Inheritance in C#

Single Level Inheitance: Inheriting Fields

using System;

namespace InheitanceCsharp
{
    public class Employee
    {
        public float salary = 40000;
 
    }

    public class Programmer : Employee
    {
        public float bonus = 10000;
    }
    
    class TestInheritance
    {
        public static void Main(string[] args)
        {
            Programmer p1=new Programmer();
            Console.WriteLine("Salary: "+p1.salary);
            Console.WriteLine("Bonus: "+p1.bonus);
            Console.ReadKey();
        }
    }
}

Single Level Inheritance: Inheriting Methods

using System;

namespace InheritMethod
{
    public class Animal
    {
        public void eat()
        {
            Console.WriteLine("Eating...");
        }
    }

    public class Dog : Animal
    {
        public void bark()
        {
            Console.WriteLine("Barking...");
        }
    }

    class TestInheritance
    {
        public static void Main(string[] args)
        {
            Dog d1=new Dog();
            d1.bark();
            d1.eat();
            Console.ReadKey();
        }
    }
}

Multilevel Inheritance:

//multiple inheritance is not supported in c# through class
//so it supports naturally multi level inheritance
//but we can use multiple inheritance using interface

using System;

namespace MultiLevelInheitance
{
    public class Animal
    {
        public void eat()
        {
            Console.WriteLine("Eating..");
        }

    }

    public class Dog : Animal
    {
        public void bark()
        {
            Console.WriteLine("Barking.....");
        }
    }

    public class BabyDog : Dog
    {
        public void weep()
        {
            Console.WriteLine("Weeping...");
        }
    }

    public class BabyBabyDog : BabyDog
    {
        public void Cry()
        {
            Console.WriteLine("Crying...");
        }
    }



    class TestInhertance
    {
        static void Main(string[] args)
        {
            BabyBabyDog bb=new BabyBabyDog();
            bb.eat();
            bb.bark();
            bb.weep();
            bb.Cry();
            Console.ReadLine();

        }
    }
}

Multiple Inheritance Through Interface:

//interface is just like class here

using System;

namespace MultipleInheritanceInterface
{
  
        interface calc1
        {
            int add(int a, int b);
        }

        interface calc2
        {
            int sub(int x, int y);
        }

        interface calc3
        {
            int mul(int r, int s);
        }

        interface calc4
        {
            int div(int c,int d);
        }

    class calculation : calc1, calc2, calc3, calc4
    {
        public int result1;

        public int add(int a, int b)
        {
            return result1 = a + b;
        }

        public int result2;

        public int sub(int x, int y)
        {
            return result2 = x - y;
        }

        public int result3;

        public int mul(int r,int s)
        {
            return result3 = r * s;
        }


        public int result4;
        public int div(int c, int d)
        {
            return result4 = c / d;
        }

    }

    class Program
    {

        static void Main(string[] args)
        {
            calculation c=new calculation();
            c.add(8, 2);
            c.sub(20, 10);
            c.mul(5,2);
            c.div(20, 10);

            Console.WriteLine("Multiple ineritance concept using interface:\n");

            Console.WriteLine("Addition:"+c.result1);
            Console.WriteLine("Substraction:"+c.result2);
            Console.WriteLine("Multiplication:"+c.result3);
            Console.WriteLine("Division:"+c.result4);
            Console.ReadKey();
        }
    }
}