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| <title>The GNU Fortran Compiler: SQRT</title> |
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| <a name="SQRT-_002d_002d_002d-Square_002droot-function"></a> |
| <h3 class="section">8.232 <code>SQRT</code> — Square-root function</h3> |
| <a name="index-SQRT"></a> |
| <a name="index-DSQRT"></a> |
| <a name="index-CSQRT"></a> |
| <a name="index-ZSQRT"></a> |
| <a name="index-CDSQRT"></a> |
| <a name="index-root"></a> |
| <a name="index-square_002droot"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>SQRT(X)</code> computes the square root of <var>X</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 = SQRT(X)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>X</var></td><td width="70%">The type shall be <code>REAL</code> or |
| <code>COMPLEX</code>.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The return value is of type <code>REAL</code> or <code>COMPLEX</code>. |
| The kind type parameter is the same as <var>X</var>. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_sqrt |
| real(8) :: x = 2.0_8 |
| complex :: z = (1.0, 2.0) |
| x = sqrt(x) |
| z = sqrt(z) |
| end program test_sqrt |
| </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>SQRT(X)</code></td><td width="20%"><code>REAL(4) X</code></td><td width="20%"><code>REAL(4)</code></td><td width="25%">Fortran 95 and later</td></tr> |
| <tr><td width="20%"><code>DSQRT(X)</code></td><td width="20%"><code>REAL(8) X</code></td><td width="20%"><code>REAL(8)</code></td><td width="25%">Fortran 95 and later</td></tr> |
| <tr><td width="20%"><code>CSQRT(X)</code></td><td width="20%"><code>COMPLEX(4) X</code></td><td width="20%"><code>COMPLEX(4)</code></td><td width="25%">Fortran 95 and later</td></tr> |
| <tr><td width="20%"><code>ZSQRT(X)</code></td><td width="20%"><code>COMPLEX(8) X</code></td><td width="20%"><code>COMPLEX(8)</code></td><td width="25%">GNU extension</td></tr> |
| <tr><td width="20%"><code>CDSQRT(X)</code></td><td width="20%"><code>COMPLEX(8) X</code></td><td width="20%"><code>COMPLEX(8)</code></td><td width="25%">GNU extension</td></tr> |
| </table> |
| </dd> |
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