Check if the Character Array is Palindrome or not

//PRACTISE BY OWN

#include<iostream>
using namespace std;

char toLowercase(char ch){
    
    if(ch>='a' && ch<='z'){
        return ch;
    }
    else{
        // int temp=ch-'A'+'a';     //1st formula
        // int temp= ch+32;         //2nd formula
        // return temp;


         // third Method
         return ch |' ';              //Convert upper to lower
        // return ch&'_';             //Convert lower to upper
    }
}



bool isPalindrome(string str){
    int s=0;
    int e=str.size()-1;
    while(s<e){

        // while(str[s]>=1 && str[s]<=9  || str[e]>=1 && str[e]<=9){
        //     s++;
        //     e--;
        // }
        
        if(toLowercase(str[s])==toLowercase(str[e])){
            s++;
            e--;
        }
        
        else{
            return false;
        }
    }
    return true;
}


int main(){
    system("CLS");
    char ch[100];
    cout<<"Enter the word to check palindrome: ";
    cin>>ch;

    if(isPalindrome(ch)){
        cout<<"yes it is palindrome!!!!";
    }
    else{
        cout<<"Not palindrome!!!!!";
    }

    cout<<"\nCharacter is:" << toLowercase('c');
    cout<<"\nCharacter is:" << toLowercase('Z');
    return 0;
}