Isqrt (integer square root) of X: Difference between revisions
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</lang>
This version of the core word does not require locals.
<lang>:
>r 0 1 begin dup r@ > 0= while 4 * repeat
begin \ find a power of 4 greater than TORS
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dup 0< if drop 2/ else r> drop >r 2/ over + then swap
repeat drop r> ( sqrt rem)
;
: isqrt-mod sqrt-rem swap ;</lang>
{{Out}}
<pre>
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