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| <h3 class="section">8.212 <code>SCAN</code> — Scan a string for the presence of a set of characters</h3> |
| |
| <p><a name="index-SCAN-996"></a><a name="index-string_002c-find-subset-997"></a> |
| <dl> |
| <dt><em>Description</em>:<dd>Scans a <var>STRING</var> for any of the characters in a <var>SET</var> |
| of characters. |
| |
| <p>If <var>BACK</var> is either absent or equals <code>FALSE</code>, this function |
| returns the position of the leftmost character of <var>STRING</var> that is |
| in <var>SET</var>. If <var>BACK</var> equals <code>TRUE</code>, the rightmost position |
| is returned. If no character of <var>SET</var> is found in <var>STRING</var>, the |
| result is zero. |
| |
| <br><dt><em>Standard</em>:<dd>Fortran 95 and later, with <var>KIND</var> argument Fortran 2003 and later |
| |
| <br><dt><em>Class</em>:<dd>Elemental function |
| |
| <br><dt><em>Syntax</em>:<dd><code>RESULT = SCAN(STRING, SET[, BACK [, KIND]])</code> |
| |
| <br><dt><em>Arguments</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="15%"><var>STRING</var> </td><td valign="top" width="70%">Shall be of type <code>CHARACTER</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="15%"><var>SET</var> </td><td valign="top" width="70%">Shall be of type <code>CHARACTER</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="15%"><var>BACK</var> </td><td valign="top" width="70%">(Optional) shall be of type <code>LOGICAL</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="15%"><var>KIND</var> </td><td valign="top" width="70%">(Optional) An <code>INTEGER</code> initialization |
| expression indicating the kind parameter of the result. |
| <br></td></tr></table> |
| |
| <br><dt><em>Return value</em>:<dd>The return value is of type <code>INTEGER</code> and of kind <var>KIND</var>. If |
| <var>KIND</var> is absent, the return value is of default integer kind. |
| |
| <br><dt><em>Example</em>:<dd> |
| <pre class="smallexample"> PROGRAM test_scan |
| WRITE(*,*) SCAN("FORTRAN", "AO") ! 2, found 'O' |
| WRITE(*,*) SCAN("FORTRAN", "AO", .TRUE.) ! 6, found 'A' |
| WRITE(*,*) SCAN("FORTRAN", "C++") ! 0, found none |
| END PROGRAM |
| </pre> |
| <br><dt><em>See also</em>:<dd><a href="INDEX-intrinsic.html#INDEX-intrinsic">INDEX intrinsic</a>, <a href="VERIFY.html#VERIFY">VERIFY</a> |
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