Hello World


Das Programm, das in jeder Programmiersprache zuerst geschrieben wird...

High School / Jr. High

  10 PRINT "HELLO WORLD"
  20 END

Erstes Jahr im College

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

Letztes Jahr im College

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

Frisch im Berufsleben

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

Berufserfahren

  #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);
  }

Sehr Berufserfahren

  [
    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);
  }

Hacker-Lehrling

  #!/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;

Erfahrener Hacker

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

Profi-Hacker

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

Hacker-Guru

  % cat
  Hello, world.
  ^D

Neuer Manager

  10 PRINT "HELLO WORLD"
  20 END

Normaler 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

Erfahrener Manager

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

Der Chef persönlich

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

 


QUELLE: HängeMathe der Uni Bonn, gesammelt von Roland Jesse (Otto v. Guericke Universitat Magdeburg, 1995)

 
 
Seitenanfang Zuletzt verändert: 24.11.2011