A number that represents the MySQL client library version in format:
main_version*10000 + minor_version *100 + sub_version.
For example, 4.1.0 is returned as 40100.
This is useful to quickly determine the version of the client library to know if some capability exits.
/* We don't need a connection to determine
the version of mysql client library */
printf("Client library version: %d\n", mysqli_get_client_version());