Build a BankAccount class

Description: Make a class BankAccount with a private balance. Add deposit and withdraw. Throw an exception for a negative deposit and for a withdraw bigger than the balance.

Hint:

• Use std::invalid_argument and std::runtime_error.

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Solution

#include <iostream>
#include <stdexcept>

class BankAccount {
public:
    void deposit(double amount) {
        if (amount <= 0) throw std::invalid_argument("Deposit must be positive");
        balance += amount;
    }
    void withdraw(double amount) {
        if (amount > balance) throw std::runtime_error("Not enough balance");
        balance -= amount;
    }
    double get_balance() const { return balance; }
private:
    double balance = 0;
};

int main() {
    BankAccount acc;
    acc.deposit(1000);
    acc.withdraw(250);
    std::cout << acc.get_balance() << '\n';
    try {
        acc.withdraw(5000);
    } catch (const std::exception& e) {
        std::cout << "Error: " << e.what() << '\n';
    }
    try {
        acc.deposit(-5);
    } catch (const std::exception& e) {
        std::cout << "Error: " << e.what() << '\n';
    }
}

How it works

• The balance is private, so only the two methods can change it, and both check the value.

Read Encapsulation.

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