Two's complement: Difference between revisions
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By default Rakus integers are arbitrary sized, theoretically of infinite length. You can't really take the twos complement of an infinitely long number; so, we need to specifically use fixed size integers.
There is a module available from the Raku ecosystem that provides fixed size integer support, named (appropriately enough.) [https://raku.land/
FixedInt supports fixed bit size integers, not only 8 bit, 16 bit, 32 bit or 64 bit, but ''ANY'' integer size. 22 bit, 35 bit, 191 bit, whatever.
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This is illustrated by running the following code:
<syntaxhighlight lang="
a = -a
System.print(a) // -0</syntaxhighlight>
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We can therefore emulate how two's complement works on ''signed'' 32 bit integers by using the bitwise complement operator '''~''' to flip the bits as follows:
<syntaxhighlight lang="
var pow31 = 2.pow(31)
var bs = [-pow31, -pow31+1, -2, -1, 0, 1, 2, pow31-2, pow31-1]
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