Evoluzione di un Programmatore

Liceo

10 PRINT "HELLO WORLD"
20 END

Primo anno di università

program Hello(input, output)
begin
writeln('Hello World')
end.

Ultimi anni dell'università

(defun hello
   (print
      (cons 'Hello (list 'World))))

Neolaureato

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

Professionista affermato

#include <iostream.h>
#include <string.h>
class string {
  private:
  int size;
  cjar *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);
}

Capo programmatore

[
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();
      importheader();
      importheader();
      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
  #include
  #include
  #include
  #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
  #include
  #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
  #include
  #include
  #include
  #include
  #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);
  }


Hacker apprendista

#!/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;

Hacker esperto

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

Hacker affermato

% cc -o a.out ~/src/misc/hw/hw.c
% a.out

Guru Hacker

% cat
Hello, world.
^D

Neodirigente

10 PRINT "HELLO WORLD"
20 END

Dirigente di mezzo

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

Dirigente di alto livello

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

Amministratore delegato

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