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1.1*100=? 1.11*100=?

Liu Zhixiang
Ranch Hand

Joined: Aug 12, 2006
Posts: 32
Hello everyone!
Just like subject!Why the result is not 110 and 111,but 110.00000000000001 etc?
Why the capability of Javascript's Math is poor?


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Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 41838
    
  63
It's not JavaScript that's poor at math, it's computers in general. The reason is that math is performed base 2, not base 10, and few floating point numbers have an exact representation in base 2. All the details (which apply to all languages, not just Java or JavaScript) can be found in two articles linked in #20 in the Java Beginners FAQ.


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Alec Lee
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Joined: Jan 28, 2004
Posts: 569
How do we achieve exact floating point calculation in Javascript? Are there any BigDecimal equivalent classes ?
 
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