alphabet number or special char

#include<iostream>
using namespace std;

int main(){
    int n, i;
    cout << "Test cases =";
    cin >> n;
    char a[n + 1];

    for(i = 1; i <= n; i++){
       cin >> a[i];
    }
    for(i = 1; i <= n; i++){
        if(a[i] >= 48 && a[i] <= 57)
            cout << a[i] << " is a Digit" << endl;
        else if((a[i] >= 65 && a[i] <= 90) ||(a[i] >= 97 && a[i] <= 122))
            cout << a[i] << " is an Alphabet" << endl;
        else{
            cout << a[i] << " is special character" << endl;
        }

    }


    return 0;
}