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