高中时期

  10 PRINT "HELLO WORLD"
  20 END

大学新生

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


高年级大学生

#include 
 
int main(void)
{
   printf("Hello, world!\\n");
   return 0;
}

职业新手

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

职业老手

  #include 
  #include 
 using namespace std;

  class string
  {
  private:
    int size;
    char *ptr;
 
  string() : size(0), ptr(new char[1]) { ptr[0] = 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);
  }

大师级

  [
  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 ", 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); }

黑客学徒

  #!/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;

有经验的黑客

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

老练的黑客

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

超级黑客

  % echo "Hello, world."

一线经理

  10 PRINT "HELLO WORLD"
  20 END

中层经理

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

高级经理

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

首席执行官

  % letter
  letter: Command not found.
  % mail
  To: ^X ^F ^C
  % help mail
  help: Command not found.
  % damn!
  !: Event unrecognized
  % logout

来源：未知

关于更多的“hello world”请参看：《Hello World 集中营》