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    copied!<p>Ok, the code does now seem like it works as expected:</p> <pre><code>#include &lt;iostream&gt; #include &lt;fstream&gt; using namespace::std; struct Node { string fileName; Node *link; }; bool contains (Node *&amp;flist, string &amp;name) { Node *tempNode = *&amp;flist; while (tempNode != 0) { cout &lt;&lt; "Searching in \"" &lt;&lt; flist-&gt;fileName; cout &lt;&lt; "\" for \"" &lt;&lt; name &lt;&lt; "\"" &lt;&lt; endl; if ( tempNode-&gt;fileName == name) { return true; } else { tempNode = tempNode-&gt;link; } } return false; } Node* getLastNode (Node *&amp;flist) { Node *tempNode = *&amp;flist; while (tempNode != 0) { tempNode = tempNode-&gt;link; } return tempNode; } string getFileName(string oneLine) { char doubleQuote; doubleQuote = oneLine[9]; if (doubleQuote == '\"') { string sub = oneLine.substr(10); //getting the file name string::size_type n = sub.size(); sub = sub.substr(0,n-1); return sub; } return ""; } void process( istream &amp;in, ostream &amp;out, Node *&amp;flist ) { cout &lt;&lt; "Start of process: " &lt;&lt; flist-&gt;fileName &lt;&lt; endl &lt;&lt; endl; string oneLine; while (1) { cout &lt;&lt; "Input include statement: "; getline(in, oneLine); if (oneLine == "STOP") return; string::size_type loc = oneLine.find("#include",0); if (loc != string::npos) { //found one line starting with "#include" string name; name = getFileName(oneLine); if (name == "") { cout &lt;&lt; "Couldn't find filename, skipping line..." &lt;&lt; endl; continue; } if (contains(flist, name)) { //contains recursive include cerr &lt;&lt; "Uh, oh! Recursive include of file " &lt;&lt; name &lt;&lt; endl; exit(-1); } else { cerr &lt;&lt; "No recursive include" &lt;&lt; endl; } }//if cout &lt;&lt; endl; }//while } int main( int argc, char *argv[] ) { Node* fileList = new Node; istream *infile = &amp;cin; // default value ostream *outfile = &amp;cout; // default value fileList-&gt;fileName = "Input"; // default value switch ( argc ) { case 3: outfile = new ofstream( argv[2] ); // open the outfile file if ( outfile-&gt;fail() ) { cerr &lt;&lt; "Can't open output file " &lt;&lt; argv[2] &lt;&lt; endl; exit( -1 ); } // FALL THROUGH to handle input file case 2: infile = new ifstream( argv[1] ); // open the input file if ( infile-&gt;fail() ) { cerr &lt;&lt; "Can't open input file " &lt;&lt; argv[1] &lt;&lt; endl; exit( -1 ); } else { fileList-&gt;fileName = argv[1]; cout &lt;&lt; "in main: " &lt;&lt; fileList-&gt;fileName &lt;&lt; endl; } // FALL THROUGH case 1: // use cin and cout break; default: // too many arguments cerr &lt;&lt; "Usage: " &lt;&lt; argv[0] &lt;&lt; " [ input-file [ output-file ] ]" &lt;&lt; endl; exit( -1 ); // TERMINATE! } process(*infile, *outfile, fileList); // do something if ( infile != &amp;cin ) delete infile; // close file, do not delete cin! if ( outfile != &amp;cout ) delete outfile; // close file, do not delete cout! } </code></pre>
 

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