I have a simple question for beginners of c++ Array.

#include <iostream>
#include <string>
using namespace std;

int main() {

    int arrayName[3] = { 1, 2, 3 };
    cout << arrayName[2] << endl;
    cout << "Array size is " << **arrayName**.size() << endl;
    string input_string;
    cout << "Type something: ";
    getline(cin, input_string);
    cout << "Hello, World." << endl;
    cout << "This is what you typed: ";
    cout << input_string << endl;
    input_string.erase(input_string.begin() + 1, input_string.end() - 1);
    cout << input_string;


    return 0;
}