the most negative value for the int type of <code>x</code>, the quotient
<code>q = x / -1</code> is equal to <code>x</code> (and <code>r = 0</code>)
due to two's-complement <a href="#Integer_overflow">integer overflow</a>:
</p>

<pre>
                         x, q
int8                     -128
int16                  -32768
int32             -2147483648
int64    -9223372036854775808