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Next: <a href="maxima_281.html#Gentran-Option-Variables" accesskey="n" rel="next">Gentran Option Variables</a>, Previous: <a href="maxima_279.html#Functions-for-Gentran" accesskey="p" rel="previous">Functions for Gentran</a>, Up: <a href="maxima_277.html#gentran_002dpkg" accesskey="u" rel="up">gentran-pkg</a> [<a href="maxima_toc.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="maxima_423.html#Function-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Gentran-Mode-Switches-1"></a>
<h3 class="section">61.3 Gentran Mode Switches</h3>
<a name="Item_003a-gentran_002fdefvr_002ffortran"></a><dl>
<dt><a name="index-fortran-1"></a>Option variable: <strong>fortran</strong></dt>
<dd><a name="Item_003a-gentran_002fdefvr_002fratfor"></a></dd><dt><a name="index-ratfor"></a>Option variable: <strong>ratfor</strong></dt>
<dd><a name="Item_003a-gentran_002fdefvr_002fc"></a></dd><dt><a name="index-c"></a>Option variable: <strong>c</strong></dt>
<dd><p>Default: off
</p>
<p>These mode switches change the default mode of Maxima from evaluation to
translation. They can be turned on and off with the gentran commands
gentran_on and gentran_off. Each time a new Maxima session is started
up, the system is in evaluation mode. It prints a prompt on the user’s
terminal screen and waits for an expression or statement to be entered.
It then proceeds to evaluate the expression, prints a new prompt, and
waits for the user to enter another expression or statement. This mode
can be changed to translation mode by turning on either the fortran,
ratfor or c switches. After one of these switches is turned on and until
it is turned off, every expression or statement entered by the user is
translated into the corresponding language just as if it had been given
as an argument to the gentran command. Each of the special functions
that can be used from within a call to gentran can be used at the top
level until the switch is turned off.
</p></dd></dl>
<a name="Item_003a-gentran_002fdefvr_002fgendecs"></a><dl>
<dt><a name="index-gendecs-1"></a>Option variable: <strong>gendecs</strong></dt>
<dd><p>Default: on
</p>
<p>When the gendecs switch is turned on, gentran generates type
declarations whenever possible. When gendecs is switched off, type
declarations are not generated. Instead, type information is stored in
gentran’s symbol table but is not retrieved in the form of declarations
unless and until either the gendecs command is called or the gendecs
flag is switched back. <strong>Note</strong>: Generated declarations may often
be placed in an inappropriate place (<em>e.g.</em> in the middle of
executable fortran code). Therefore the gendecs flag is turned off
during processing of templates by <strong>gentranin</strong>.
</p></dd></dl>
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Next: <a href="maxima_281.html#Gentran-Option-Variables" accesskey="n" rel="next">Gentran Option Variables</a>, Previous: <a href="maxima_279.html#Functions-for-Gentran" accesskey="p" rel="previous">Functions for Gentran</a>, Up: <a href="maxima_277.html#gentran_002dpkg" accesskey="u" rel="up">gentran-pkg</a> [<a href="maxima_toc.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="maxima_423.html#Function-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
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