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

void main(void)

{

char *message[] = {"Hello ", "World"};

int i;

for(i = 0; i <>

printf("%s", message[i]);

printf("\n");

}

Seasoned professional

#include

#include <>

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 <<>

}

string &string::operator=(const char *chrs)

{

(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 <<>

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

#include

#include <>

#include

#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 <>

#include

#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

#include

#include <>

#include <>

#include

#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);

}

Believe me, all this gives the same output "Hello World"