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https://youtu.be/2wRndYdQ_fI rotate array in java

/* Question - 01

To Find Factorial Of A Number

*/

package ABC;

import java.util.*;

public class Hello

{
public static void main(String[] args)

{
Scanner s1 = new Scanner(System.in);

System.out.println("Enter The Value Of n :");

int n = s1.nextInt();

int fact = 1;

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

{
fact = fact * i;
}


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

}

/* Question - 02

Java Program To Reversing A Given Number

*/


package ABC;

import java.util.*;

public class Main {

public static void main(String[] args) {

Scanner s = new Scanner(System.in);

int num,rev=0,rem;

System.out.println("Enter The Number :");

num = s.nextInt();

System.out.println("Original Number: " + num);

while(num != 0) {

rem = num%10;

rev = rev*10+rem;

num = num/10;
}

System.out.println("Reversed Number: " + rev);
}
}

/* Question - 03

Java Program To Check Whether Given Number Is Palindrome Or Not

*/


package ABC;

import java.util.*;

public class Main {

public static void main(String[] args) {

int Num,Rem,Sum=0,Var;

Scanner s = new Scanner(System.in);

System.out.print("Enter The Number :");

Num = s.nextInt();

Var = Num;

while(Num!=0) {

Rem = Num%10;

Sum = Sum*10+Rem;

Num = Num/10;
}

if(Sum==Var)
{
System.out.println(Var+" Is A Palindrom Number");
}

else
{
System.out.println(Var+" Is Not A Palindrom Number");
}
}
}

☝️ Solution Video

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/* Question - 04

Java Program To Find Given Number Is Armstrong Number Or Not

*/

package ABC;

import java.util.*;

public class Main {

public static void main(String[] args) {

int Num,Rem,Sum=0,Var;

Scanner s = new Scanner(System.in);

System.out.print("Enter The Number :");

Num = s.nextInt();

Var = Num;

while(Num!=0) {

Rem = Num%10;

Sum = Sum+Rem*Rem*Rem;

Num = Num/10;
}

if(Sum==Var)
{
System.out.println(Var+" Is A Armstrong Number");
}

else
{
System.out.println(Var+" Is Not A Armstrong Number");
}
}
}

/* Question - 05

Java Program To Find The Sum Of Digits Of A Given Number

*/

package ABC;

import java.util.*;

public class Main {

public static void main(String[] args) {

int Num,Rem,Sum=0;

Scanner s = new Scanner(System.in);

System.out.print("Enter The Number :");

Num = s.nextInt();

while(Num!=0) {

Rem = Num%10;

Sum = Sum+Rem;

Num = Num/10;
}

System.out.println("Sum Of Digits Of A Number :"+Sum);
}
}

/* Question - 07

Java Program To Find Whether The Given Number Is Prefect Number Or Not

*/

package ABC;

import java.util.*;

public class Main {

public static void main(String[] args) {

int Num,Count=0,Sum=0,Var;

Scanner s = new Scanner(System.in);

System.out.print("Enter The Number :");

Num = s.nextInt();

Var = Num;

for(int i=1;i<Num;i++)
{
if(Num%i==0)
{
Sum = Sum + i;
}
}

if(Sum==Var)
{
System.out.println(Num+" Is A Perfect Number");
}

else
{
System.out.println(Num+" Is Not A Perfect Number");
}
}
}

/* Question - 06

Java Program To Find Quadratic Equations

*/

package ABC;

import java.lang.Math;

import java.util.*;

public class Main {

public static void main(String[] args) {

double A,B,C;

double P,Q;

Scanner s = new Scanner(System.in);

System.out.print("Enter The Value Of A :");

A = s.nextDouble();

System.out.print("Enter The Value Of B :");

B = s.nextDouble();

System.out.print("Enter The Value Of C :");

C = s.nextDouble();

double discrement = B*B-4*A*C;

if(discrement>0)
{
P = ((-B+Math.sqrt(discrement))/2*A);

Q = ((-B-Math.sqrt(discrement))/2*A);

System.out.printf("The Quadratic Equations Are P:"+P+" Q:"+Q);
}

else if (discrement == 0.0)
{
double r1 = -B / (2.0 * A);

System.out.println("The root is " + r1);
}
else
{
System.out.println("Roots are not real.");
}
}

}