a pair of number enclosed in parentheses
<p>Here is a block of code. Can anyone explain what it means to have a pair of numbers enclosed inside parentheses. (This is in C++.)</p>

<pre><code>    int a = 2, b = 2, c = 3, d = 1;
    if((a,b)&lt;(c,d))
        cout&lt;&lt;"case1"&lt;&lt;endl;
    else
        cout&lt;&lt;"case2";
</code></pre>
