example2_protected_inheritance.cpp

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#include <iostream>
#include <string>

class BankAccount {
private:
    std::string accountHolder;
    double balance;

public:
    BankAccount(const std::string& name, double initialBalance) 
        : accountHolder(name), balance(initialBalance) {}

    void deposit(double amount) {
        if (amount > 0) {
            balance += amount;
            std::cout << "Deposited: $" << amount << std::endl;
        }
    }

    void withdraw(double amount) {
        if (amount > 0 && amount <= balance) {
            balance -= amount;
            std::cout << "Withdrawn: $" << amount << std::endl;
        } else {
            std::cout << "Insufficient funds or invalid amount" << std::endl;
        }
    }

    void displayBalance() const {
        std::cout << "Account Holder: " << accountHolder << std::endl;
        std::cout << "Current Balance: $" << balance << std::endl;
    }
};

int main() {
    BankAccount account("John Doe", 1000.0);
    account.deposit(500.0);
    account.withdraw(200.0);
    account.displayBalance();

    // account.balance = 1000000; // This would cause a compilation error

    return 0;
}