
<pre class="example">(%i1) askinteger(n,integer);
Is n an integer?
yes;
(%o1)                          yes
(%i2) askinteger(e,even);
Is e an even number?
yes;
(%o2)                          yes
(%i3) facts();
(%o3)           [kind(n, integer), kind(e, even)]
(%i4) declare(f,integervalued);
(%o4)                         done
(%i5) askinteger(f(x));
(%o5)                          yes
</pre></dd></dl>

<p><a name="asksign"></a>
</p><dl>
<dt><u>Funktion:</u> <b>asksign</b><i> (<var>expr</var>)</i>
<a name="IDX