unsigned long long conflict with uint64_t? [duplicate]

Answer 1

This is from stdint.h for GCC 4.8:

#if __WORDSIZE == 64
typedef unsigned long int   uint64_t;
#else
__extension__
typedef unsigned long long int  uint64_t;
#endif

So:

So unsigned long long is the same as uint64_t in the 32bit compliation but not in 64 bit compliation?

Yes.