AN> <SPAN CLASS="keyword">false</SPAN>;
        <SPAN CLASS="keyword">if</SPAN> (c != <SPAN CLASS="literal">'\n'</SPAN>)
            ++col_no_;
        <SPAN CLASS="keyword">else</SPAN>
            col_no_ = 0;
        <SPAN CLASS="keyword">return</SPAN> <SPAN CLASS="keyword">true</SPAN>;
    }</PRE>

<P>This function attempts to write the character <CODE>c</CODE> to the given <A HREF="../concepts/sink.html">Sink</A> and updates the column count if successful. Using <CODE>put_char</CODE>, you can implement 