Mini Project: Bank Account System

#include <iostream>
#include <vector>
#include <string>
#include <stdexcept>
#include <algorithm>
#include <iomanip>
using namespace std;

struct Transaction {
    string type;
    double amount;
    double balance_after;
};

class Account {
    string id;
    string owner;
    double balance;
    vector<Transaction> history;

public:
    Account(const string& id, const string& owner, double initial = 0.0)
        : id(id), owner(owner), balance(initial) {}

    void deposit(double amount) {
        if (amount <= 0) throw invalid_argument("Deposit amount must be positive");
        balance += amount;
        history.push_back({"deposit", amount, balance});
    }

    void withdraw(double amount) {
        if (amount <= 0) throw invalid_argument("Withdrawal amount must be positive");
        if (amount > balance) throw runtime_error("Insufficient funds");
        balance -= amount;
        history.push_back({"withdrawal", amount, balance});
    }

    void printStatement() const {
        cout << "
=== Account Statement ===
";
        cout << "ID: " << id << " | Owner: " << owner << "
";
        cout << fixed << setprecision(2);
        cout << "Balance: $" << balance << "

";
        cout << left << setw(12) << "Type"
             << right << setw(10) << "Amount"
             << right << setw(12) << "Balance" << "
";
        cout << string(36, '-') << "
";
        for (const auto& t : history) {
            cout << left << setw(12) << t.type
                 << right << setw(10) << t.amount
                 << right << setw(12) << t.balance_after << "
";
        }
    }

    double getBalance() const { return balance; }
    const string& getOwner() const { return owner; }
};

int main() {
    Account acc("ACC001", "Alice", 1000.0);

    try {
        acc.deposit(500);
        acc.withdraw(200);
        acc.deposit(1000);
        acc.withdraw(750);
        acc.withdraw(5000);  // this will throw
    } catch (const runtime_error& e) {
        cout << "Transaction failed: " << e.what() << "
";
    }

    acc.printStatement();
    return 0;
}

g++ -std=c++17 -o bank bank.cpp
./bank