Here are examples of "Hello World" programs written by people at different stages of their "careers".
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
(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 << end1;return(0);
}
Master Programmer
[
uuid(2573F8F4-CFEE-101A-9A9F-OOAA00342820)
]
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-OOAA00342820)
]
cotype THello
{
interface IHello;
interface IPersistFile;
};
};[
exe,
uuid(2573F890-CFEE-101A-9A9F-OOAA00342820)
]
module CHelloLib
{// some code relatedheader 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-OOAA00342820),
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-OOAA00342820
0x2573F891,
0xCFEE,
0x10lA,
{ 0x9A, 0x9F, 0x00, 0xAA, 0x00, 0x34, 0x28, 0x20 }
};UUID LIBID_CHelloLib = { /* 2573F890-CFEE-101A-9A9F-OOAA00342820 */
0x2573F890,
0xCFEE,
0x10lA,
{ 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
n(
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(stder, "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.
Senior Manager
% zmail jim
I need a "Hello, world." program by this afternoon.
Chief Executive
% letter
letter: Command not found.
To: ^X ^F ^C
% help mail
help: Command not found.
% damn!
: Event unrecognized
% logout