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| <title>The GNU Fortran Compiler: SIGN</title> |
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| <a name="SIGN-_002d_002d_002d-Sign-copying-function"></a> |
| <h3 class="section">8.223 <code>SIGN</code> — Sign copying function</h3> |
| <a name="index-SIGN"></a> |
| <a name="index-ISIGN"></a> |
| <a name="index-DSIGN"></a> |
| <a name="index-sign-copying"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>SIGN(A,B)</code> returns the value of <var>A</var> with the sign of <var>B</var>. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 77 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Elemental function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>RESULT = SIGN(A, B)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>A</var></td><td width="70%">Shall be of type <code>INTEGER</code> or <code>REAL</code></td></tr> |
| <tr><td width="15%"><var>B</var></td><td width="70%">Shall be of the same type and kind as <var>A</var></td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The kind of the return value is that of <var>A</var> and <var>B</var>. |
| If <em>B\ge 0</em> then the result is <code>ABS(A)</code>, else |
| it is <code>-ABS(A)</code>. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_sign |
| print *, sign(-12,1) |
| print *, sign(-12,0) |
| print *, sign(-12,-1) |
| |
| print *, sign(-12.,1.) |
| print *, sign(-12.,0.) |
| print *, sign(-12.,-1.) |
| end program test_sign |
| </pre></div> |
| |
| </dd> |
| <dt><em>Specific names</em>:</dt> |
| <dd><table> |
| <tr><td width="20%">Name</td><td width="20%">Arguments</td><td width="20%">Return type</td><td width="25%">Standard</td></tr> |
| <tr><td width="20%"><code>SIGN(A,B)</code></td><td width="20%"><code>REAL(4) A, B</code></td><td width="20%"><code>REAL(4)</code></td><td width="25%">f77, gnu</td></tr> |
| <tr><td width="20%"><code>ISIGN(A,B)</code></td><td width="20%"><code>INTEGER(4) A, B</code></td><td width="20%"><code>INTEGER(4)</code></td><td width="25%">f77, gnu</td></tr> |
| <tr><td width="20%"><code>DSIGN(A,B)</code></td><td width="20%"><code>REAL(8) A, B</code></td><td width="20%"><code>REAL(8)</code></td><td width="25%">f77, gnu</td></tr> |
| </table> |
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