CODEWITHSUNDEEP
javapalindrome
Virangaa
Virangaa

Reputation: 159

Finding palindrome number in java

import java.util.*;
class Example{
    public static void main(String args[]){
        Scanner input=new Scanner(System.in);
        System.out.print("Input a prefer number :");
        int num=input.nextInt();
        int reverse=0;
        while(num!=0){
            int num1=num%10;
            reverse=(reverse*10)+num1;
            num/=10;
        }

        System.out.println("Reverse num is "+reverse);
        if(num==reverse){
            System.out.println("The number is palindrome");
        }else{
            System.out.println("Try again");
        }
    }
}

I want to confirm whether it is a palindrome number or not when I input a number by the keyboard.But I couldn't get it.In the 7th line of my code,I've initialized variable "reverse" as 0.So when I make a condition in 14th line,"reverse" acts as 0.That is what should be,but i want to make "reverse" equal to the value which gets in line 10.What should I do ?

Upvotes: 0

Views: 91

Answers (2)

WJS
WJS

Reputation: 40034

You might consider treating the number as a string.

  1. It allows arbitrarily large numbers.
  2. You can then use StringBuilder to reverse the string.
            Scanner input=new Scanner(System.in);
            System.out.print("Input a preferred number :");
            String str = input.nextLine();
            StringBuilder sb = new StringBuilder(str);
            String reverse = sb.reverse().toString();
            System.out.println("Reverse num is "+reverse);
            if(str.equals(reverse)){
                System.out.println("The number is palindrome");
            }else{
                System.out.println("Try again");
            }
        }

Upvotes: 0

Adnan
Adnan

Reputation: 496

Assign num to another variable as its get changed 

import java.util.*;
class Example{
public static void main(String args[]){
    Scanner input=new Scanner(System.in);
    System.out.print("Input a prefer number :");
    int num=input.nextInt();
    int number  = num ; // assign to anaother variable as num gets changed 
    int reverse=0;
    while(num!=0){
        int num1=num%10;
        reverse=(reverse*10)+num1;
        num/=10;
    }

    System.out.println("Reverse num is "+reverse);
    if(number==reverse){
        System.out.println("The number is palindrome");
    }else{
        System.out.println("Try again");
    }
}

}

Upvotes: 2

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