On 12 okt 2006, at 15:41, Пётр Косаревский wrote:
In the othe case, if the user is supposed to understand, that he looks at some representation of binary representation of a real number, "-0.000" obviously means "little negative number".
No, it means the value 0, but with a negative sign. The value "-0" is representable in an exact way on any IEEE standard-compliant fpu. The reason is that fpu's have a separate bit to store the sign. So even if the mantissa and exponent show that it's the value zero, the sign bit can still be one (meaning that it's a negative zero). And for some fpu calculations this even matters.
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