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| <title>The GNU Fortran Compiler: ICHAR</title> |
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| <a name="ICHAR-_002d_002d_002d-Character_002dto_002dinteger-conversion-function"></a> |
| <h3 class="section">8.120 <code>ICHAR</code> — Character-to-integer conversion function</h3> |
| <a name="index-ICHAR"></a> |
| <a name="index-conversion_002c-to-integer-2"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>ICHAR(C)</code> returns the code for the character in the first character |
| position of <code>C</code> in the system’s native character set. |
| The correspondence between characters and their codes is not necessarily |
| the same across different GNU Fortran implementations. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 95 and later, with <var>KIND</var> argument Fortran 2003 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Elemental function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>RESULT = ICHAR(C [, KIND])</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>C</var></td><td width="70%">Shall be a scalar <code>CHARACTER</code>, with <code>INTENT(IN)</code></td></tr> |
| <tr><td width="15%"><var>KIND</var></td><td width="70%">(Optional) An <code>INTEGER</code> initialization |
| expression indicating the kind parameter of the result.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>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. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_ichar |
| integer i |
| i = ichar(' ') |
| end program test_ichar |
| </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>ICHAR(C)</code></td><td width="20%"><code>CHARACTER C</code></td><td width="20%"><code>INTEGER(4)</code></td><td width="25%">Fortran 77 and later</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Note</em>:</dt> |
| <dd><p>No intrinsic exists to convert between a numeric value and a formatted |
| character string representation – for instance, given the |
| <code>CHARACTER</code> value <code>'154'</code>, obtaining an <code>INTEGER</code> or |
| <code>REAL</code> value with the value 154, or vice versa. Instead, this |
| functionality is provided by internal-file I/O, as in the following |
| example: |
| </p><div class="smallexample"> |
| <pre class="smallexample">program read_val |
| integer value |
| character(len=10) string, string2 |
| string = '154' |
| |
| ! Convert a string to a numeric value |
| read (string,'(I10)') value |
| print *, value |
| |
| ! Convert a value to a formatted string |
| write (string2,'(I10)') value |
| print *, string2 |
| end program read_val |
| </pre></div> |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="ACHAR.html#ACHAR">ACHAR</a>, <a href="CHAR.html#CHAR">CHAR</a>, <a href="IACHAR.html#IACHAR">IACHAR</a> |
| </p> |
| </dd> |
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