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| <a name="Extensions-to-namelist"></a> |
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| <a name="Extensions-to-namelist-1"></a> |
| <h4 class="subsection">6.1.3 Extensions to namelist</h4> |
| <a name="index-Namelist"></a> |
| |
| <p>GNU Fortran fully supports the Fortran 95 standard for namelist I/O |
| including array qualifiers, substrings and fully qualified derived types. |
| The output from a namelist write is compatible with namelist read. The |
| output has all names in upper case and indentation to column 1 after the |
| namelist name. Two extensions are permitted: |
| </p> |
| <p>Old-style use of ‘<samp>$</samp>’ instead of ‘<samp>&</samp>’ |
| </p><div class="smallexample"> |
| <pre class="smallexample">$MYNML |
| X(:)%Y(2) = 1.0 2.0 3.0 |
| CH(1:4) = "abcd" |
| $END |
| </pre></div> |
| |
| <p>It should be noted that the default terminator is ‘<samp>/</samp>’ rather than |
| ‘<samp>&END</samp>’. |
| </p> |
| <p>Querying of the namelist when inputting from stdin. After at least |
| one space, entering ‘<samp>?</samp>’ sends to stdout the namelist name and the names of |
| the variables in the namelist: |
| </p><div class="smallexample"> |
| <pre class="smallexample"> ? |
| |
| &mynml |
| x |
| x%y |
| ch |
| &end |
| </pre></div> |
| |
| <p>Entering ‘<samp>=?</samp>’ outputs the namelist to stdout, as if |
| <code>WRITE(*,NML = mynml)</code> had been called: |
| </p><div class="smallexample"> |
| <pre class="smallexample">=? |
| |
| &MYNML |
| X(1)%Y= 0.000000 , 1.000000 , 0.000000 , |
| X(2)%Y= 0.000000 , 2.000000 , 0.000000 , |
| X(3)%Y= 0.000000 , 3.000000 , 0.000000 , |
| CH=abcd, / |
| </pre></div> |
| |
| <p>To aid this dialog, when input is from stdin, errors send their |
| messages to stderr and execution continues, even if <code>IOSTAT</code> is set. |
| </p> |
| <p><code>PRINT</code> namelist is permitted. This causes an error if |
| <samp>-std=f95</samp> is used. |
| </p><div class="smallexample"> |
| <pre class="smallexample">PROGRAM test_print |
| REAL, dimension (4) :: x = (/1.0, 2.0, 3.0, 4.0/) |
| NAMELIST /mynml/ x |
| PRINT mynml |
| END PROGRAM test_print |
| </pre></div> |
| |
| <p>Expanded namelist reads are permitted. This causes an error if |
| <samp>-std=f95</samp> is used. In the following example, the first element |
| of the array will be given the value 0.00 and the two succeeding |
| elements will be given the values 1.00 and 2.00. |
| </p><div class="smallexample"> |
| <pre class="smallexample">&MYNML |
| X(1,1) = 0.00 , 1.00 , 2.00 |
| / |
| </pre></div> |
| |
| <p>When writing a namelist, if no <code>DELIM=</code> is specified, by default a |
| double quote is used to delimit character strings. If -std=F95, F2003, |
| or F2008, etc, the delim status is set to ’none’. Defaulting to |
| quotes ensures that namelists with character strings can be subsequently |
| read back in accurately. |
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