Skip to main content

When do we use virtual function? Differentiate early and late binding.

Virtual functions are used in object-oriented programming to achieve polymorphism. In particular, virtual functions are used in the following scenarios:
  1. When a base class pointer points to an object of the derived class, and we want to call a member function of the derived class through the base class pointer. This is known as runtime polymorphism, and it requires the use of virtual functions.
  2. When a base class has one or more functions that are intended to be overridden by derived classes. In this case, the base class should declare these functions as virtual, so that the derived classes can override them as needed.
In general, virtual functions are used to provide a way for derived classes to customize the behavior of a base class, while still remaining a common interface with other classes in the inheritance hierarchy. This makes it easier to write code that can work with object of different derived classes, without having to know the details of each class's implementation.

Early binding and late binding are two concepts related to polymorphism in object-oriented programming languages like C++ and Java. Here are the difference between the two:

Early Binding:

  1. Also known as static binding, compile-time binding, or overloading resolution at compile time.
  2. The binding of a function call to a function implementation happens at compile time, based on the static type of the object or pointer.
  3. It is efficient because the binding is resolved at compile time, which saves time during runtime.
  4. It is used when the type of object or pointer is known at compile time.
Late Binding:
  1. Also known as dynamic binding, runtime binding or overriding resolution at runtime.
  2. The binding of a function call to a function implementation happens at runtime, based on the actual type of the object or pointer.
  3. It is less efficient because the binding is resolved at runtime, which takes more time during execution.
  4. It is used when the type of object or pointer is not known until runtime

Labels:

Comments

Post a Comment

If you have any doubts, please let me know

Popular posts from this blog

Write a program using the algorithm count() to count how many elements in a container have a specified value.

 Here's an example program using the count() algorithm to count the number of occurrences of a specific value in a vector container: #include <iostream> #include <vector> #include <algorithm> using namespace std; int main() {     vector<int> numbers = { 2, 5, 3, 7, 8, 5, 1, 5, 4 };          // count the number of occurrences of the value 5 in the vector     int count = count(numbers.begin(), numbers.end(), 5);          cout << "The number of occurrences of 5 in the vector is: " << count << endl;          return 0; } Output: The number of occurrences of 5 in the vector is: 3 Explanation: The program starts by creating a vector named numbers that contains several integer values. The count() algorithm is used to count the number of occurrences of the value 5 in the numbers vector. The function takes three arguments: the beginning and end iterators of...
Post a Comment
Read more

Define polymorphism. Differentiate between overloading and overriding method with example.

 Polymorphism is a concept in object-oriented programming that allows objects of different classes to be treated as if they were objects of the same class. It allows a single method or operation to have different meanings or behaviors based on the context in which it is used. In Java, there are two types of polymorphism: Compile-time Polymorphism: This is achieved through method overloading, where two or more methods in a class have the same name but different parameters. Runtime Polymorphism: This is achieved through method overriding, where a subclass provides its own implementation of a method that is already defined in its parent class. Here is an example of method overloading: class MyClass {    public int sum(int a, int b) {       return a + b;    }    public double sum(double a, double b) {       return a + b;    } } public class Main {    public static void main(String[] args) {     ...
Post a Comment
Read more

write a program in C++ to overload '-' operator to find difference of two complex object.

write a program to overload '-' operator to find difference of two complex object /* program in C++ to overload '-' operator to find difference of two complex object */ #include<iostream> using namespace std; class Complex{     public:     float a, b;     complex(): a(0), b(0) {}     complex(float x, float y): a(x), b(y){}     void display(){          cout<<this->a<<"+"<<this->b<<"i"<<endl;     }     friend Complex operator-(const Complex&, const Complex&); }; complex operator-(const Complex& com, const Complex& comp){     float x= com.a - comp.a;     foat y= com.b - comp.b;     return Complex(x,y); } int main(){     Complex a(1,7), b(6,9);     cout<<"A = ";a.display();      cout<<"B = ";b.display();      cout<<"A - B = ";(a-b).display(); ...
Post a Comment
Read more