How to print 如何輸出 int64_t，uint64_t的值 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