Write a function that checks if a given string is a palindrome or not.

Question

Accepted Answer

A program to check if a given string is a palindrome or not.

Convert the string to lowercase to ignore case sensitivity.
Remove all non-alphanumeric characters from the string.
Reverse the string and compare it with the original string.
If they are the same, then the string is a palindrome.

Accepted Answer

import java.util.*;

class PalindromeExample2

{

public static void main(String args[])

{

String original, reverse = ""; // Objects of String class

Scanner in = new Scanner(System.in);

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

original = in.nextLine();

int length = original.length();

for ( int i = length - 1; i >= 0; i-- )

reverse = reverse + original.charAt(i);

if (original.equals(reverse))

System.out.println("Entered string/number is a palindrome.");

else

System.out.println("Entered string/number isn't a palindrome.");

}

Accepted Answer

A palindrome number is a number that is same after reverse. For example 121, 34543, 343, 131, 48984 are the palindrome numbers.

Palindrome number algorithm

Get the number from user
Hold the number in temporary variable
Reverse the number
Compare the temporary number with reversed number
If both numbers are same, print palindrome number
Else print not palindrome number

Let's see the palindrome program in C. In this c program, we will get an input from the user and check whether number is palindrome or not.

 
#include  
int main()    
{    
int n,r,sum=0,temp;    
printf("enter the number=");    
scanf("%d",&n);    
temp=n;    
while(n>0)    
{    
r=n%10;    
sum=(sum*10)+r;    
n=n/10;    
}    
if(temp==sum)    
printf("palindrome number ");    
else    
printf("not palindrome");   
return 0;  
}   

Output:

enter the number=151
palindrome  number

enter the number=5621
not palindrome  number

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Accepted Answer

a="palidrom"

b=(a[-1::-1])

if a==b:

print("palidrome")

else:

print("not palidrome")

Asked in TCS and 8 others

Write a function that checks if a given string is a palindrome or not.

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