check if a string is palindrome cpp

1// Check whether the string is a palindrome or not.
2#include <bits/stdc++.h>
3
4using namespace std;
5
6int main(){
7    string s;
8    cin >> s;
9    
10    int l = 0;
11    int h = s.length()-1;
12
13    while(h > l){
14        if(s[l++] != s[h--]){
15            cout << "Not a palindrome" << endl;
16            return 0;
17        }
18    }
19    cout << "Is a palindrome" << endl;
20    return 0;
21
22}