 Write a program that asks user to enter 2 numbers and print their addition,

subtraction, multiplication, division and remainder.

import java.util.*;
class A
{
public static void main (String args[])
{
Scanner sc1 = new Scanner(System.in);
Scanner sc2 = new Scanner(System.in);
int num1,num2,add,sub,mul,rem;
double div;
System.out.println("Enter First Number:");
num1= sc1.nextInt();
System.out.println("Enter Second Number:");
num2= sc2.nextInt();
add=num1+num2;
System.out.println("Addition : " +add);
sub=num1-num2;
System.out.println("Substraction : " +sub);
mul=num1*num2;
System.out.println("Multiplication : " +mul);
div=num1/num2;
System.out.println("Division : " +div);
rem=num1%num2;
System.out.println("Remainder : " +rem);

}
 Write a program that asks the user to enter 3 numbers and prints the
greatest number.

import java.util.*;
class B
{

public static void main (String args[])

{
Scanner sc1= new Scanner(System.in);
Scanner sc2= new Scanner(System.in);
Scanner sc3= new Scanner(System.in);
int a,b,c;
System.out.println("Enter A:");
a = sc1.nextInt();
System.out.println("Enter B:");
b = sc2.nextInt();
System.out.println("Enter C:");
c = sc3.nextInt();

System.out.println("****Program of Greatest Number From Three

Number****");

if(a>b)
{
if(a>c)
{
System.out.println("A= "+a+" is Greatest");
}
else
{
System.out.println("C= "+c+" is Greatest");
}
}
else
{
if(b>c)
{
System.out.println("B= "+b+" is Greatest");
}
else
{
System.out.println("C= "+c+" is Greatest");
}
}
}
}
 Write a program that accepts a number from the user and checks
whether it is a Palindrome number.

import java.util.*;
class C
{
public static void main(String args [])
{
Scanner sc = new Scanner(System.in);
int num,rev=0,org,remainder;
System.out.println("Enter Number:");
num= sc.nextInt();
org=num;
while(num>0)
{

remainder=num%10;
rev=rev*10+remainder;
num=num/10;

}
if(org==rev)
{
System.out.println("Number is Pallindrome!");
}
else
{
System.out.println("Number is Not Pallindrome!");
}
}

}
 Write a program that accepts a number from the user and checks
whether it is an Armstrong number.
import java.util.Scanner;

public class D {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int number = scanner.nextInt();

if(isArmstrong(number)) {
System.out.println(number + " is an Armstrong number.");
} else {
System.out.println(number + " is not an Armstrong number.");
}

scanner.close();
}

public static boolean isArmstrong(int number) {

int originalNumber = number;
int numberOfDigits = String.valueOf(number).length();
int sum = 0;

while(number > 0) {
int digit = number % 10;
sum += Math.pow(digit, numberOfDigits);
number /= 10;
}

return originalNumber == sum;

}
}
 Write a program that ask user to enter a number and checks whether
it is prime or not.

import java.util.Scanner;

public class PrimeNumber {

public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int number = scanner.nextInt();

if (isPrime(number)) {
System.out.println(number + " is a prime number.");
} else {
System.out.println(number + " is not a prime number.");
}

scanner.close();
}

public static boolean isPrime(int number) {

if (number <= 1) {
return false; // 0 and 1 are not prime numbers
}

if (number <= 3) {
return true; // 2 and 3 are prime numbers
}

if (number % 2 == 0 || number % 3 == 0) {
return false; // numbers divisible by 2 or 3 are not prime
}

// check for divisibility by numbers other than 2 and 3

for (int i = 5; i * i <= number; i += 6) {
if (number % i == 0 || number % (i + 2) == 0) {
return false;
}
}

return true;
}
}
 Write a program that ask user to enter a number and prints even
numbers from 0 upto that number.

import java.util.Scanner;

public class F {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int number = scanner.nextInt();

System.out.println("Even numbers from 0 to " + number + " are:");

for (int i = 0; i <= number; i += 2) {
System.out.print(i + " ");
}

scanner.close();
}
}
 Write a program that ask user to enter a number and prints the
factorial of that number.

import java.util.Scanner;

public class G {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
int number = scanner.nextInt();

long factorial = Fact(number);

System.out.println("Factorial of " + number + " is: " + factorial);

scanner.close();
}

public static long Fact(int number) {

if (number < 0) {
throw new IllegalArgumentException("Factorial is not defined for negative numbers.");
}

if (number == 0 || number == 1) {
return 1;
}

return number * Fact(number - 1);

}
}