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<h1><font color="black"><a name="htoc16">Chapter&nbsp;2</a>&nbsp;&nbsp;Variables, expressions and statements</font></h1>
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<h2><font color="black"><a name="htoc17">2.1</a>&nbsp;&nbsp;Values and types</font></h2>
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<font color="black">A <b>value</b> is one of the basic things a program works with,
like a letter or a
number. The values we have seen so far
are <tt>1</tt>, <tt>2</tt>, and
<