Question

write code to demonstrate the features of oop use C# programming.

Answer 1

OOPS Concepts

Class: A class is made up of three things :- Name, operations, attributes

Object: combination of variables, functions, and data that performs a set of related activities

Encapsulation: when a group of related methods, properties, and other members are treated as a single object.

Inheritance: the ability to receive (inherit) methods and properties from an existing class.

Polymorphism : when each class implements the same methods in varying ways, but you can still have several classes that can be utilized interchangeably.

Abstraction : process by which a developer/coder hides everything other than the relevant data about an object in order to simplify and increase efficiency.

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Code Snippet for Class

Class Example {

/* Fields,

Variables,

Properties

*/

}

---------------------------------------------------------------------------------------------------------------------------------------------------------------------

Code Snippet for Object

Class Example {
/* Fields,

Variables,

Properties

*/

}

/* Syntax to create object for Class Example */

Example exampleObject = new Example();

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Inheritance:- Inheritance allows the child class to reuse the property of the parent class. It increases code reusability.

Code Snippet for Inheritance

public class parentclass{

public parentclassmethod()
{
Console.WriteLine("Parent class method");
}
}

public class childclass : parentclass /* child class inherting parent class */

{

public childclassmethod
{

Console.WriteLine("Child class method");

}

}

Class Test
{

static void Main(string[] args)
{

childclass obj = new childclass(); /* creating child class object to call parent class method */
obj.parentclassmethod();
}

}

}

output

Parent class method

----------------------------------------------------------------------------------------------------------------

Polymorphism :- are of two types

1. Compile Time Polymorphism :- we will declare method with same name but with different parameter/signature

Code snippet

public class ParentClass
{
public void sum(int a, int b) {

Console.WriteLine(a+b);
}

public void sum(int a, int b, int c)
{
Console.WriteLine(a+b+c);
}
}

Class Test
{
static void Main(String[] args)
{

prentclass obj = new ParentClass();
obj.sum(10,20);
obj.sum(10,20,25);
Console.ReadLine();
}
}
}

Output

30
55

2. RunTime Polymorphism:- when we declare a method with same name and same parameter/signature in different classes is called run time polymorphism.
Basically, we override a method in the base class by creating a similar method in the derived class by doing inheritance and by using virtual and override keywords.

Code Snippet

public class ParentClass {

public virtual void Display()
{
Console.WriteLine("Parent Class method");
}

public class childclass : ParentClass /* inheriting parent class *\
  
{   

public override void Display()
  
{
  
Console.WriteLine("Child Class method");

}

}

Class Program

{

static void Main(string[] args)

{

ParentClass obj= new childclass();
obj.Display();
Console.ReadLine();

}
}
}

Output

Child Class method