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Posted to issues@commons.apache.org by "Luc Maisonobe (JIRA)" <ji...@apache.org> on 2009/01/17 00:07:59 UTC
[jira] Resolved: (MATH-238) MathUtils.gcd(u, v) fails when u and v
both contain a high power of 2
[ https://issues.apache.org/jira/browse/MATH-238?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Luc Maisonobe resolved MATH-238.
--------------------------------
Resolution: Fixed
fixed in trunk as of r73517
thanks for the report
> MathUtils.gcd(u, v) fails when u and v both contain a high power of 2
> ---------------------------------------------------------------------
>
> Key: MATH-238
> URL: https://issues.apache.org/jira/browse/MATH-238
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 2.0
> Reporter: Christian Semrau
> Priority: Minor
>
> The test at the beginning of MathUtils.gcd(u, v) for arguments equal to zero fails when u and v contain high enough powers of 2 so that their product overflows to zero.
> assertEquals(3 * (1<<15), MathUtils.gcd(3 * (1<<20), 9 * (1<<15)));
> Fix: Replace the test at the start of MathUtils.gcd()
> if (u * v == 0) {
> by
> if (u == 0 || v == 0) {
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