JAVA

    **********************  JAVA PROGRAMS*****************
 1)BufferedReader

import java.io.*;
import java.util.*;

class bufferedreader
{
        public static void main(String args[])throws IOException
        {
                BufferedReader obj1=new BufferedReader(new InputStreamReader(System.in));
                int number1=Integer.parseInt(obj1.readLine());
                float float_value=Float.parseFloat(obj1.readLine());
                double double_value=Double.parseDouble(obj1.readLine());
                char ch=obj1.readLine().charAt(0);
                String str=obj1.readLine();
                System.out.println(number1);
                System.out.println(float_value);
                System.out.println(double_value);
                System.out.println(ch);
                System.out.println(str);
        }
}
2)Scanreader

import java.io.*;
import java.util.*;

class scanreader
{
        public static void main(String args[])
        {
                Scanner obj1=new Scanner(System.in);
                int integer=obj1.nextInt();
                float float_value=obj1.nextFloat();
                double double_value=obj1.nextDouble();
                char ch=obj1.next().charAt(0);
                String str=obj1.next();
                System.out.println(integer);
                System.out.println(float_value);
                System.out.println(double_value);
                System.out.println(ch);
                System.out.println(str);
        }
}
3)FUNCTION

import java.io.*;
import java.util.*;

class fun1
{
        void add(int a,int b)
        {
                System.out.println(a+b);
        }
}

class functions
{
        void add(int a,int b)
        {
                System.out.println(a+b);
        }
        public static void main(String args[])
        {
                functions f=new functions();
                fun1 f2=new fun1();
                f.add(10,20);
                f2.add(20,30);
        }
}
4)PRIMENUMBER CHECK

import java.io.*;
import java.util.*;

class prime
{
        public static void main(String input_array[])
        {
                int number,flag=0,f;
                Scanner n=new Scanner(System.in);
                number=n.nextInt();
                if(number==1)
                {
                        System.out.println("Not a Prime Number");
                }
                else
                {
                        for(f=2;f<number;f++)
                        {
                                if(number%f==0)
                                {
                                        flag=1;
                                        break;
                                }
                        }
                        if(flag==1)
                        {
                              System.out.println("Not a Prime Number");
                        }
                        else
                        {
                                System.out.println("Prime Number");
                        }
                } 
               
        }
}
5)PALINDROME CHECK

import java.io.*;
import java.util.*;

class lovely
{
        public static void main(String args[])
        {
                Scanner obj1=new Scanner(System.in);
                int number=obj1.nextInt();
                int number_cpy=number,rev=0;
                for(;number>0;)
                {
                        rev=(rev*10)+(number%10);
                        number=number/10;
                }
                if(rev==number_cpy)
                {
                        System.out.println("Palindrome");
                }
                else
                {
                        System.out.println("Not a palindrome");
                }
        }
}
6)PERFECT NUMBER CHECK

import java.io.*;
import java.util.*;
class honey
{
        public static void main(String args[])
        {
                Scanner obj1=new Scanner(System.in);
                int number=obj1.nextInt();
                int sum=0,factor;
                for(factor=1;factor<number;factor++)
                {
                        if(number%factor==0)
                        {
                                sum=sum+factor;
                        }
                }
                if(sum==factor)
                {
                        System.out.println("Perfect");
                }
                else
                {
                        System.out.println("Not a Perfect");
                }
        }
}
7)ARMSTRONG NUMBER

import java.io.*;
import java.util.*;

class armstrong
{
        public static void main(String args[])
        {
                Scanner obj1=new Scanner(System.in);
                System.out.println("Enter the number");
                int number=obj1.nextInt();
                int sum=0,c=0,number_cpy1=number,number_cpy2=number;
                for(;number_cpy1>0;)
                {
                        c=c+1;
                        number_cpy1=number_cpy1/10;
                }
                for(;number_cpy2>0;)
                {
                        int temp=number_cpy2%10,c1;
                        for(c1=c;c1>1;c1--)
                        {
                                temp=temp*(number_cpy2%10);
                        }
                        sum=sum+temp;
                        number_cpy2=number_cpy2/10;
                }
                if(sum==number)
                {
                        System.out.println("Armstrong number");
                }
                else
                {
                        System.out.println("Not an Armstrong number");
                }
        }
}
8)FIBONACCI SERIES
import java.util.*;
import java.io.*;
class fibb
{
    public static void main(String args[])
    {
    int a=0,b=1,c,i;
    System.out.print("enter the n value");
    Scanner scan=new Scanner(System.in);
    int n=scan.nextInt();
    System.out.println("\n" +a);
    System.out.println("\n" +b);
    for(i=2;i<n;i++)
    {
        c=a+b;
        a=b;
        b=c;
        System.out.println("\n" +c);
    }
}
}
9)FACTORIAL  PROGRAM

import java.util.*;
import java.io.*;
class factorial
{
    public static void main(String args[])
    {
    int fact=1;
    System.out.print("enter n value");
    Scanner scan=new Scanner(System.in);
    int n=scan.nextInt();
    while(n>0)
    {
        fact=fact*n;
        n--;
    }
System.out.println(+fact);
}}