checkPalindrome.cpp

// Given a string, determine if it is a palindrome, considering only alphanumeric characters.
// Palindrome
// A palindrome is a word, number, phrase, or other sequences of characters which read the same backwards and forwards.
// Example:
// If the input string happens to be, "malayalam" then as we see that this word can be read the same as forward and backwards, it is said to be a valid palindrome.

// The expected output for this example will print, 'true'.
// From that being said, you are required to return a boolean value from the function that has been asked to implement.
// Input Format:
// The first and only line of input contains a string without any leading and trailing spaces. All the characters in the string would be in lower case.
// Output Format:
// The only line of output prints either 'true' or 'false'.
#include <iostream>
#include <cstring>
using namespace std;

int length(char str[]){
  int len = 0;
  int i = 0;
  while(str[i] != '\0'){
    i++;
  }
  return i;
}

int checkPalindrome(char str[])
{
  	int i = 0, j = length(str) - 1;
		while(i < j){
			if(str[i] != str[j]){
				return 0;
			}
			i++;
			j--;
		}
		return 1;
}



int main() {
    int size = 1e6;
    char str[size];
    cin >> str;
    cout << (checkPalindrome(str) ? "true" : "false");
}