Name: dsC58869 Date: 12/02/97



The method java.lang.Math.abs(float floatPozitiveZero) works
wrong with pozitive zero parameter.
It returns NEGATIVE zero instead pozitive zero
(see Java Language Specification 20.11.23).


This bug was introduced in JDK1.2.

==== Here is the test demonstrating the bug ====

public class Test{
    public static void main(String[] args){
float floatPozitiveZero = 0.0F;
System.out.println(java.lang.Math.abs(floatPozitiveZero));
if((new Float(java.lang.Math.abs(floatPozitiveZero))).equals(new Float(0.0))){
System.out.println("OKAY");
return;
}
if((new Float(java.lang.Math.abs(floatPozitiveZero))).equals(new Float(-0.0))){
System.out.println("failed: abs(positiveZero) equals negativeZero");
return;
}
System.out.println("failed: see JLS 20.11.23");
return;
    }
}

==== Here is the output of the test ====

-0.0
failed: abs(positiveZero) equals negativeZero

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Name: dsC58869 Date: 01/14/98



The method java.lang.Math.abs(double) has the same problem.

see also bug 4098041

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