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    <p>If you have a Fortran 2003 compiler, the intrinsic module <a href="http://fortranwiki.org/fortran/show/iso_fortran_env" rel="noreferrer"><code>iso_fortran_env</code></a> defines the variables <code>input_unit</code>, <code>output_unit</code> and <code>error_unit</code> which point to standard in, standard out and standard error respectively.</p> <p>I tend to use something like</p> <pre><code>#ifdef f2003 use, intrinsic :: iso_fortran_env, only : stdin=&gt;input_unit, &amp; stdout=&gt;output_unit, &amp; stderr=&gt;error_unit #else #define stdin 5 #define stdout 6 #define stderr 0 #endif </code></pre> <p>in my input/output routines. Although this of course means <a href="http://fortranwiki.org/fortran/show/Preprocessors" rel="noreferrer">preprocessing</a> your source file (to do this with <code>ifort</code>, use the <code>-fpp</code> flag when compiling your source code or change the source file extension from <code>.f</code> to <code>.F</code> or from <code>.f90</code> to <code>.F90</code>).</p> <p>An alternative to this would be to write your own, non-intrinsic, <code>iso_fortran_env</code> module (if you don't have a Fortran 2003 compiler)<del>, as discussed <a href="http://old.nabble.com/iso_fortran_env-td6041849.html" rel="noreferrer">here</a></del> (this link has died since this answer was posted). In this example they use a module:</p> <pre><code>module iso_fortran_env ! Nonintrinsic version for Lahey/Fujitsu Fortran for Linux. ! See Subclause 13.8.2 of the Fortran 2003 standard. implicit NONE public integer, parameter :: Character_Storage_Size = 8 integer, parameter :: Error_Unit = 0 integer, parameter :: File_Storage_Size = 8 integer, parameter :: Input_Unit = 5 integer, parameter :: IOSTAT_END = -1 integer, parameter :: IOSTAT_EOR = -2 integer, parameter :: Numeric_Storage_Size = 32 integer, parameter :: Output_Unit = 6 end module iso_fortran_env </code></pre> <p>As noted in other answers, 0, 5 and 6 are <em>usually</em> <code>stderr</code>, <code>stdin</code> and <code>stdout</code> (this is true for <code>ifort</code> on Linux) but this is <strong>not</strong> defined by the Fortran standard. Using the <code>iso_fortran_env</code> module is the correct way to portably write to these units.</p>
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    1. POStandard input and output units in Fortran 90?
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    1. POStandard input and output units in Fortran 90?
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    1. COUnfortunately I don't have a 2003 compatible compiler; I'm in fortran 90.
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    2. CO@Pureferret So you can just use one of the alternative methods which I suggest. Also recent `ifort` versions support parts of the 2003 standard including `iso_fortran_env`.
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    3. COI tried this and it didn't work, the compiler said everything in your first block was 'bad preprocessor syntax' (I think) I haven't tried your second block yet, but if @tpg2114's solution doesn't work, I'm not sure why/how your solution would work.
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