TCL: convert negative integer to hexadecimal?

StackOverflow https://stackoverflow.com/questions/11849771

  •  25-06-2021
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Question

I want to convert signed integer to 32-bit hexadecimal. The following works fine for positive integer:

format %.8x $the_decimal_value

But for negative integer, I got 64-bit hexadecimal. For example, 99 is converted to 00000063, but -81 is converted to ffffffffffffffaf.

Anyone know how to get 32-bit hexadecimal from a negative integer?

Was it helpful?

Solution 

% set num -81
% format 0x%.8x [expr {$num & 0xFFFFFFFF}]
0xffffffaf

The only hint in the docs I can find is this.

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