Why java gives wrong answer

float f=40.3f;System.out.println(f%4);The answer for above must be 0.3 but java gives 0.29999924WHY?(This answer is ok for small calculations but it may give wrong answers for large calculations)

[230 byte] By [chamila1986a] at [2007-11-27 4:58:45]

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# 1

http://mindprod.com/jgloss/floatingpoint.html

prometheuzza at 2007-7-12 10:14:44 >

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# 2

http://en.wikipedia.org/wiki/Floating_pointSee the part on "Accuracy Problems"

masijade.a at 2007-7-12 10:14:44 >

# 3

because Java is no Oracle...Java gives the correct answer, but you asked it the wrong question.

jwentinga at 2007-7-12 10:14:44 >

# 4

> The answer for above must be 0.3Nope.~

yawmarka at 2007-7-12 10:14:44 >

# 5

This is a well-known problem with Java. Only C# and PL/C are known to give correct answers.Sheesh!Read this: http://docs.sun.com/source/806-3568/ncg_goldberg.html

filestreama at 2007-7-12 10:14:44 >

# 6

> float f=40.3f;

> System.out.println(f%4);

> The answer for above must be 0.3 but java gives

> 0.29999924

> WHY?

> (This answer is ok for small calculations but it may

> give wrong answers for large calculations)

Use BigDecimal with MathContext or roll your own Fraction class- this way any repeating decimal is represented exactly.

Message was edited by:

snic.snac

snic.snaca at 2007-7-12 10:14:44 >

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