usqrtsafe isn't

Charles Greathouse on Mon, 16 Nov 2009 06:30:24 +0100

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usqrtsafe isn't

To: pari-dev@list.cr.yp.to
Subject: usqrtsafe isn't
From: Charles Greathouse <charles.greathouse@case.edu>
Date: Mon, 16 Nov 2009 00:28:19 -0500
Delivery-date: Mon, 16 Nov 2009 06:30:25 +0100
Mailing-list: contact pari-dev-help@list.cr.yp.to; run by ezmlm

In writing a program using the Pari library today I was able to trace
a problem to usqrtsafe.  In particular,
usqrtsafe(18446744073709551615) = 4294967296
but 4294967296^2 = 18446744073709551616 > 18446744073709551615.

Charles Greathouse
Analyst/Programmer
Case Western Reserve University

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