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Program Examples

1. Program to check entered number is palindrome or not

Steps

1. Accept number from user
2. Reverse the given number
3. Compare reverse number with given number

import java.util.Scanner;
public class NumberPalindromeEx 
{
	public static void main(String[] args) 
	{
		Scanner scan = new Scanner(System.in);
		int number = 0,temp=0,reversenum=0;
		int rem=0;
		
		System.out.print("\nEnter Number : ");
		number = scan.nextInt();
		temp = number;
		
		while(number>0)
		{
			rem = number % 10;
			reversenum = (reversenum * 10) + rem;
			number = number / 10;
		}
		System.out.println("Reverse is : "+reversenum);
		
		if(temp == reversenum)
			System.out.println(temp+" is palindrome number");
		else
			System.out.println(temp+" is NOT palindrome number");
	}
}

Output

Explanation

In above program, we have accepted input from user and stored it into the temporary variable. Because original number is get modified.

Next we have reversed the given number using simple while loop and stored that number into reversenum variable.

At last we have compared our given number (which is stored into temp variable) to reversenum for checking of palindrome.

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2. Program to check palindrome numbers from given Array

public class NumberPalindromeEx { public static void main(String[] args) { int numbers[]={12321,543,56765,4324},temp=0,reversenum=0; int rem=0; for(int i=0;i<numbers.length;i++) { temp = numbers [i]; while (numbers [i] > 0) { rem = numbers[i] % 10; reversenum = (reversenum * 10) + rem; numbers[i] = numbers[i] / 10; } if(temp == reversenum) System.out.println(temp+" is palindrome number\n"); else System.out.println(temp+" is NOT palindrome number\n"); reversenum = 0; // to clear previous value } } }

Output