Cpp program to check whether string is a palindrome or not

Write a program to check whether string is a palindrome or not

#include <iostream>
using namespace std;
int main()
{
    char name[20];
    int a, b, flag = 0;
    cout << "Enter your name (in uppercase or lowercase): ";
    cin.getline(name, 20);
    int len = 0;
    for (a = 0; name[a] != '\0'; a++)
    {
        len++;
    }
    b = len - 1;
    for (a = 0; a < len; a++)
    {
        if (name[a] != name[b])
        {
            flag = 1;
            break;
        }
        b--;
    }
    if (flag == 1)
    {
        cout << "String is not a palindrome";
    }
    else
    {
        cout << "String is a palindrome" << endl;
    }
    return 0;
}

Enter your name (in uppercase or lowercase): HANNAH

String is a palindrome