Challenge: Bank Account

Lab C++ Intermediate 20 points

Write a BankAccount class with a private balance starting at 0. Read n commands, each deposit X or withdraw X. A withdrawal bigger than the balance must be refused: print Refused: X. At the end print Balance: B.

Input

n, then n commands.

Output

One Refused line for each refused withdrawal, then the balance line.

Example

Input

4
deposit 100
withdraw 30
withdraw 200
deposit 5

Output

Refused: 200
Balance: 75

Sample input available Sample output available

Editor

C++

Hints

withdraw can return a bool: true if it worked.

Read each command as a string and a number.

Solution explanation

Because balance is private, the only way to change it is through deposit and withdraw, which enforce the rules.

Show solution

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

class BankAccount {
private:
    int balance = 0;

public:
    void deposit(int amount) {
        balance += amount;
    }

    bool withdraw(int amount) {
        if (amount > balance) {
            return false;
        }
        balance -= amount;
        return true;
    }

    int getBalance() const {
        return balance;
    }
};

int main() {
    int n;
    cin >> n;
    BankAccount acc;
    for (int i = 0; i < n; i++) {
        string command;
        int amount;
        cin >> command >> amount;
        if (command == "deposit") {
            acc.deposit(amount);
        } else if (!acc.withdraw(amount)) {
            cout << "Refused: " << amount << "\n";
        }
    }
    cout << "Balance: " << acc.getBalance() << "\n";
    return 0;
}

Output

Answer