How to printf a 64-bit integer as hex? [duplicate]
The warning from your compiler is telling you that your format specifier doesn't match the data type you're passing to it.
Try using %lx or %llx. For more portability, include inttypes.h and use the PRIx64 macro.
For example: printf("val = 0x%" PRIx64 "\n", val); (note that it's string concatenation)
Edit: Use printf("val = 0x%" PRIx64 "\n", val); instead.
Try printf("val = 0x%llx\n", val);. See the printf manpage:
ll (ell-ell). A following integer conversion corresponds to a long long int or unsigned long long int argument, or a following n conversion corresponds to a pointer to a long long int argument.
Edit: Even better is what @M_Oehm wrote: There is a specific macro for that, because unit64_t is not always a unsigned long long: PRIx64 see also this stackoverflow answer