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<a name="Introduction-to-Expressions"></a>
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<p>
Next: <a href="maxima_30.html#Nouns-and-Verbs" accesskey="n" rel="next">Nouns and Verbs</a>, Previous: <a href="maxima_28.html#Expressions" accesskey="p" rel="previous">Expressions</a>, Up: <a href="maxima_28.html#Expressions" accesskey="u" rel="up">Expressions</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="Introduction-to-Expressions-1"></a>
<h3 class="section">6.1 Introduction to Expressions</h3>
<p>There are a number of reserved words which should not be used as variable names.
Their use would cause a possibly cryptic syntax error.
</p>
<div class="example">
<pre class="example">integrate next from diff
in at limit sum
for and elseif then
else do or if
unless product while thru
step
</pre></div>
<p>Most things in Maxima are expressions. A sequence of expressions
can be made into an expression by separating them by commas and
putting parentheses around them. This is similar to the <b>C</b>
<i>comma expression</i>.
</p>
<div class="example">
<pre class="example">(%i1) x: 3$
(%i2) (x: x+1, x: x^2);
(%o2) 16
(%i3) (if (x > 17) then 2 else 4);
(%o3) 4
(%i4) (if (x > 17) then x: 2 else y: 4, y+x);
(%o4) 20
</pre></div>
<p>Even loops in Maxima are expressions, although the value they
return is the not too useful <code>done</code>.
</p>
<div class="example">
<pre class="example">(%i1) y: (x: 1, for i from 1 thru 10 do (x: x*i))$
(%i2) y;
(%o2) done
</pre></div>
<p>Whereas what you really want is probably to include a third
term in the <i>comma expression</i> which actually gives back the value.
</p>
<div class="example">
<pre class="example">(%i3) y: (x: 1, for i from 1 thru 10 do (x: x*i), x)$
(%i4) y;
(%o4) 3628800
</pre></div>
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Next: <a href="maxima_30.html#Nouns-and-Verbs" accesskey="n" rel="next">Nouns and Verbs</a>, Previous: <a href="maxima_28.html#Expressions" accesskey="p" rel="previous">Expressions</a>, Up: <a href="maxima_28.html#Expressions" accesskey="u" rel="up">Expressions</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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