<code>(!a) &amp;&amp; b</code>, and <code>a &lt; b || c &gt;= d &amp;&amp; e != f</code> as <code>(a &lt; b) || (((c &gt;= d) &amp;&amp; (e != f)))</code>.</p>
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<p><code>int</code> <strong><code>operator!</code></strong><code>(int x)</code><br></p>
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<p><code>int</code> <strong><code>operator!</code></strong><code>(real x)</code><br>
Return 1 if x is zero and 0 otherwise. <span class="math display">\[ \text{operator!}(x) =
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