Well, thank you bill and Forsyth. i'm posting here the source code: http://www.freewebtown.com/phao/t.c (it is very small)
and the `time PROGRAM' output: (under 'other' OS) % cc t.c % time a.out 2.86user 0.09system 0:02.97elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (80major+792minor)pagefaults 0swaps % (under Plan9) % 8c -FV t.c % 8l -o t t.8 % time t 37.69u 0.00s 44.43r t if it can help. But two guys have answer that it can be compiler optimation. and if it is that. It is all ok.
