u should not rely on this number. You can
    however rely on the fact all of them are defined to represent negative
    values.
    </p><div class="variablelist"><dl class="variablelist"><dt id="ECPG-INFORMIX-CONSTANTS-ECPG-INFORMIX-NUM-OVERFLOW"><span class="term"><code class="literal">ECPG_INFORMIX_NUM_OVERFLOW</code></span> <a href="#ECPG-INFORMIX-CONSTANTS-ECPG-INFORMIX-NUM-OVERFLOW" class="id_link">#</a></dt><dd><p>
        Functions return this value if an overflow occurred in a
        calculation. 