- Use the %jd format and a cast to intmax_t to print an int64_t. - The return type of getopt() is an int, not a char. This fixes some warnings but there's still much more work to do here.
- Use the %jd format and a cast to intmax_t to print an int64_t. - The return type of getopt() is an int, not a char. This fixes some warnings but there's still much more work to do here.