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<p>&nbsp;<p>
<hr noshade size="5">
<h2><a name="Prec"></a>
Prec
</h2>

Sets and gets the precision for real and complex
computations in the shell.

<p><p>

<h3>
Syntax:
</h3>
<pre>Prec(n);
Prec();</pre>

<p>

<table>
<tr>
<td>integer</td>
<td><pre>  n  </pre></td>
<td></td>
</tr>
</table>

<p>


See also:&nbsp;&nbsp;<a href="kashref.html#OrderPrec">OrderPrec</a>

<p>

<h3>
Description:
</h3>
All real and complex computations in the shell are performed in a
global precision. The <tt> Prec</tt> function sets and gets this
global precision. Remark that the global precision has <b> no</b>
influence at all on computations done in internal <sf> KANT</sf>
functions. The only way to set this is using <tt> OrderPrec</tt>.
<ul>
<li>[<tt> Prec(n)</tt>] Sets the global precision to <tt> n</tt> and returns the
new global precision. This is the smallest positive integer which
is divisible by 4 and greater than or equal to  max(<tt> n</tt>, 12).
<li>[<tt> Prec()</tt>] Returns the current global precision.
</ul>

<p><p>

<p>
<hr>
<p>
<h3>
Example:
</h3>
Compute Euler's constant with different precisions: 
<pre>

kash> e;
2.718281828459045235360287471352662497757247093699
kash> Prec(100);
100
kash> e;
2.7182818284590452353602874713526624977572470936999595749669676277240766303535\
47594571382178525166

</pre>

<p>


<hr>

<p>
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