Hello World ...
Diese Sache kennt ja wohl jeder. Also Aufgabe ist es, ein Programm zu schreiben,
das "Hello World" auf dem Bildschirm ausgibt.
Und hier ein paar Lösungen:
Der Schüler schreibt:
10 PRINT "HELLO WORLD"
20 END
Der Student im ersten Jahr schreibt:
program Hello(input, output)
begin
writeln('Hello World')
end.
Der Student höheren Semesters schreibt:
(defun hello
(print
(cons 'Hello (list 'World))))
Der junge Informatiker schreibt:
#include
void main(void)
{
char *message[] = {"Hello ", "World"};
int i;
for(i = 0; i < 2; ++i)
printf("%s", message[i]);
printf("\n");
}
Der erfahrene Informatiker schreibt:
#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 << 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);
}
Der Programmier-Guru schreibt:
[
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("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 "thlo.h"
#include "pshlo.h"
#include "shlo.hxx"
#include "mycls.hxx"
int CHello::cObjRef = 0;
CHello::CHello(IUnknown *pUnk) : CHelloBase(pUnk)
{
cObjRef++;
}
HRESULT __stdcall CHello::PrintSz(LPWSTR pwszString)
{
printf("%ws\n", pwszString);
return ResultFromScode(S_OK);
}
CHello::~CHello()
{
// when the object count goes to zero, stop the server
cObjRef--;
if (cObjRef == 0)
PulseEvent(hEvent);
}
#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 "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\n", hRslt);
// Tell OLE we are going away.
CoUninitialize();
}
return 0;
}
Der auszubildende Hacker schreibt:
#!/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;
Der erfahrene Hacker schreibt:
#include
#define S "Hello, World\n"
main(){exit(printf(S) == strlen(S) ? 0 : 1);}
Der gereifte Hacker schreibt:
% cc -o a.out ~/src/misc/hw/hw.c
% a.out
Der Guru-Hacker schreibt:
% cat
Hello, world.
^^D
Der junge Manager schreibt:
10 PRINT "HELLO WORLD"
20 END
Der erfahrene Manager schreibt:
mail -s "Hello, world." bob@b12
Bob, could you please write me a program that prints "Hello, world."?
I need it by tomorrow.
^^D
Der Chef-Manager schreibt:
% zmail jim
I need a "Hello, world." program by this afternoon.
Der Geschäftsführer schreibt:
% letter
letter: Command not found.
% mail
To: ^^X ^^F ^^C
% help mail
help: Command not found.
% damn!
!: Event unrecognized
% logout
begin: vcard
fn: Tim Preston
n: Preston;Tim
org: MDIS
adr;dom: ;;Boundary Way;Hemel Hempstead;Herts;HP2 7HU;
email;internet: tpreston@u...
title: Principal Consultant
tel;work: +44 1442 272084
tel;fax: +44 1442 272777
x-mozilla-cpt: ;0
x-mozilla-html: FALSE
version: 2.1
end: vcard