g N"
  read .num.
  skip .num.
end if  
</font></PRE>
</TD>
</TR>
</TABLE>
<p>

<!-- @node   Built-in Variables, Synonyms, User Variables, Variables -->
<a name="Built-inVariables" ></a>
<h3>10.4.3: Built-in variables</h3>

Built-in variables (see <a href="BuiltinIndex.html#IndexofBuiltins">Index of Builtins</a>) have names which begin and
end with <b>two</b> periods.  For example, `<font color="#82140F"><code>..xsize..</code></font>' is the width
of the x-axis in centimetres.  You may use these variables a