implicitly call the get function.  Similarly, 
typing <tt>$Foo = 4</tt> would call the underlying set function to change
the value.
</p>

<H3><a name="Scripting_nn6">4.2.3 Constants</a></H3>


<p>
In many cases, a C program or library may define a large collection of
constants.  For example:
</p>

<div class="code"><pre>
#define RED   0xff0000
#define BLUE  0x0000ff
#define GREEN 0x00ff00
</pre></div>
<p>
To make constants available, their values can be stored in scripting
language variables such as <tt>$RE