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abstract class members c#

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Rasel Ahmed answered on September 29, 2020 Popularity 10/10 Helpfulness 2/10

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abstract class members c#

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/*
-Abstract modifier states that a class or a member misses implementation. We 
use abstract members when it doesn’t make sense to implement them in a base 
class. For xample, the concept of drawing a shape is too abstract. We don’t 
know how to draw a shape. This needs to be implemented in the derived classes.
-When a class member is declared as abstract, that class needs to be declared
as abstract as well. That means that class is not complete. 
-In derived classes, we need to override the abstract members in the base 
class.
-In a derived class, we need to override all abstract members of the base class, 
otherwise that derived class is going to be abstract too.
-Abstract classes cannot be instantiated
*/

public abstract class Shape
{ 
 // This method doesn’t have a body. 
 public abstract Draw();
}

public class Circle : Shape
{ 
 public override Draw()
 { 
 // Changed implementation
 }
}

Popularity 10/10 Helpfulness 2/10 Language csharp

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Tags: c#

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Contributed on Aug 28 2022

Rasel Ahmed

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what is abstract class in c#

Comments(1)

Abstract class: is a restricted class that cannot be used to create objects 
(to access it, it must be inherited from another class).

Popularity 10/10 Helpfulness 4/10 Language csharp

Source: Grepper

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Contributed on Sep 29 2020

Funny Flamingo

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C# abstract class

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An abstract class in an unfinished class 
whose purpose is to define some common definitions for its subclasses. 
It must be implemented in its subclasses.
Abstract class is created with the abstract keywords. 
We can create abstract methods and member fields.
Abstract classes cannot be instantiated and 
abstract methods cannot be implemented.

Popularity 10/10 Helpfulness 3/10 Language csharp

Source: zetcode.com

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Contributed on Nov 27 2022

PrashantUnity

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c# abstract class

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// Example of an abstract class in C#
public abstract class Animal
{
    public abstract void MakeSound();  // Abstract method
    
    public void Eat()
    {
        Console.WriteLine("Animal is eating."); 
    }
}

// Example of a derived class inheriting from the abstract class
public class Dog : Animal
{
    public override void MakeSound()
    {
        Console.WriteLine("Dog is barking."); 
    }
}

// Example usage of the abstract class and derived class
static void Main()
{
    Animal myDog = new Dog();
    myDog.MakeSound();  // Output: Dog is barking.
    myDog.Eat();  // Output: Animal is eating.
}

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Contributed on Sep 12 2023

YOU.com

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abstract method in c#

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abstract class Shape
{
    public abstract double GetArea();
}

class Triangle : Shape
{
    double baseLength;
    double height;
    
    public Triangle(double baseLength, double height)
    {
        this.baseLength = baseLength;
        this.height = height;
    }
    
    public override double GetArea()
    {
        return 0.5 * baseLength * height;
    }
}

class Rectangle : Shape
{
    double width;
    double height;
    
    public Rectangle(double width, double height)
    {
        this.width = width;
        this.height = height;
    }
    
    public override double GetArea()
    {
        return width * height;
    }
}

class Program
{
    static void Main(string[] args)
    {
        Shape triangle = new Triangle(4, 5);
        Shape rectangle = new Rectangle(3, 6);
        
        Console.WriteLine("Triangle area: " + triangle.GetArea());
        Console.WriteLine("Rectangle area: " + rectangle.GetArea());
    }
}

Popularity 9/10 Helpfulness 3/10 Language csharp

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Contributed on Sep 11 2023

YOU.com

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abstract class members c#

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