The Evolution of a Programmer

---

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();
      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 <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