#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <string>
using namespace std;

main(int argc, char **argv)
{
  char *s;
  string str;
  const char *str_tmp;
  int i;

  if (argc != 2) {
    cerr << "usage: stringhelp word\n";
    exit(1);
  }

  s = argv[1];
  str = argv[1];

  str[0] = 'J';

  cout << "After changing str[0] to J: argv[1] = " << argv[1] << 
         ", str = " << str << " and s = " << s << endl;

  s[0] = 'P';
  cout << "After changing s[0] to P:   argv[1] = " << argv[1] << 
         ", str = " << str << " and s = " << s << endl;

  cout << endl;
  cout << "Memory pointers:\n\n";

  printf("%15s: 0x%lx\n", "argv[1]", argv[1]);
  printf("%15s: 0x%lx\n", "s", s);
  printf("%15s: 0x%lx\n", "str.c_str()", str.c_str());

}