How to print how to output Int64_ t，uint64_ The value of T in C

For int64_t type:

int64_t t;
printf("%"PRId64"\n", t);

for uint64_t type:

uint64_t t;
printf("%"PRIu64"\n", t);

you can also use PRIx64 to print in hexadecimal.
These macros are defined in inttypes.h