Question about double

hi everyone.
double i = 2.0;
double j = 1.1;
double result = i - j;
System.out.println("i - j = " + result);Regarding upside code, the result was expressed 0.8999999999999.
But I think that the result is 0.9.
Could you explain about this?

Search these forums and you will find this topic discussed and answered many times.
Read this: http://docs.sun.com/source/806-3568/ncg_goldberg.html
Floating point is stored as a binary floating point number and, just as not all numbers can be expressed exactly in decimal (1/3 for example), not all numbers can be expressed in binary exactly.

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