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Re: newbie libpq question...

From: Michael Fuhr <mike(at)fuhr(dot)org>
To: Doug Homoelle <homoelle(at)ll(dot)mit(dot)edu>
Cc: pgsql-interfaces(at)postgresql(dot)org
Subject: Re: newbie libpq question...
Date: 2004-11-14 01:23:41
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-interfaces
On Mon, Nov 08, 2004 at 05:23:59PM -0500, Doug Homoelle wrote:
> 	res = PQexec(conn, "select blah blah blah");
> 	test_int=PQntuples(res);
> 	fprintf(stdout,"number of rows: %f\n",test_int);
> 	test_int=PQnfields(res);
> 	fprintf(stdout,"number of cols: %f\n",test_int);
> where "blah blah blah" is the selection criteria, I get zero rows and
> zero columns.

You're using floating-point (%f) conversions to print integers; use
%d or %i instead.  Some compilers have options to warn you of such
mistakes -- with gcc, for example, you can use -Wall.

Michael Fuhr

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