><em>Specific names</em>:</dt> |
| <dd><table> |
| <tr><td width="20%">Name</td><td width="20%">Argument</td><td width="20%">Return type</td><td width="25%">Standard</td></tr> |
| <tr><td width="20%"><code>ABS(A)</code></td><td width="20%"><code>REAL(4) A</code></td><td width="20%"><code>REAL(4)</code></td><td width="25%">Fortran 77 and later</td></tr> |
| <tr><td width="20%"><code>CABS(A)</code></td><td width="20%"><code>COMPLEX(4) A</code></td><td width="20%"><code>REAL(4)</code></td><td width="25%">Fortran 77 and later</td></tr> |
| <tr><td width="20%"><code>DABS(A)</code></td><td width="20%"><code>REAL(8) A</code></td><td width="20%"><code>REAL(8)</code></td><td width="25%">Fortran 77 and later</td></tr> |
| <tr><td width="20%"><code>IABS(A)</code></td><td width="20%"><code>INTEGER(4) A</code></td><td width="20%"><code>INTEGER(4)</code></td><td width="25%">Fortran 77 and later</td></tr> |
| <tr><td width="20%"><code>ZABS(A)</code></td><td width="20%"><code>COMPLEX(8) A</code></td><td width="20%"><code>COMPLEX(8)</code></td><td width="25%">GNU extension</td></tr> |
| <tr><td width="20%"><code>CDABS(A)</code></td><td width="20%"><code>COMPLEX(8) A</code></td><td width="20%"><code>COMPLEX(8)</code></td><td width="25%">GNU extension</td></tr> |
| </table> |
| </dd> |
| </dl> |
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