General question on determining type limits

[Steve Dondley]

Hi,

I'm having trouble determining the right macro name for the maximum value of
an unsigned long long integer.  I looked in the /usr/include/limits.h file
(is this even the right file to look in?) to see what the macro name might
be and found ULONG_LONG_MAX and ULLONG_MAX.  However, when I try to print
these values in a program, they come back as undefined.

So if I were to determine this value, how would I do so without looking at
the gcc manual or posting a question to a mailing list?

Thanks.