123 lines
5.0 KiB
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123 lines
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HTML
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<title>The GNU Fortran Compiler: Variable FORMAT expressions</title>
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<a name="Variable-FORMAT-expressions"></a>
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<p>
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Next: <a href="Alternate-complex-function-syntax.html#Alternate-complex-function-syntax" accesskey="n" rel="next">Alternate complex function syntax</a>, Previous: <a href="ENCODE-and-DECODE-statements.html#ENCODE-and-DECODE-statements" accesskey="p" rel="prev">ENCODE and DECODE statements</a>, Up: <a href="Extensions-not-implemented-in-GNU-Fortran.html#Extensions-not-implemented-in-GNU-Fortran" accesskey="u" rel="up">Extensions not implemented in GNU Fortran</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Variable-FORMAT-expressions-1"></a>
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<h4 class="subsection">6.2.2 Variable <code>FORMAT</code> expressions</h4>
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<a name="index-FORMAT"></a>
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<p>A variable <code>FORMAT</code> expression is format statement which includes
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angle brackets enclosing a Fortran expression: <code>FORMAT(I<N>)</code>. GNU
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Fortran does not support this legacy extension. The effect of variable
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format expressions can be reproduced by using the more powerful (and
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standard) combination of internal output and string formats. For example,
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replace a code fragment like this:
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</p>
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<div class="smallexample">
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<pre class="smallexample"> WRITE(6,20) INT1
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20 FORMAT(I<N+1>)
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</pre></div>
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<p>with the following:
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</p>
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<div class="smallexample">
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<pre class="smallexample">c Variable declaration
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CHARACTER(LEN=20) FMT
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c
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c Other code here...
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c
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WRITE(FMT,'("(I", I0, ")")') N+1
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WRITE(6,FMT) INT1
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</pre></div>
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<p>or with:
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</p>
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<div class="smallexample">
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<pre class="smallexample">c Variable declaration
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CHARACTER(LEN=20) FMT
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c
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c Other code here...
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c
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WRITE(FMT,*) N+1
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WRITE(6,"(I" // ADJUSTL(FMT) // ")") INT1
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</pre></div>
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