p>
        Add two decimal type values.
</p><pre class="synopsis">
int decadd(decimal *arg1, decimal *arg2, decimal *sum);
</pre><p>
        The function receives a pointer to the first operand of type decimal
        (<code class="literal">arg1</code>), a pointer to the second operand of type decimal
        (<code class="literal">arg2</code>) and a pointer to a value of type decimal that will
        contain the sum (<code class="literal">sum</code>). On success, the function returns 0.
        <code clas