a simple query - The Tcl programming language

1b329 a simple query - The Tcl programming language

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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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