The Write() function can be used to write data to file. It can be any array, a structure or a class.
we need to pass two arguments to the Write(). First one is the Initial byte address of the object that is being written and the second one is represents the total number of bytes that is being written.
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If an array of objects is created, then read() function can work with
The Read() function can be used to read data from file. The Read() returns null if there is no data to read.
we need to pass two arguments to the Read(). First one is the Initial byte address of the data stored in the file and the second one is represents the total number of bytes that is being read.
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The keyword virtual indicates that
Aa derived class has public access to a base class
Bmore than one base class exists
Ca base class should be used only once in inheritance
Da derived class should have more than one base class constructed.
Virtual keyword, when assigned to base class while deriving a new class helps to prevent having multiple instances of the base class. so that there will be no ambiguity.
Lets say class b and class c are derived classes of class a and class a has a member function void foo(). Now, if we derive class d from both class b and class c, then the statement d.foo() creates ambiguity between the versions of class b and class c. To avoid this behavior, we must use Virtual keyword before the base class ('a') while deriving the classes b and c.
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Static class member's definitions and intializations occurs
Static class member functions are independent of how many objects are created for that class. There will be only one copy the static member function will be existed for all instances of the class. We don't have to instantiate a class to access static functions of that class. we use scope resolution operator '::' to access static member functions.
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Which of the following can be thrown in a C++ program?
There are 3 access specifiers in c++. Public, Private and Protected.
Public members are accessible outside the class through an object of the class.
Protected members are also accessible outside the class but only from the class which derived it.All public members of a base class becomes protected members of the derived class.
Private members can not be accessed from outside the class.
In Private inheritance, all public and protected members of base class becomes private to the derived class and can be accessible.
To expose a data member to the program, the data member must be declared in the public section of the class.
The best written class may have all member variables declared as private and only some of the member functions should be exposed to public. And the member functions in turn can modify the private member variables of the class. So that we will avoid the risk of updating object's behavior by updating member variables by outside member functions.
There are 3 access specifiers in c++. Public, Private and Protected.
Public members are accessible outside the class through an object of the class.
Protected members are also accessible outside the class but only from the class which derived it.All public members of a base class becomes protected members of the derived class.
Private members can not be accessed from outside the class.
In Private inheritance, all public and protected members of base class becomes private to the derived class and can be accessible.
To hide a data member from the program, you must declare the data member in the Private section of the class.
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