[Israel.pm] Evolution of Programmer - Not Perl-Only

Yossi.Itzkovich at ecitele.com Yossi.Itzkovich at ecitele.com
Sun Aug 29 23:45:22 PDT 2004





Hi,

I know it is not Perl-only, but it's a very good example of TIMTOWDI.

                          Evolution of 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(<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);
}
                             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 at 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





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