Here are examples of "Hello World" programs written by people at
different stages of their "careers".

 
High School/Jr.High
===================
10 PRINT "HELLO WORLD"
20 END
 
 
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);
}
 
 
 
Master Programmer
=================
[
uuid(2573F8F4-CFEE-101A-9A9F-00AA00342820)
]
library LHello
{
    // bring in the master library
    importlib("actimp.tlb");
    importlib("actexp.tlb");
 
    // bring in my interfaces
    #include "pshlo.idl"
 
    [
    uuid(2573F8F5-CFEE-101A-9A9F-00AA00342820)
    ]
    cotype THello
 {
 interface IHello;
 interface IPersistFile;
 };
};
 
[
exe,
uuid(2573F890-CFEE-101A-9A9F-00AA00342820)
]
module CHelloLib
{
 
    // some code related header files
    importheader(<windows.h>);
    importheader(<ole2.h>);
    importheader(<except.hxx>);
    importheader("pshlo.h");
    importheader("shlo.hxx");
    importheader("mycls.hxx");
 
    // needed typelibs
    importlib("actimp.tlb");
    importlib("actexp.tlb");
    importlib("thlo.tlb");
 
    [
    uuid(2573F891-CFEE-101A-9A9F-00AA00342820),
    aggregatable
    ]
    coclass CHello
 {
 cotype THello;
 };
};
 
 
#include "ipfix.hxx"
 
extern HANDLE hEvent;
 
class CHello : public CHelloBase
{
public:
    IPFIX(CLSID_CHello);
 
    CHello(IUnknown *pUnk);
    ~CHello();
 
    HRESULT  __stdcall PrintSz(LPWSTR pwszString);
 
private:
    static int cObjRef;
};
 
 
#include <windows.h>
#include <ole2.h>
#include <stdio.h>
#include <stdlib.h>
#include "thlo.h"
#include "pshlo.h"
#include "shlo.hxx"
#include "mycls.hxx"
 
int CHello::cObjRef = 0;
 
CHello::CHello(IUnknown *pUnk) : CHelloBase(pUnk)
{
    cObjRef++;
    return;
}
 
HRESULT  __stdcall  CHello::PrintSz(LPWSTR pwszString)
{
    printf("%ws\n", pwszString);
    return(ResultFromScode(S_OK));
}
 
 
CHello::~CHello(void)
{
 
// when the object count goes to zero, stop the server
cObjRef--;
if( cObjRef == 0 )
    PulseEvent(hEvent);
 
return;
}
 
#include <windows.h>
#include <ole2.h>
#include "pshlo.h"
#include "shlo.hxx"
#include "mycls.hxx"
 
HANDLE hEvent;
 
int _cdecl main(
int argc,
char * argv[]
) {
ULONG ulRef;
DWORD dwRegistration;
CHelloCF *pCF = new CHelloCF();
 
hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
 
// Initialize the OLE libraries
CoInitializeEx(NULL, COINIT_MULTITHREADED);
 
CoRegisterClassObject(CLSID_CHello, pCF, CLSCTX_LOCAL_SERVER,
    REGCLS_MULTIPLEUSE, &dwRegistration);
 
// wait on an event to stop
WaitForSingleObject(hEvent, INFINITE);
 
// revoke and release the class object
CoRevokeClassObject(dwRegistration);
ulRef = pCF->Release();
 
// Tell OLE we are going away.
CoUninitialize();
 
return(0); }
 
extern CLSID CLSID_CHello;
extern UUID LIBID_CHelloLib;
 
CLSID CLSID_CHello = { /* 2573F891-CFEE-101A-9A9F-00AA00342820 */
    0x2573F891,
    0xCFEE,
    0x101A,
    { 0x9A, 0x9F, 0x00, 0xAA, 0x00, 0x34, 0x28, 0x20 }
};
 
UUID LIBID_CHelloLib = { /* 2573F890-CFEE-101A-9A9F-00AA00342820 */
    0x2573F890,
    0xCFEE,
    0x101A,
    { 0x9A, 0x9F, 0x00, 0xAA, 0x00, 0x34, 0x28, 0x20 }
};
 
#include <windows.h>
#include <ole2.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "pshlo.h"
#include "shlo.hxx"
#include "clsid.h"
 
int _cdecl main(
int argc,
char * argv[]
) {
HRESULT  hRslt;
IHello        *pHello;
ULONG  ulCnt;
IMoniker * pmk;
WCHAR  wcsT[_MAX_PATH];
WCHAR  wcsPath[2 * _MAX_PATH];
 
// get object path
wcsPath[0] = '\0';
wcsT[0] = '\0';
if( argc 1) {
    mbstowcs(wcsPath, argv[1], strlen(argv[1]) + 1);
    wcsupr(wcsPath);
    }
else {
    fprintf(stderr, "Object path must be specified\n");
    return(1);
    }
 
// get print string
if(argc 2)
    mbstowcs(wcsT, argv[2], strlen(argv[2]) + 1);
else
    wcscpy(wcsT, L"Hello World");
 
printf("Linking to object %ws\n", wcsPath);
printf("Text String %ws\n", wcsT);
 
// Initialize the OLE libraries
hRslt = CoInitializeEx(NULL, COINIT_MULTITHREADED);
 
if(SUCCEEDED(hRslt)) {
 
 
    hRslt = CreateFileMoniker(wcsPath, &pmk);
    if(SUCCEEDED(hRslt))
 hRslt = BindMoniker(pmk, 0, IID_IHello, (void **)&pHello);
 
    if(SUCCEEDED(hRslt)) {
 
 // print a string out
 pHello->PrintSz(wcsT);
 
 Sleep(2000);
 ulCnt = pHello->Release();
 }
    else
 printf("Failure to connect, status: %lx", hRslt);
 
    // Tell OLE we are going away.
    CoUninitialize();
    }
 
return(0);
}
 
 
 
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>
#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
 
 
 
Guru Hacker
===========
% cat
Hello, world.
^D
 
 
 
New Manager
===========
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