all bits zero?

[Jan Christiaan van Winkel]

>From article <16237 at haddock.ima.isc.com>, by karl at haddock.ima.isc.com (Karl Heuer):
> In article <2108 at gmdzi.UUCP> wittig at gmdzi.UUCP (Georg Wittig) writes:
>>Does ANSI C require that in the internal representation of the integer
>>constant ``0'' all bits are zero?
> 
> Assuming it's not in a pointer context--in which case it would have been a
> null pointer constant, not an integer constant, despite having the same
> spelling--yes.  Non-negative integers, signed or unsigned, whether formed by

And how about floats/double-s? I know the IEEE standard says that an exponent
of all zeroes signifies the number 0.0, but how about other float notations?