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In article <4d4pg7$3ot@news.dx.net> robmc@shol.com (Rob McCafferty) writes:
<snip>
   I believe C assumes numeric constants are signed.  Try using 65535U.

Unsuffixed decimal constants are signed unless a long is insufficient
to hold them, in which case they are unsigned. (If they don't fit into
an unsigned long, it is an error).

For octal and hexadecimal, they are signed; except if they fit into an
unsigned int or unsigned long, but not into the corresponding signed
type. 

<snip>
   >How do you use literal constants bigger than words e.g. how would you use
   >the literal constant 1000000 without getting the 'constant out of range'
   >warning/error?

   Again, C assumes constants are int unless you tell it otherwise.  Make this
   1000000L.

An ANSI C compiler has to interpret 1000000 and 1000000L identically
if 1000000 > MAX_INT (because it must fit into an unsigned int, there
is no possibility of it being an error).

ANSI C compilers assume unsufixed constants to be ints, _unless_ they
do not fit into an int. In this case, long and unsigned long are
tried. For octal and hexadecimal constants, unsigned int is tried
before trying signed and unsigned longs.

Cheers
Tanmoy
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