Well, thank you bill and Forsyth. <br>
<br>
i&#39;m posting here the source code: <br>
<a href="http://www.freewebtown.com/phao/t.c">http://www.freewebtown.com/phao/t.c</a>&nbsp; (it is very small)<br>
<br>
and the `time PROGRAM&#39; output:<br>
<br>
(under &#39;other&#39; OS)<br>
% cc t.c<br>
% time a.out<br>
2.86user 0.09system 0:02.97elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k<br>
0inputs+0outputs (80major+792minor)pagefaults 0swaps<br>
%<br>
<br>
<br>
(under Plan9)<br>
% 8c -FV t.c<br>
% 8l -o t t.8<br>
% time t<br>
37.69u 0.00s 44.43r t<br>
<br>
if it can help. But two guys have answer that it can be compiler optimation. and if it is that. It is all ok.<br>