Programming In Java.

String Reverse Program In Java.

Code:-
import java.util.Scanner;
class Reverse
{
public static void main(String[] s)
{
Scanner sc=new Scanner(System.in);
String str=sc.nextLine();
for(int i=str.length()-1;i>=0;i--)
{
System.out.print(str.charAt(i));
}
}
}

Palindrome Number Program In Java.

Code:-

import java.util.Scanner;

class Palindrome

{

static int temp,num,rnum=0,digit;

public static void main(String[] s)

{

Scanner sc=new Scanner(System.in);

num=sc.nextInt();

temp=num;

do

{

digit=temp%10;

temp=temp/10;

rnum=rnum*10+digit;

}

while(temp>0);

if(rnum==num)

{

System.out.println("Number is palindrome");

}

else

{

System.out.println("Number is not palindrome");

}

}

}

Armstrong Number Program In Java

Code:-

import java.util.Scanner;

class Armstrong

{

static int temp,num,rnum=0,digit;

public static void main(String[] s)

{

Scanner sc=new Scanner(System.in);

num=sc.nextInt();

temp=num;

do

{

digit=temp%10;

temp=temp/10;

rnum=rnum+digit*digit*digit;

}

while(temp>0);

if(rnum==num)

{

System.out.println("Number is Armstrong:");

}

else

{

System.out.println("Number is not Armstrong:");

}

}

}