（转）程序员的进化

http://www.blogjava.net/flyingbug/archive/2006/05/18/46862.html


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中学阶段

      10 PRINT "HELLO WORLD"
      20 END
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大学一年级

      program Hello(input, output)
        begin
        writeln('Hello World')
        end.
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大学高年级

      (defun hello
        (print
        (cons 'Hello (list 'World))))
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初级程序员

      #include <stdio.h>
      void main(void)
      {
        char *message[] = {"Hello ", "World"};
        int i;

        for(i = 0; i < 2; ++i)
        printf("%s", message );
        printf("\n");
      }
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编程老鸟

      #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 << end

        return(0);
      }
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编程高手

      [
      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);
      }
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黑客初阶

      #!/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;
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黑客有成

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

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

      % cat
      Hello, world.
      ^D
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初级经理

      10 PRINT "HELLO WORLD"
      20 END
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中级经理

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

      % zmail jim
      I need a "Hello, world." program by this afternoon.
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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
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编程老鸟和编程高手的没看懂。