mysql_errno always returns 0 - mysql

Question

I am trying to connect to the server with a wrong user or password and as expected it fails but the mysql_errno always returns 0. is there something wrong with my mysql installation?.
EDIT: I am using a c program to connect.
int main(int argc, char *argv[]) {
MYSQL my_connection;
mysql_init(&my_connection);
if (mysql_real_connect(
&my_connection,
"localhost",
"rick",
"I do not know",
"foo", 0, NULL, 0)) {
printf("Connection success\n");
mysql_close(&my_connection);
} else {
fprintf(stderr, "Connection failed\n");
if (mysql_errno(&my_connection)) {
fprintf(stderr, "Connection error %d: %s\n",
mysql_errno(&my_connection), mysql_error(&my_connection));
}
}
return EXIT_SUCCESS;
}
IN the book the output is supposed to say error 1045:
In my case it is 0 and nothing but connection failed is printed.

Answer 1

mysql_errno() only reports errors from a valid connection.
The error number comes from the actual database. How can it retrieve these without a connection in the first place?
You'll notice in the API example, they don't bother with the error number for a failed connection
MYSQL mysql;
mysql_init(&mysql);
mysql_options(&mysql,MYSQL_READ_DEFAULT_GROUP,"your_prog_name");
if (!mysql_real_connect(&mysql,"host","user","passwd","database",0,NULL,0))
{
fprintf(stderr, "Failed to connect to database: Error: %s\n",
mysql_error(&mysql));
}