** Start of listing of h3b.cc **
/* How did I build h3-cc.cgi? */

#include <stdlib.h>
#include <string.h>
#include "CGI-cc.h" // Warning, that's not a header, it's the whole file!!

int main() {
  CGI c; // Contains all the CGI info. See CGI-cc.h for access methods.
  char* br = "<br />";
  char* nl = "\n";
  char* qs;
  char* fn;
  char* ln;
  char* fav;

  qs = getenv("QUERY_STRING");
  c.start_html("Robert Maas CalRobert642@Yahoo.com",
	       "Test CGI Page- written using C++ Include file",
	       "white");
  std::cout << "The query string is: [" << qs << "]" << br << nl;
  if ((fn = c.copy_value("firstname")) == NULL) {
    cout << "Your form doesn't contain any [firstname] field." << br << nl;
  } else if ((ln = c.copy_value("lastname")) == NULL) {
    cout << "Your form doesn't contain any [lastname] field." << br << nl;
  } else if ((fav = c.copy_value("favorite number")) == NULL) {
    cout << "Your form doesn't contain any [favorite number] field."
	 << br << nl;
  } else {
    cout << "Do you prefer to be called '" << fn << " " << ln << "'"
	 << br << nl << "or rather '" << ln << ", " << fn << "' ?"
	 << br << nl;
    cout << "And is your favorite number really " << fav << " ?" << br << nl;
  }
  c.end_html();
}
** End of listing of h3b.cc **

Here is the directory entry for that source file:
-rw-------  1 rem  user  1212 Feb  9  2007 h3b.cc
   ^ Note user execute permission *not* needed for source files.

That gets compiled to a.out, but then renamed to something.cgi
so that it will be usable by remote users via CGI:
-rwx------  1 rem  user  11237 Jul 12  2005 h3-c++.cgi
   ^ Note user execute permission needed for all CGI programs.
(because compiled-C++ is native machine code running directly on machine)