class Hello {

public static void main(String args[]) {

System.out.println("Hello World !");

}

}

class Sum {

public static void main(String args[]) {

int num1,num2,sum;

num1=5;

num2=6;

sum = num1+num2;

System.out.println("Sum is "+ sum);

}

}

import java.util.Scanner;

class SumUserChoice {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in);

int num1,num2,sum;

System.out.println("Enter the first number : ");

num1 = readin.nextInt();

System.out.println("Enter the second number : ");

num2 = readin.nextInt();

sum = num1+num2;

System.out.println("Sum is "+sum);

}

}

import java.util.Scanner;

class NumberComparision {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in);

int num1,num2;

System.out.println("Enter the first number:");

num1 = readin.nextInt();

System.out.println("Enter the second number:");

num2 = readin.nextInt();

if(num1>num2) {

System.out.println(num1+" is greater than "+ num2);
}

else {

System.out.println(num1+ " is less than "+ num2);

}

}

}

import java.util.Scanner;

class EvenOrOdd {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in);

int num;

System.out.print("Enter the number to check number is even or odd :");

num = readin.nextInt();

if(num%2==0) {

System.out.println(num+" is a even number .");

} else {

System.out.println(num+" is a odd number .");

}

}

}

import java.util.Scanner;

class Factorial {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in);

System.out.println("Enter the number to find the factorial :");

int num = readin.nextInt();

for(int i=num;i>0;i--)

{

int fact = fact * i;

}

System.out.println("Factorial of "+num+" is "+fact);

}

}

import java.util.Scanner;

class Palindrome {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in);

System.out.println("Enter the number to check the number is palindrome or not :");

int num = readin.nextInt();

int no=num;

while(num>0)

{

int re=num%10;

int palin=re+(palin*10);

num=num/10;

}

if(no == palin) {

System.out.println(no+" is a palindrome number.");

}

else {

printf(no+" is not a palindrome number.");

}

}

}

import java.util.Scanner;

class Armstrong {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in);

int no,num,mul=1,sum=0,i,re;

System.out.println("Enter the number to check the number is armstrong or not :");

num = readin.nextInt();

no=num; while(num>0) {

re = num%10;

for(i=0;i<3;i++)

{

mul=mul*re;

}

sum=sum+mul;

num=num/10;

mul=1;

}

if(no == sum) {

System.out.println(no+" is a Armstrong number .");

} else {

System.out.println(no+" is not a Armstrong number .");

}

}

}

import java.util.Scanner;

class ReverseNumber {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in);

System.out.println("Enter the number :");

int num = readin.nextInt();

while(int no>0) {

int re=no%10;

int rev=re+(rev*10);

no=no/10;

}

System.out.println("Reverse of "+num+" is "+rev);

}

}

import java.util.Scanner;

class SwappingThirdVar {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in);

System.out.println("Enter the first number:");

int num1 = readin.nextInt();

System.out.println("Enter the second number");

int num2 = readin.nextInt();

int temp = num1;

num1 = num2;

num2 = temp;

System.out.println(" num1 is "+num1+"\n num2 is"+num2);

}

}

import java.util.Scanner;

class SwappingWithoutUsingThirdVar {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in);

System.out.println("Enter the first number:");

int num1 = readin.nextInt();

System.out.println("Enter the second number");

int num2 = readin.nextInt();

num1=num1+num2;

num2 = num1-num2;

num1 = num1-num2;

System.out.println(" num1 is "+num1+"\n num2 is"+num2);

}

}

import java.util.Scanner;

class FabonacciSeries {

public static void main(String args[]) {

Scanner raedin = new Scanner(System.in);

System.out.println("Enter the range :");

int range = readin.nextInt();

Systme.out.println("Fabonnaci sereis is :");

int num1 = 0,num2 = 1;

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

System.out.print(num1+" ");

num1=num2;

int fab=num1+num2;

num2=fab

}

}

}

import java.util.Scanner;

class Average {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in);

System.out.print("Enter the numbers :");

int num1 = readin.nextInt();

int num2 = readin.nextInt();

int num3 = readin.nextInt();

int avg = (num1+num2+num3)/3;

System.out.println("Average of numbers is "+avg);

}

}

import java.util.Scanner;

class Factors {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in);

System.out.println("Enter the number :");

int num = readin.nextInt(); System.out.println("Factors of "+num+"are");

for(int i=1 ;i<=num ; i++)

{

if(num%i==0)

{

System.out.print(i+" ");

}

}

}

}

import java.util.Scanner;

class PowerOfInteger {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in);

System.out.println("Enter the integer number :");

int num = readin.nextInt();

System.out.println("Enter the power number :");

int pow = readin.nextInt();

for(int i=0;i<pow;i++)

{

int res=res*num;

}

System.out.println("Result is "+pow);

}

}

import java.util.Scanner;

class Area {

public static void main(String args[]) {

Scanner readin = new Scanner(System.in)

System.out.println("Enter the height of triangle :");

int height = readin.nextInt();

System.out.println("Enter the base of triangle :");

int base = readin.nextInt();

ar = (base*height)/2;

System.out.println("Area of triangle is :"+ar);

}

}