First year in College
program Hello(input, output)
begin
writeln('Hello World');
end.

Senior year in College
(defun hello
(print
(cons 'Hello (list 'World))))

New professional
#include <stdio.h>

void main(void)
{
 char *message[] = {"Hello ", "World"};
 int i;
 for(i = 0; i < 2; ++i)
 printf("%s", message[ i]);
 printf("\n");
}

Seasoned professional
#include <iostream.h>
#include <string.h>
class string
{
 private:
  int size;
  char *ptr;
 public:
  string() : size(0), ptr(new char('\0')) {}
  string(const string &s) : size(s.size)
  {
    ptr = new char[size + 1];
    strcpy(ptr, s.ptr);
  }
  ~string()
  {
    delete [] ptr;
  }
  friend ostream &operator <<(ostream &, const string &);
  string &operator=(const char *);
};

ostream &operator<<(ostream &stream, const string &s)
{
  return(stream << s.ptr);
}
string &string::operator=(const char *chrs)
{
  if (this != &chrs)
  {
    delete [] ptr;
    size = strlen(chrs);
    ptr = new char[size + 1];
    strcpy(ptr, chrs);
  }
  return(*this);
}
int main()
{
  string str;
  str = "Hello World";
  cout << str << endl;
  return(0);
}

System Administrator
#include <stdio.h>
#include <stdlib.h>
main()
{
 char *tmp;
 int i=0;
 /* on y va bourin */
 tmp=(char *)malloc(1024*sizeof(char));
 while (tmp[ i]="Hello Wolrd"[i++]);
 /* Ooopps y'a une infusion ! */
 i=(int)tmp[8 ];
 tmp[8 ]=tmp[9];
 tmp[9]=(char)i;
 printf("%s\n",tmp);
}

Apprentice Hacker
#!/usr/local/bin/perl
$msg="Hello, world.\n";
if ($#ARGV >= 0) {
    while(defined($arg=shift(@ARGV))) {
        $outfilename = $arg;
        open(FILE, ">" . $outfilename) || die "Can't write $arg: $!\n";
        print (FILE $msg);
        close(FILE) || die "Can't close $arg: $!\n";
    }
} else {
    print ($msg);
}
1;

Experienced Hacker
#include <stdio.h>
#include <string.h>
#define S "Hello, World\n"
main(){exit(printf(S) == strlen(S) ? 0 : 1);}

Seasoned Hacker
% cc -o a.out ~/src/misc/hw/hw.c
% a.out
Hello, world.

Guru Hacker
% cat
Hello, world.

New Manager (do you remember?)
10 PRINT "HELLO WORLD"
20 END

Middle Manager
 mail -s "Hello, world." bob@b12
Bob, could you please write me a program that prints "Hello, world."?
I need it by tomorrow.
^D

Senior Manager
% zmail jim
I need a "Hello, world." program by this afternoon.

Chief Executive
% letter
letter: Command not found.
% mail
To: ^X ^F ^C
% help mail
help: Command not found.
% damn!
!: Event unrecognized
% logout
                                                                                                                                                                    channel9.msdn.com

microsoft man

#using <mscorlib.dll>

// Allow easy reference to the System namespace classes.
using namespace System;

// The global function, main, is the application's entry point.
void main() {
   // Write text to the console.
   Console::WriteLine(S"Hello World using Managed Extensions for C++!");
}  

                                                                                                                                                                   msdn.microsoft.com

 lol?

   το πιο ωραίο γαι μένα ειναι στον Seasoned professional .....