[chuck-users] negative zero

[Robert Poor]

I'm troubled by ChucK's handling of negative zero.  A variable set to  
-0.0 is indistinguishable from a variable set to 0.0, except in  
printing.  This is not a problem in everyday practice, but it seems  
likely that it will cause trouble when you pass to an external program.

[Why would you set a variable to -0.0 in the first place?  Try this:  
(-3.0 % 1.0) => float bar;]

Comments?
====================
0.0 => float foo;
-0.0 => float bar;

// even though foo and bar print differently...
<<< "foo = ", foo, " bar = ", bar >>>;

// in ChucK's eyes, they are both considered to be zero...
<<< "sgn(foo) = ", Std.sgn(foo), " sgn(bar) = ", Std.sgn(bar) >>>;

// and they are equal...
if (foo == bar) {
   <<< "equal" >>>;
}
====================
produces
====================
% chuck test.ck
foo =  0.000000  bar =  -0.000000
sgn(foo) =  0.000000  sgn(bar) =  0.000000
"equal" : (string)
====================