** Start of listing of h2.cc **
#include <iostream>
#include <ctime>
#include <cstdlib>
#include <cstring>

main() {
  time_t t;
  struct tm* ptm;
  char* sTime;
  int slen;
  char* ip;
  char* path;
  char *rmstr;
  char *qus;
  char qt = '"';

  std::cout << "Content-type: text/plain\n\n";

  rmstr = getenv("REQUEST_METHOD");
  if (rmstr == NULL) {
    std::cout << "Request method returned NULL, why??\n";
    return -1;
  } else {
    std::cout << "The request method is: [" << rmstr << "]\n";
  }

  if (strcmp(rmstr,"POST") == 0) {
    std::cout << "*** POST method not yet implemented\n";
    return -1;
  } else if (strcmp(rmstr,"GET") == 0) {
    qus = getenv("QUERY_STRING");
    std::cout << "The query string is: [" << qus << "]\n";
  } else {
    std::cout << "*** Unknown request method, neither GET nor POST\n";
    return -1;
  }
  std::cout << "* End of debug output.\n\n";

  if (strstr(qus,"date") == NULL) {
    std::cout << "You didn't ask for " << qt << "date" << qt <<
      " this time.\n";
  } else {
    std::cout << "The string " << qt << "date" << qt <<
      " occurred, so here it is:\n";
    t = time(NULL);
    ptm = localtime(&t);
    sTime = asctime(ptm);
    slen = strlen(sTime);
    sTime[slen-1] = sTime[slen]; /* Copy null byte to clobber newline. */
    slen = strlen(sTime);
    std::cout << "The time is " << sTime << " in California.\n";
  }
  std::cout << "\n";

  if (strstr(qus,"IP") != NULL) {
    ip = getenv("REMOTE_ADDR");
    std::cout << "The IP number " << ip;
    std::cout << " is where your client/browser is located.\n";
  } else if (strstr(qus,"ip") != NULL) {
    std::cout << "No, the key " << qt << "IP" << qt <<
      " must be in upper case to work here!\n";
  } else {
    std::cout << "You didn't ask for " << qt << "IP" << " this time.\n";
  }
  std::cout << "\n";

  if (strstr(qus,"name") != NULL) {
    std::cout << "My name is Robert Elton Maas.\n";
  } else {
    std::cout << "You didn't ask for " << qt << "name" << qt <<
      " this time.\n";
  }
}
** End of listing of h2.cc **

Here is the directory entry for that source file:
-rw-------  1 rem  user  1994 Jul 11  2005 h2.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  7310 Jul 11  2005 h2-c++.cgi
   ^ Note user execute permission needed for all CGI programs.
(because compiled-C++ is native machine code running directly on machine)