ss="constructor">Scanf</span>.sscanf&nbsp;s&nbsp;<span class="string">"%_s&nbsp;=&nbsp;%i"</span>&nbsp;f</code> returns <code class="code">2</code>.</p>

<p>The field width is composed of an optional integer literal
    indicating the maximal width of the token to read.
    For instance, <code class="code">%6d</code> reads an integer, having at most 6 decimal digits;
    <code class="code">%4f</code> reads a float with at most 4 characters; and <code class="code">%8[\000-\255]</code>
    returns the next 8 