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At the risk of being just one of several people to answer... >>>>> Karl M Hegbloom writes: KMH> I'm still learning C as well as scheme. Can someone help me KMH> understand this bit of code, please? [...] KMH> ... Why does it first << 8 and then right away do >> 8, KMH> recompute and compare like that? How could the value change? (x << 8) >> 8 == x with the top 8 bits cleared -- Gordon Matzigkeit <gord@fig.org> //\ I'm a FIG (http://www.fig.org/) Lovers of freedom, unite! \// I use GNU (http://www.gnu.org/) Copyright (C) 1998 FIG.org; the creator offers you this gift and wants it to remain free. See http://www.fig.org/freedom.html for details. This work may be copied, modified and distributed under the GNU General Public License (GPL). See http://www.gnu.org/copyleft/gpl.html.