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Hi Ed, Largest signed `long long' is a bit pattern where all bits are set except the most significant bit: #define LL_MAX \ ((long long)((1ULL<<(8*sizeof(long long)-1))-1)) Largest unsigned long long is all bits set. In other words, the stuff above bit-ORed with the most significant bit: #define ULL_MAX \ ((unsigned long long)LL_MAX | (1ULL<<(8*sizeof(long long)-1))) This will work for any size of these datatypes as long as sizeof(unsigned long long)==sizeof(long long). You could also use the constants LLONG_MAX, LLONG_MIN, and ULLONG_MAX from <limits.h>. >>>>> "Ed" == Ed Hartnett <ed@xxxxxxxxxxxxxxxx> writes: Ed> Howdy all! Ed> What is the maximum long long on different platforms. Anyone know? Ed> In my header I have: Ed> #define X_INT64_MAX ((nc_int64)9223372036854775804) Ed> This gives me an error on AIX: Ed> "nc4hdf.c", line 2558.31: 1506-207 (W) Integer constant Ed> 9223372036854775804 out of range. Ed> Is there some standard way of determining what the largest signed and Ed> unsigned 64-bit int is? Ed> I figure one of you HDF5 people must know, since you have probably had Ed> the same problems. Ed> Thanks! Ed> -- Ed> Ed Hartnett -- ed@xxxxxxxxxxxxxxxx -- Robb Matzke L-159 | Ph: 812-967-6325 | I/O, I/O, it's off to disk we go, Lawrence Livermore | Fax: 812-967-6326 | A gigabyte to read or write, National Laboratory | Hrs: 3am-11am PDT | I/O, I/O.