[MATH-252] Fraction.comparTo returns 0 for some differente fractions

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.2
• Fix Version/s: 2.0
• Assignee: Luc Maisonobe
• Reporter: Luc Maisonobe
• Created: 29/Mar/09 16:50
• Updated: 23/Apr/09 02:26
• Resolved: 29/Mar/09 16:52

Description

If two different fractions evaluate to the same double due to limited precision,
the compareTo methode returns 0 as if they were identical.

// value is roughly PI - 3.07e-18
Fraction pi1 = new Fraction(1068966896, 340262731);

// value is roughly PI + 1.936e-17
Fraction pi2 = new Fraction( 411557987, 131002976);

System.out.println(pi1.doubleValue() - pi2.doubleValue()); // exactly 0.0 due to limited IEEE754 precision
System.out.println(pi1.compareTo(pi2)); // display 0 instead of a negative value