Calling Member Functions within Main C

Question

include  lt iostream gt   using namespace std   class MyClass   public         void printInformation        void MyClass  printInformation          return     int main          MyClass  printInformation         fgetc  stdin        return 0       How would I call the printInformation function within main  The error tells me that I need to use a class object to do so

User · Answer

declare it  static  like this   static void MyClass  printInformation     return

User · Answer

On an informal note  you can also call non-static member functions on temporaries   MyClass   printInformation       on another informal note  the end of the lifetime of the temporary variable  variable is important  because you can also call non-const member functions  comes at the end of the full expression

User · Answer

You need to create an object since printInformation   is non-static  Try   int main      MyClass o  o printInformation     fgetc  stdin    return 0

User · Answer

Declare an instance of MyClass  and then call the member function on that instance   MyClass m   m printInformation

User · Answer

you have to create a instance of the class for calling the method

User · Answer

If you want to make your code work as above  the function printInformation   needs to be declared and implemented as a static function   If  on the other hand  it is supposed to print information about a specific object  you need to create the object first

User · Answer

From your question it is unclear if you want to be able use the class without an identity or if calling the method requires you to create an instance of the class  This depends on whether you want the printInformation member to write some general information or more specific about the object identity   Case 1  You want to use the class without creating an instance  The members of that class should be static  using this keyword you tell the compiler that you want to be able to call the method without having to create a new instance of the class    class MyClass   public      static void printInformation         Case 2  You want the class to have an instance  you first need to create an object so that the class has an identity  once that is done you can use the object his methods   Myclass m  m printInformation        Or  in the case that you want to use pointers  Myclass   m   new Myclass    m- gt printInformation      If you don t know when to use pointers  read Pukku s summary in this Stack Overflow question  Please note that in the current case you would not need a pointer   -

[c++] Calling Member Functions within Main C++

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