Progression of the Languages
We should not forget that the
quality and properties of the code
is not only due to the language used
but also due to who is developing
the code.
A compilation of "Hello
World" programs designed by various
categories of
"developers" follows.
--------------------------------------
Jr.High/High School
===================
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@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
From the PIT's Mailing List