/code> <strong><code>operator-</code></strong><code>(real x)</code><br>
Return the negation of the subtrahend x. <span class="math display">\[ \text{operator-}(x) = (-x)
\]</span></p>
<!-- real; operator+; (real x); -->
<p></p>
<p><code>real</code> <strong><code>operator+</code></strong><code>(real x)</code><br>
Return the value of x. <span class="math display">\[ \text{operator+}(x) = x \]</span></p>
</div>
</div>
            </section>

          </div>
        </div>
      </div>
<a href="logical-functio