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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
a simple query

Posted by technocrat2004 (technocrat2004), 27 March 2006
Hi friends,

Can any one explain for the following output

% set a [format "%u" -200]
4294967096

My intesion is to convert the input to unsigned integer

Posted by admin (Graham Ellis), 27 March 2006
Yes, take the bit pattern of a signed integer of -200 (1's compliment) it is 11111111111111111111111100111000

As an unsigned interger, that works out as 4294967096, which is 200 short of 2 to the power 32.

If you want to strip off the - sign, then use the abs function:

Code:
% set val -200
-200
% set val [expr abs($val)]
200
%



Posted by technocrat2004 (technocrat2004), 29 March 2006
thank you Graham, thank you very much..



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