According to the standard, negative zero exists but it is equal to positive zero. For almost all purposes, the two behave the same way and many consider the existence of a negative to be an implementation detail. There are, however, some functions that behave quite differently, namely division and atan2: #include <math.h> #include <stdio.h> int … Read more
-0 is not less than 0 or +0, both -0 < 0 and -0 < +0 returns False, you’re mixing the behavior of Math.min with the comparison of -0 with 0/+0. The specification of Math.min is clear on this point: b. If number is -0𝔽 and lowest is +0𝔽, set lowest to -0𝔽. Without this … Read more
The compiler cannot eliminate the addition of a floating-point positive zero because it is not an identity operation. By IEEE 754 rules, the result of adding +0. to −0. is not −0.; it is +0. The compiler may eliminate the subtraction of +0. or the addition of −0. because those are identity operations. For example, … Read more
You can assign a negative sign to a 0.0 float in Ruby because all IEEE 754 floating point numbers have a sign bit to indicate whether the number is positive or negative. Here are the binary representations of 2.5 and -2.5: [2.5].pack(‘f’).unpack1(‘b*’) #=> “00000000000000000000010000000010” [-2.5].pack(‘f’).unpack1(‘b*’) #=> “00000000000000000000010000000011” The last bit is the sign bit. Note … Read more
-0 is (generally) treated as 0 *******. It can result when a negative floating-point number is so close to zero that it can be considered 0 (to be clear, I’m referring to arithmetic underflow, and the results of the following computations are interpreted as being exactly ±0, not just really small numbers). e.g. System.out.println(-1 / … Read more