How to check Palindrome Number || Basic Programming Questions Series

In this video, we will learn how to write a program to check the given number is Palindrome or not.

Learn:
1. check the given number is Palindrome or not.
2. write different test cases

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[guddipatel]

Great Tutorial but your program won't work if the given number is Negative, for eg: -121 or so....so in a while loop instead of (num > 0) use while(num != 0) and it will work for all the test cases

[sumitsaha]

private boolean isPalindrome(String str) {
String revStr = new //can also use StringBuilder instead of StringBuffer
return
}

[luckylily]

Thank you... U thought nicely.. Can u make more videos of stings, arrays, nd patterns..

sir i hope would u complete programming video series at least 50-60 program mainly from string & array

[ramkumarreddy]

Palindrome String program:
public class PalindromeString {

public static void isPalindromeString(String name) {
String rev = " ";
int length = name.length();
for (int i = length - 1; i >= 0; i--) {
rev = rev + name.charAt(i);
}
System.out.println("The reverse of the name - " + rev);
if (rev.equals(name)) {
System.out.println(rev+ " - is a polindrome");
} else
System.out.println(rev+ " - not a polindrome");

}

public static void main(String[] args) {
isPolindromeString("MADAM");
isPolindromeString("Madam");

}
}

[maafaque]

public static void isPalindromeString(String name) {
String original=name;
int length=name.length();
String reverseString="";
System.out.println("Lenght of String:"+length);
for(int i=length-1;i>=0;i--) {


}
"+reverseString);

{
System.out.println("Its a Palindrom String");
} else {
System.out.println("Not a Palindrom String");
}
}

[kapilrana]

Hi Naveen, Just wanted to know, Can we write the above program in below way. Or what an interviewer can say if I give the below answer. Please suggest and let me know what is the issue in this.


public class PalindromeNumber {

public static void main(String[] args)
{

int a = 252;

String b = String.valueOf(a);

StringBuffer sb = new StringBuffer(b);
StringBuffer c = sb.reverse();
String d = c.toString();

if (b.equals(d))
{
System.out.println("the number is palindrome number");
}

else
{
System.out.println("The number is not a palindrome number");
}

}

}

[abraham]

Without reverse method
String original, reverse = ""; 

      Scanner in = new Scanner(System.in);

     

      System.out.println("Enter a string to check if it is a palindrome");

      original = in.nextLine();

     

   

     

   

       

         

   

         System.out.println("The string is a palindrome.");

      else

         System.out.println("The string isn't a palindrome.");

            }

[anushaka]

public static void StringRev(String string){
String t;
t=string;


StringBuffer reversestring = new

{
System.out.println("It is a PALINDROME");
}
else {
System.out.println("It is NOT a PALINDROME");
}

[_SinManya]

I have one doubt: Is '1001' is a palindrome (Note the single quotes before answering)?It would be very nice if you can show the program using strings.

[tejastoley]

StringBuffer sb = new StringBuffer("Tejas");
sb.append("Toley");

[shankarpk]

An alternate approach - Single program for both integers and strings


package largestNumber;
import java.util.Scanner;
public class Palindrome {


public static int[] checkPalindrome(Object x) {

int flag = 0;

int a[] = new int[2];

String str = String.valueOf(x);

int length = str.length();

if (length % 2 == 0) {

for (int i = 0; i < (length / 2); i++) {

if (str.toUpperCase().charAt(i) == - i - 1)) {

flag++;
}
}

}

else {

for (int i = 0; i < (int) (length / 2); i++) {

if (str.toUpperCase().charAt(i) == - i - 1)) {

flag++;
}
}

}

a[0] = length;
a[1] = flag;

return a;

}

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("ENTER SOMETHING");

Object x = sc.nextLine();

System.out.println(x);

int[] b = checkPalindrome(x);

if (b[1] == (int) (b[0] / 2)) {

System.out.println(x + " IS A PALINDROME");
}

else {

System.out.println(x + " IS NOT A PALINDROME");
}

}

}

[yolwasmirzat]

Hello, if you have time can you please cover Anagram, Duplicate Word, Permutation, Determined Largest Word please, Thank you

[shwetapandey]

i tried this code this is also working

public static void checkPalindrom(int x) {
int num = x;

ArrayList<Integer> arr=new ArrayList<Integer>();


while(num>0) {

arr.add(num%10);
num=num/10;
}
int c=0;
int i=0;
int j=arr.size()-1;
while(i<arr.size()) {
if(arr.get(i)!=arr.get(j)) {
c=1;

break;
}
i++;
j--;
}
if(c==0) {
System.out.println("this number is a palindrome");
}
else {
System.out.println("this number is not a palindrome");
}
}

[abineshm]

hi sir, how to write a code to separate number, alphabhaet, special character from a ...
string input = (a24js7f.%^
output =ajsf
247
(.%^
this was asked in recent interview, please explain

[raghuveermh]

Solution for String Palindrome


public static void isPalindrome(String a){


String b = " ";


int n = a.length();


for(int i = n-1; i>=0;i--){
b = b+a.charAt(i);
}


if(a.equalsIgnoreCase(b)){
System.out.Println("The enterd String is Palindrome);
}
else{
System.out.println("The enterd String is not a palindrome");
}
}


Call this into the Main Method and pass the input String...

[asheshrastogi]

To check if a given String is Palindrome


public class PalindromeString {

public static boolean isPalindrome(String str) {
String rev = "";

for(int i = str.length()-1; i>=0; i--) {
rev = rev+str.charAt(i);
}

if(rev.equals(str)) {
return true;
}
return false;
}

public static void main(String[] args) {
// TODO Auto-generated method stub

System.out.println("'radar' is a Palindrome: " + isPalindrome("radar"));
is a Palindrome: " + isPalindrome("selenium"));
System.out.println("'level' is a Palindrome: " + isPalindrome("level"));
}

}

[renukachavan]

Program to check if a string is palidrome or not :
public class PalindromeString {

public static void isPalindromeString(String s) {
System.out.println("Given string is :" + s);
// reverse the given String
String reverse = new

// check whether the string is palindrome or not
if (s.equals(reverse)) {
System.out.println("a Palindrome string");
}
else
System.out.println("not a palindrome string");
}

public static void main(String args[])
throws java.lang.Exception

{
isPalindromeString(" madam ");
isPalindromeString(" malayalam ");
isPalindromeString(" renuka ");
isPalindromeString(" abbc ");
}
}

[srinivasmuddappa]

If we give any palindrome number starting with 0 this logic does not work example 012210

[shyamchristypaul]

public class PalindromeClass {
public void isPalindromString(String str1) {
String str2= "";
int i = str1.length();
for(i =str1.length()-1;i>=0;i--)
{
str2 = str2+str1.charAt(i);
}


if (str1.equals(str2))
{
System.out.println("This is a Palindrome String");
}
else
{
System.out.println("This is not a Palindrome String");
}



}
public static void main(String[] args) {

PalindromeClass obj =new PalindromeClass();


}

}