Scrivere un semplice programma che stampa la classca scritta
ciao mondo non è poi così banale, e molte possono essere le strade
da seguire, a seconda delle propre attitudini e conoscenze..
=================== 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 < 2; ++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 <<
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(); 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
CoInitiali, 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); }
================= 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 #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
===================== AXE System
programmer =====================
LL0: .seg
"data" .seg
"text" .proc 04 .global _main
_main: !#PROLOGUE# 0 sethi
%hi(LF26),%g1 add
%g1,%lo(LF26),%g1
save
%sp,%g1,%sp !#PROLOGUE# 1 .seg
"data1" L30: .ascii
"Hello, World\012\0" .seg
"text" .seg
"data1" L32: .ascii
"Hello, World\012\0" .seg
"text" set
L32,%o0 call
_strlen,1 nop mov
%o0,%i5 set
L30,%o0 call
_printf,1 nop cmp
%o0,%i5 bne
L2000000 nop mov
0,%o0 b
L2000001
nop
L2000000: mov
0x1,%o0 L2000001: call
_exit,1 nop
LE26: ret restore
LF26 = -96 LP26 = 96 LST26 = 96 LT26 = 96 .seg
"data"
0000000 0103 0107 0000 0060 0000 0020 0000 0000
0000020 0000 0030 0000 0000 0000 0054 0000 0000
0000040 033f ffff 8200 63a0 9de3 8001 1100 0000
0000060 9012 2000 4000 0000 0100 0000 ba10 0008
0000100 1100 0000 9012 2000 4000 0000 0100 00 ba10 0008
0000100 1100 0000 9012 2000 4000 0000 0100 0000
0000120 80a2 001d 1280 0005 0100 0000 9010 2000
0000140 1080 0003 0100 0000 9010 2001 4000 0000
0000160 0100 0000 81c7 e008 81e8 0000 0000 0000
0000200 4865 6c6c 6f2c 2057 6f72 6c64 0a00 4865
0000220 6c6c 6f2c 2057 6f72 6c64 0a00 0000 0000
0000240 0000 000c 0000 0608 0000 006e 0000 0010
0000260 0000 060b 0000 006e 0000 0014 0000 0286
0000300 ffff ffec 0000 0020 0000 0608 0000 0060
0000320 0000 0024 0000 060b 0000 0060 0000 0028
0000340 0000 0186 ffff ffd8 0000 004c 0000 0386
0000360 ffff ffb4 0000 0004 0500 0000 0000 0000
0000400 0000 000a 0100 0000 0000 0000 0000 0012
0000420 0100 0000 0000 0000 0000 001a 0100 0000
0000440 0000 0000 0000 0020 5f6d 6169 6e00 5f70
0000460 7269 6e74 6600 5f73 7472 6c65 6e00 5f65
0000500 7869 7400 0000504
% axe_generate -f system.uhdl
Application 'Exchange' generated 2324042350000000 source code lines
No Errors detected.
Hardware retrieval...done OK Certification
Test...done OK Packing..............done OK Delivery.............done OK
Application 'Exchange' delivered to customer
23456000 bytes/sec. End processing, 2345
seconds.
=========================== Ultra
high level programmer ===========================
system.uhdl :
SYSTEM CREATE ScreenWin
SIZE 20000000/Unit=One DESTINATION Order.dest[One] OUTPUT CHARACTER['Hello world']
END
END
=========== 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 all
I need a "Hello, world." program by this afternoon.
=============== Chief Executive
===============
% message message:
Command not found % pm
pm: Command not found % letter
letter: Command not found.
% mail To: ^X ^F ^C
> help mail help: Command not found.
>what
what: Command not found
>need help need:
Command not found > damn!
!: Event unrecognized >exit
exit: Unknown >quit
% % logout
Bipppp ! Mrs Thomsson ? Please page Tommy for me. NOW
!
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