add C/C++ syntax highlighting

editor.html

@@ -21,6 +21,7 @@
           <option value="php">PHP Document</option>
           <option value="java">Java Document</option>
           <option value="ruby">Ruby Document</option>
+          <option value="c_cpp">C++ Document</option>
           <option value="plain">Text Document</option>
         </select>
       </td>
@@ -76,6 +77,7 @@
           <option value="php">PHP</option>
           <option value="java">Java</option>
           <option value="ruby">Ruby</option>
+          <option value="c_cpp">C/C++ Document</option>
         </select>
       </td>
       <td align="right">
@@ -221,6 +223,21 @@ def fact(n)
 end
 
 puts fact(ARGV[0].to_i)
+</script>
+
+<script type="text/editor" id="cpptext">// compound assignment operators
+
+#include <iostream>
+using namespace std;
+
+int main ()
+{
+  int a, b=3; /* foobar */
+  a = b;
+  a+=2; // equivalent to a=a+2
+  cout << a;
+  return 0;
+}
 </script>
 
   <input id="cockpitInput" type="text"/>