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程序员的进化——从学生到首席执行官

2008-07-31 09:44 316 查看
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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[i]);

            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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黑客大虾

          % 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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