error in code

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# include <stdio.h>
# include <stdlib.h>
# include <libpq-fe.h>

int main()
{
PGresult *result;
PGconn *conn;
int feild;
printf("successful");
conn = PQconnectdb ("ashok");
result = PQexec (conn, "select * from bill");
feild = PQntuples (result);
printf("%d",feild);
PQclear (result);
PQfinish (conn);
printf("hello");
return 1;

}

I written a code and compile with following command, it complied and
create 'a.out' file but when i run the a.out it give nothing.
command:- "gcc program.c -I /usr/include/pgsql/include -L
/usr/lib/libpq.a -lpq"

plz help me.
Ashok