Use Stack to determine whether it is a palindrome

//Use the Stack class to determine whether a string is a palindrome
#include<iostream>
#include<string.h>
#include<stdlib.h>
using namespace std;
const int Max_size=100;
class Student
{
private:
    int length;
    char *s;
public:
    Student()
    {
        s=new char[Max_size];
        length=0;
    }
    ~Student(){

        delete [] s;
    }
    void EnStudent(char str)
    {
        s[length++]=str;
    }
    char PrintStudent()
    {
        return s[--length];
    }
};
int main()
{
    char arr1[100];
    cin>>arr1;
    Student p;
    int l=strlen(arr1);
    for(int i=0;i<l/2;i++)
    {
        p.EnStudent(arr1[i]);
    }
    int idex=l/2;
    if(l%2==1){idex++;}
    for(int i=0;i<l/2;i++)
    {
        char a;
        a=p.PrintStudent();
        if(a!=arr1[idex++])
        {
            cout<<"no";
            return 0;
        }
    }
    cout<<"yes";
    return 0;
}