using System;

delegate int NumberChanger(int n);      

public class Program

{

     class NumberClass

    {

        public int number = 10;

    }

    class Student {

        private string name = "poorna";

        public void print() {

          Console.WriteLine("Hello from Student "+ name);

         }

     }

      interface IAnimal 

      {

        void animal(); 

      }

​

      class Tiger : IAnimal 

      {

        public void animal() 

        {

          Console.WriteLine("example of interface");

        }

      }

      static int num = 10;

      public static int AddNum(int p) {

         num += p;

         return num;

      }

      public static int getNum() {

         return num;

      }

    class GenericClass<T>  

    {  

        public GenericClass(T msg)  

        {  

            Console.WriteLine(msg);  

        }  

    }  

    public static void Main()

    {

        Console.WriteLine("\n Break");

        for(int i=0; i<10; i++) {

            if(i==4){

                break;

            }

            Console.WriteLine(i);   

        }

        Console.WriteLine("\n Continue");

        for( int i=0; i<8;i++){

            if(i==6){

                continue;

            }

            Console.WriteLine(i);

        }

        Console.WriteLine("\n Public");

        NumberClass num = new NumberClass();

        Console.WriteLine(num.number);

        Console.WriteLine("\n private");

        Student student1 = new Student();

        student1.print();

        Console.WriteLine("\n Interface");

        Tiger myObj = new Tiger();  

        myObj.animal();

        int result = 0;

        int num1 = 25;

        int num2 = 5;

         try {

            result = num1 / num2;

         } catch (DivideByZeroException e) {

            Console.WriteLine("Exception caught: "+ e);

         } finally {

            Console.WriteLine("Result: "+ result);

         }

         NumberChanger nc1 = new NumberChanger(AddNum);

        nc1(25);

         Console.WriteLine("Value of Num: "+ getNum());

        GenericClass<string> gen   = new GenericClass<string> ("This is generic class");  

        GenericClass<int>    genI  = new GenericClass<int>(101);  

        string val = new string('r', int.MaxValue); //System.OutOfMemoryException

        string value = null;

        if (value.Length == 0) //System.NullReferenceException

        {

            Console.WriteLine(value);

        }

        string[] arr1 = { "Welcome", "to", "CSharp" };

        object[] arr2 = arr1;

        arr2[0] = 8; //System.ArrayTypeMismatchException

    }

}