note LanX For good reasons operators in Perl do type conversions!<P><P> <LI> <c>==, + - * </c> and so on do <I>numification</I> so <C>undef</C> is considered 0<P><P> <LI> <C>eq</C>, <c>.</c> and so on do <I>stringification</I> so undef is considered empty string <c>""</c>.<P><P> Anyway using <C>warnings</C> you'll often get "<c>Use of uninitialized value</c>" messages.<P><P> I do not understand what your intentions are, but if you wanna test for <C>undef</C> use the designated functions [doc://defined] or <c>//</c><P><P> <H5> EDIT<P></H5><P> [doc://perlop#Equality-Operators] in perlop<P><P> <pre> Binary "==" returns true if the left argument is <B>numerically</B> equal to the right argument. ... Binary "eq" returns true if the left argument is <B>stringwise</B> equal to the right argument. </pre><P><P> <!-- Node text goes above. Div tags should contain sig only --> <div class="pmsig"><div class="pmsig-708738"> <p>Cheers Rolf </div></div><P><P> 1016083 1016083