. Palindrome Number Easy Topics Companies Hint Given an integer x, return true if x is a palindrome , and false otherwise. Example 1: Input: x = 121 Output: true Explanation: 121 reads as 121 from left to right and from right to left. Example 2: Input: x = -121 Output: false Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome. Example 3: Input: x = 10 Output: false Explanation: Reads 01 from right to left. Therefore it is not a palindrome. Constraints: -231 <= x <= 231 - 1
Question
. Palindrome Number Easy Topics Companies Hint Given an integer x, return true if x is a palindrome , and false otherwise.
Example 1:
Input: x = 121 Output: true Explanation: 121 reads as 121 from left to right and from right to left. Example 2:
Input: x = -121 Output: false Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome. Example 3:
Input: x = 10 Output: false Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
Constraints:
-231 <= x <= 231 - 1
Solution
Sure, here is a step by step solution in Python:
Step 1: First, we need to check if the number is negative. A negative number cannot be a palindrome because it has a negative sign at the beginning. So, if the number is less than 0, we return False.
def isPalindrome(x):
if x < 0:
return False
Step 2: Next, we convert the number to a string. This will allow us to easily reverse the string and compare it to the original string.
def isPalindrome(x):
if x < 0:
return False
else:
str_x = str(x)
Step 3: We then reverse the string using Python's slicing feature. The syntax str_x[::-1] means start at the end of the string and end at position 0, move with the step -1 (which means one step backwards).
def isPalindrome(x):
if x < 0:
return False
else:
str_x = str(x)
reversed_str_x = str_x[::-1]
Step 4: Finally, we compare the reversed string to the original string. If they are the same, the number is a palindrome and we return True. If they are not the same, the number is not a palindrome and we return False.
def isPalindrome(x):
if x < 0:
return False
else:
str_x = str(x)
reversed_str_x = str_x[::-1]
if str_x == reversed_str_x:
return True
else:
return False
This function will now correctly identify whether a given integer is a palindrome or not.
Similar Questions
Given an integer x, return true if x is a palindrome, and false otherwise.
class Solution { public boolean isPalindrome(int x) { String num =Integer.toString(x); for(int i=num.length()-1;i<0;i--){ String a =" "+num; if(num==a){ System.out.println("it is palindrome:"+a); }else{ System.out.println("it is not palindrome:"+a); } } }}
Write a C++ program to check if a given number is a palindrome. A palindrome is a number that remains the same when its digits are reversed.
Problem StatementSusi loves playing with numbers and exploring their unique properties. One day, she learned about palindromic numbers and decided to write a program to check if a given number is a palindrome or not. Can you help her accomplish this task using a while loop?Note: palindrome is a number that is the same when reversed. For example, 121, 1331, and 45654 are palindromic numbers.Input format :The input consists of a single integer, n, where n is the number that Susi wants to check for palindromic properties.Output format :The output displays one of the following messages:"Palindrome" if n is a palindrome."Not a Palindrome" if n is not a palindrome.Refer to the sample output for the formatting specifications.Code constraints :In this scenario, the test cases fall under the following constraints:11 ≤ n ≤ 106Sample test cases :Input 1 :2552Output 1 :PalindromeInput 2 :1234Output 2 :Not a PalindromeInput 3 :11Output 3 :PalindromeInput 4 :1000000Output 4 :Not a Palindrome
A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric characters include letters and numbers.Given a string s, return true if it is a palindrome, or false otherwise. Example 1:Input: s = "A man, a plan, a canal: Panama"Output: trueExplanation: "amanaplanacanalpanama" is a palindrome.Example 2:Input: s = "race a car"Output: falseExplanation: "raceacar" is not a palindrome.Example 3:Input: s = " "Output: trueExplanation: s is an empty string "" after removing non-alphanumeric characters.Since an empty string reads the same forward and backward, it is a palindrome. Constraints:1 <= s.length <= 2 * 105s consists only of printable ASCII characters.
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