<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=us-ascii" http-equiv=Content-Type> <META name=GENERATOR content="MSHTML 9.00.8112.16430"></HEAD> <BODY> <DIV><FONT size=2 face="Courier New"><SPAN class=305334813-08072011>Because my computer had a hard disk break down (or a controller breakdown, I hope) and reparation may last a month, I bought a dual 64 bit processor portable. At least the properties of the computer icon tell me so. However:</SPAN></FONT></DIV> <DIV><FONT size=2 face="Courier New"><SPAN class=305334813-08072011></SPAN></FONT> </DIV> <DIV><FONT size=2 face="Courier New"><SPAN class=305334813-08072011>#lang racket<BR>(let loop ((k 1))<BR>  (if (fixnum? k) (loop (* 2 k))<BR>      (string-length (number->string k 2)))) -> 31</SPAN></FONT></DIV> <DIV><FONT size=2 face="Courier New"><SPAN class=305334813-08072011></SPAN></FONT> </DIV> <DIV><FONT size=2 face="Courier New"><SPAN class=305334813-08072011>Documentation shows:</SPAN></FONT></DIV> <DIV><FONT size=2 face="Courier New"><SPAN class=305334813-08072011></SPAN></FONT> </DIV> <DIV><FONT size=2 face="Courier New"><SPAN class=305334813-08072011>Quote</SPAN></FONT></DIV> <DIV><SPAN class=305334813-08072011><FONT size=2 face="Courier New">A </FONT><A name=(tech._fixnum)></A><FONT size=2><FONT face="Courier New"><SPAN style="FONT-STYLE: italic">fixnum</SPAN> is a small exact integer. In this case, “small”depends on the platform. For a 32-bit machine, numbers that can be expressed in 30 bits plus a sign bit are represented as fixnums. On a 64-bit machine, 62 bits plus a sign bit are available.</FONT></FONT></SPAN></DIV> <DIV><SPAN class=305334813-08072011><FONT size=2 face="Courier New">Unquote</FONT></SPAN></DIV> <DIV><SPAN class=305334813-08072011><FONT size=2 face="Courier New"></FONT></SPAN> </DIV> <DIV><SPAN class=305334813-08072011><FONT size=2 face="Courier New">Can anyone shed some light on this. I am sure I am doing something wrong or I may interprete things wrongly. But what? I can imagine that Windows 7 is simulating a 64 bits machine on 32 bits hardware and Racket sees through it. I run a Samsung R540 with windows 7. My 64 bit Bullguard is running fine on my machine.</FONT></SPAN></DIV> <DIV><SPAN class=305334813-08072011><FONT size=2 face="Courier New"></FONT></SPAN> </DIV> <DIV><SPAN class=305334813-08072011><FONT size=2 face="Courier New">Thanks, Jos</FONT></SPAN></DIV></BODY></HTML>