0
I have to assume the question is for C#, not C, because C does not provide abstract class concept.
public abstract class A1 { public virtual void SayHi() { Console.WriteLine("Hello World"); }
public abstract void DoSomething();
}
The above abstract class A1 contains 1 virtual method and 1 abstract method. [Note that because of the abstract keyword for Dosomething(), A1 must be declared as abstract. An abstract class DOES NOT have to have any abstract methods!!)
The virtual function SayHi() provides a implementation, while the abstract function provides nothing but only the method signature( the name of the method, the return type, and method parameters and their data types). The derived class of A1 has the option to override SayHi() and must implement (or defer to subclasses of this derived class) the method DoSomething()
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
What is member fusion in c plus plus?
If you are asking about member functions. When we declare a function inside a class then that function becomes member function of that class and this function can access the whole class
What is self referential function in c plus plus?
A self-referential function in C++, or in any other supporting language, is a recursive function.
What is the implicit name of the parameter that gets passed into the set method of class in c?
Every non-static member function has a hidden pointer parameter named this which refers to the instance of the class the function was invoked against. For a given class, C, the type of the hidden this pointer is const C* but if the function is declared const, the pointer is const C* const. When referring to any class member, m, from within any non-static member function, this->m is implied.
What is the use of private constructor in c plus plus?
Private construction prevents objects from the class from being instantiated other than via a static member function of the class, a friend function or a friend class.
Why can't the accessor member function change any of the values in a class in C plus plus?
Nothing stops a member function from changing any of the values in a class. By convention, an accessor function is used to give read only access to class data, but that does not mean that it is prohibited from doing so. It is a member function, after all, and it has all the rights of any member function of the class.
What is member fusion in c plus plus?
If you are asking about member functions. When we declare a function inside a class then that function becomes member function of that class and this function can access the whole class
What is the unit of programming in c plus plus A. Function B. class C. object D. Attribute?
B. Class.
What is abrstac class and virctulfunction in c sharp?
abstract class is a class label with abstract. It is just like a common class, with the following characterics: 1. Abstract class cannot be instantiate with an instance. 2. Abstract class may have abstract methods, while the normal class cannot have abstract methods. a virtual function in C# is a way to provide a default implementation for the class hierarchy. Both abstract class and common class (not sealed) can have virtual methods/ functions. Note that an abstract method (of an abstract class) is defining the intent, no codes (no default behavior), the implementation are left for the derived classes to do so. The virtual function if defined in an abstract class must define the implementation, the minimum is to do nothing: public abstract class Vehicle { public abstract int GetNumberOfTires(); public virtual void Move() { // default is doing nothing} } public class Car : Vehicle { public override int GetNumberOfTires() { return 4; } public override void Move() { throws new OutOfFuelExpection(); } }
What is self referential function in c plus plus?
A self-referential function in C++, or in any other supporting language, is a recursive function.
What is the implicit name of the parameter that gets passed into the set method of class in c?
Every non-static member function has a hidden pointer parameter named this which refers to the instance of the class the function was invoked against. For a given class, C, the type of the hidden this pointer is const C* but if the function is declared const, the pointer is const C* const. When referring to any class member, m, from within any non-static member function, this->m is implied.
What is conustrutor?
A constructor is a function in C which has the same name of the class. The constructor can be used to initialize some function.
Difference between member function and friend function?
1. Function - is normally refered to a C-style function which has a global level scope. As long as its declaration is visible in a file where it is being used, and the definition is available somewhere in the application, the linker will find the definition and link to it. It can be used anywhere in the application. 2. Member function - is normally referred to a C++Style method declared/defined inside of a C++ class. The scope for such member functions is the class. They are not accessible outside the class and are only accessible thru an object/instance of such a class. There are, of course, exceptions to this, such as static and friends.
Explain the different access storage specifiers available in c?
The storage class specifiers in C and C++ are:autoexternmutableregisterstatictypedefA storage class specifier is used to refine the declaration of a variable, a function, and parameters
What is the use of private constructor in c plus plus?
Private construction prevents objects from the class from being instantiated other than via a static member function of the class, a friend function or a friend class.
What is the difference between a function and class in C?
A function is a set of instructions, whereas a class is a set of related data and its related functions.e-g an 'Add' function will have statements related to addition of two numbers. And a 'Calculator' class will have functions like Add, Subtract etc..
Why can't the accessor member function change any of the values in a class in C plus plus?
Nothing stops a member function from changing any of the values in a class. By convention, an accessor function is used to give read only access to class data, but that does not mean that it is prohibited from doing so. It is a member function, after all, and it has all the rights of any member function of the class.
What is meant by extension?
extensible means to enhance the program with new capabilities. In c++, extensibility can be achieved by using virtual function. now first we discuss what is virtual function in c++. " C++ virtual function is a member function of a class, whose functionality can be over-ridden in its derived classes. The whole function body can be replaced with a new set of implementation in the derived class." Through this u can be able to promote extensibility in your program by using Virtual function. Very simple concept.
