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== operator????

raymond yadao
Ranch Hand

Joined: Jan 29, 2001
Posts: 88
System.out.println(Math.min(-0.0,+0.0) == Math.max(0.0,+0.0));

why is this print true?
(min = -0.0) == (max = 0.0)???

another thing, how is the conversion of decimal in binary of negative numbers done?
48 = 11 0000
-48 = ???
Valentin Crettaz
Gold Digger
Sheriff

Joined: Aug 26, 2001
Posts: 7610
Math.min(-0.0,+0.0) returns -0.0
Math.max(0.0,+0.0) returns 0.0
From JLS 15.21.1 Numerical Equality Operators == and !=

...
Positive zero and negative zero are considered equal. Therefore, -0.0==0.0 is true, for example.
...

The conversion of negative decimal numbers to binary has been heavily discussed in the following threads:
http://www.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=24&t=014657
http://www.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=33&t=003578


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