0003568: [FIX] Fraction>>asFloat does not answer nearest floating point number

Mantis - Squeak
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ID:	Category:	Severity:	Reproducibility:	Date Submitted:	Last Update:
3568	Kernel	minor	always	05-07-06 16:30	09-01-08 18:27

Reporter:	nicolas cellier	Platform:
Assigned To:		OS:
Priority:	normal	OS Version:
Status:	closed	Product Version:	3.9
Product Build:		Resolution:	fixed
Projection:	none
ETA:	none	Fixed in Version:	3.10

Summary:	0003568: [FIX] Fraction>>asFloat does not answer nearest floating point number
Description:	Current implementation can accumulate round off errors. Comment states that ideally, it should answer nearest floating point number... I join a test and a patch for this, and round to nearest even according to IEEE 754 default rounding mode. Patch http://bugs.impara.de/view.php?id=3564 [^] concerning Integer>>asFloat should be applied first, so this one can work correctly.
Steps To Reproduce:
Additional Information:	Fraction need not being reduced for this algorithm to apply. So, the new asFloat algorithm can be used to convert decimal representations to binary representations (Number readFrom: ), without spending too much time in gcd algorithm...
Relationships
Attached Files:	Kernel-Number-Fraction-asFloat-Test.1.cs [^] (878 bytes) 05-07-06 17:08 Kernel-Number-Fraction-asFloat-Patch.2.cs [^] (1,852 bytes) 05-07-06 17:09 Kernel-Number-Fraction-asFloat-Patch.3.cs [^] (1,877 bytes) 01-10-07 05:33 Kernel-Number-Fraction-asFloat-Test.2.cs [^] (1,441 bytes) 01-10-07 05:40

Notes