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Hello World!

Das erste Programm der meisten Programmierer tut nichts weiter, als den Test "Hello World" auf dem Bildschirm darzustellen. Die Art und Weise, wie so etwas programmiert wird, zeigt von wem das Programm ist.

High School/Junior 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('')) {} 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("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++; return; } HRESULT __stdcall CHello::PrintSz(LPWSTR pwszString) { printf("%wsn", 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 "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 for 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] = ''; wcsT[0] = ''; if( argc > 1) { mbstowcs(wcsPath, argv[1], strlen(argv[1]) + 1); wcsupr(wcsPath); } else { fprintf(stderr, "Object path must be specifiedn"); 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 %wsn", wcsPath); printf("Text String %wsn", 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); } Sophisticated Programmer $ echo "Hello World"

looooooooooooooooooooooooooooooooool;-)

 
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