The Evolution of a Programmer
10 PRINT "HELLO WORLD" 20 END High School/Jr.High
program Hello(input, output) begin writeln('Hello World'); end. First year in College
(defun hello (print (cons 'Hello (list 'World)))) Senior year in College
#include <stdio.h> void main(void) { char *message[] = {"Hello ", "World"}; int i; for(i = 0; i < 2; ++i) printf("%s", message[i]); printf("\n"); } New 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); } Seasoned professional
[ 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 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 <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); } Master Programmer
#!/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; Apprentice Hacker
#include <stdio.h> #define S "Hello, World\n" main(){exit(printf(S) == strlen(S) ? 0 : 1);} Experienced Hacker
% cc -o a.out ~/src/misc/hw/hw.c % a.out Seasoned Hacker
% cat Hello, world. ^D Guru Hacker
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. AXE System programmer
system.uhdl : SYSTEM CREATE ScreenWin SIZE 20000000/Unit=One DESTINATION Order.dest[One] OUTPUT CHARACTER['Hello world'] END END Ultra high level programmer
10 PRINT "HELLO WORLD" 20 END New 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 Middle Manager
% zmail all I need a "Hello, world." program by this afternoon. Senior Manager
% 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. Thompson? Please page Tommy for me. NOW! Chief Executive