Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

#include <iostream>
#include <string>
#include <stdexcept>

class BankAccount {
public:
    // Constructor — public interface for creation
    explicit BankAccount(const std::string& owner, double initial = 0.0)
        : owner_(owner), balance_(initial) {
        if (initial < 0) throw std::invalid_argument("Negative balance");
    }

// Public accessors (getters)
    std::string owner()  const { return owner_;  }
    double      balance() const { return balance_; }

// Public mutators with validation
    void deposit(double amount) {
        if (amount <= 0) throw std::invalid_argument("Amount must be positive");
        balance_ += amount;
    }

void withdraw(double amount) {
        if (amount <= 0) throw std::invalid_argument("Amount must be positive");
        if (amount > balance_) throw std::runtime_error("Insufficient funds");
        balance_ -= amount;
    }

private:
    std::string owner_;   // private data
    double      balance_; // private data

// Private helper — not part of public API
    void log(const std::string& msg) const {
        std::cout << "[" << owner_ << "] " << msg << "
";
    }
};

int main() {
    BankAccount acc("Alice", 1000.0);
    acc.deposit(250.0);
    acc.withdraw(100.0);
    std::cout << acc.owner() << " balance: " << acc.balance() << "
";
    return 0;
}