d enclose a sequence of characters in double-quotes (i.e. <code class="language-c++ highlighter-rouge"><span class="s">"hello"</span></code> not '<code class="language-c++ highlighter-rouge"><span class="n">hello</span></code>'). There are helpful functions in <a href="https://web.stanford.edu/dept/cs_edu/resources/cslib_docs/strlib.html" title="Documentation for strlib.h">strlib.h</a> to aid you with converting between the two, including the <code class="language-c++ highlighter-rouge"><span class="n">char