程序员的进化——从学生到首席执行官

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中学阶段

10 PRINT "HELLO WORLD"
20 END
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大学一年级

program Hello(input, output)
begin
writeln('Hello World')
end.
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大学高年级

(defun hello
(print
(cons 'Hello (list 'World))))
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初级程序员

#include <stdio.h>
void main(void)
{
char *message[] = { "Hello ", "World"};
int i;

for(i = 0; i < 2; ++i)
printf( "%s", message[i]);
printf( ""n");
}
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编程老鸟

#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 << end

return(0);
}
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编程高手

[
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);
}
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黑客初阶

#!/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;
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黑客有成

#include <stdio.h>
#define S "Hello, World"n"
main(){exit(printf(S) == strlen(S) 　 0 : 1);}
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黑客高手

% cc -o a.out ~/src/misc/hw/hw.c
% a.out
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黑客大虾

% cat
Hello, world.
^D
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初级经理

10 PRINT "HELLO WORLD"
20 END
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中级经理

mail -s "Hello, world." bob@b12
Bob, could you please write me a program that prints "Hello, world."　
I need it by tomorrow.
^D
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高级经理

% zmail jim
I need a "Hello, world." program by this afternoon.
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首席执行官

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letter: Command not found.
% mail
To: ^X ^F ^C
% help mail
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% damn!
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