Every programming language tutorials starts with the classic Hello World example.

A “hello world” program is a computer program that prints out “Hello, World!” on a display device. It is used in many introductory tutorials for teaching a programming language. Such a program is typically one of the simplest programs possible in a computer language.

Bruno Silva found a site which collects these examples for every language, The Hello Word Collection.

This collection includes 349 Hello World programs in many more-or-less well known programming languages, plus 58 human languages. The list was compiled by Wolfram Rösler with help from many people around the world. It was started on 3-Oct-1994, put on the Internet on 30-Dec-1999, exceeded 200 entries on 14-Jul-2005, and 300 on 6-Dec-2006. It is now probably the biggest collection of Hello World programs on the Internet, and the only one collecting human languages as well.

You can notice that some span just 1 line of code, others too many, like this one:

C++-Epoc

// Hello World in C++, Epoc style (for Symbian OS)

#include <eikapp.h>
#include <eikdoc.h>
#include <eikappui.h>

class CHelloWorldAppUi;
class CEikApplication;
class CHelloWorldAppView;

class CHelloWorldApplication : public CEikApplication
    {
        public:
            TUid AppDllUid() const;
        protected:
            CApaDocument* CreateDocumentL();
    };

class CHelloWorldDocument : public CEikDocument
    {
        public:
            static CHelloWorldDocument* NewL(CEikApplication& aApp);
            static CHelloWorldDocument* NewLC(CEikApplication& aApp);
            ~CHelloWorldDocument(){};
        public:
            CEikAppUi* CreateAppUiL();
        private:
            void ConstructL() {};
            CHelloWorldDocument(CEikApplication& aApp){};
    };

class CHelloWorldAppUi : public CEikAppUi
    {
        public:
                void ConstructL();
                CHelloWorldAppUi(){};
                ~CHelloWorldAppUi(){};
    };

static const TUid KUidHelloWorldApp = {0x10005B91};

GLDEF_C TInt E32Dll(TDllReason )
    {
    return KErrNone;
    }

EXPORT_C CApaApplication* NewApplication()
    {
    return (new CHelloWorldApplication);
    }

CApaDocument* CHelloWorldApplication::CreateDocumentL()
    {
    CApaDocument* document = CHelloWorldDocument::NewL(*this);
    return document;
    }

TUid CHelloWorldApplication::AppDllUid() const
    {
    return KUidHelloWorldApp;
    }

CHelloWorldDocument* CHelloWorldDocument::NewL(CEikApplication& aApp)
    {
    CHelloWorldDocument* self = NewLC(aApp);
    CleanupStack::Pop(self);
    return self;
    }

CHelloWorldDocument* CHelloWorldDocument::NewLC(CEikApplication& aApp)
    {
    CHelloWorldDocument* self = new (ELeave) CHelloWorldDocument(aApp);
    CleanupStack::PushL(self);
    self->ConstructL();
    return self;
    }

CEikAppUi* CHelloWorldDocument::CreateAppUiL()
    {
    CEikAppUi* appUi = new (ELeave) CHelloWorldAppUi;
    return appUi;
    }

void CHelloWorldAppUi::ConstructL()
    {
    BaseConstructL();

    _LIT(message,"Hello!");
    CAknInformationNote* informationNote = new (ELeave) CAknInformationNote;
    informationNote->ExecuteLD(message);

}

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