C++ Example 1

#include <iostream>
#include <vector>
#include <string>

// Kaizer here. I created a banking system, which allows you to create your own account, withdraw money, input account numbers, initial balance, and so on and so forth.

// class to represent a bank account
class Account {
private:
    std::string accountNumber;
    std::string accountHolder;
    double balance;

public:
    // constructor for initializing account details
    Account(const std::string &accNumber, const std::string &accHolder, double initialBalance)
            : accountNumber(accNumber), accountHolder(accHolder), balance(initialBalance) {}

    // function to find an already existing account number
    std::string getAccountNumber() const {
        return accountNumber;
    }

    // function to deposit money into the account
    void deposit(double amount) {
        if (amount > 0) {
            balance += amount;
            std::cout << "Deposited: " << amount << "\n";
        } else {
            std::cout << "Invalid deposit amount.\n";
        }
    }

    // function to withdraw money from the account
    void withdraw(double amount) {
        if (amount > 0 && amount <= balance) {
            balance -= amount;
            std::cout << "Withdrew: " << amount << "\n";
        } else {
            std::cout << "Invalid withdrawal amount or insufficient funds.\n";
        }
    }

    // function to check the account balance
    double getBalance() const {
        return balance;
    }

    // function to display account details
    void display() const {
        std::cout << "Account Number: " << accountNumber << "\n";
        std::cout << "Account Holder: " << accountHolder << "\n";
        std::cout << "Balance: " << balance << "\n";
    }
};

// public Class to manage multiple accounts
class Bank {
private:
    std::vector<Account> accounts;

public:
    // function to create a new account
    void createAccount(const std::string &accNumber, const std::string &accHolder, double initialBalance) {
        accounts.emplace_back(accNumber, accHolder, initialBalance);
        std::cout << "Account created successfully.\n";
    }

    // function to find an account by account number
    Account* findAccount(const std::string &accNumber) {
        for (auto &account : accounts) {
            if (account.getAccountNumber() == accNumber) {
                return &account;
            }
        }
        return nullptr;
    }

    // function to display all accounts
    void displayAllAccounts() const {
        for (const auto &account : accounts) {
            account.display();
            std::cout << "-------------------\n";
        }
    }
};

int main() {
    Bank bank;
    int choice;
    std::string accNumber, accHolder;
    double amount;

    do {
        std::cout << "1. Create Account\n";
        std::cout << "2. Deposit\n";
        std::cout << "3. Withdraw\n";
        std::cout << "4. Check Balance\n";
        std::cout << "5. Display All Accounts\n";
        std::cout << "6. Exit\n";
        std::cout << "Enter your choice: ";
        std::cin >> choice;

        switch (choice) {
            case 1:
                std::cout << "Enter account number: ";
                std::cin >> accNumber;
                std::cout << "Enter account holder name: ";
                std::cin >> accHolder;
                std::cout << "Enter initial balance: ";
                std::cin >> amount;
                bank.createAccount(accNumber, accHolder, amount);
                break;
            case 2:
                std::cout << "Enter account number: ";
                std::cin >> accNumber;
                if (Account* account = bank.findAccount(accNumber)) {
                    std::cout << "Enter amount to deposit: ";
                    std::cin >> amount;
                    account->deposit(amount);
                } else {
                    std::cout << "Account not found.\n";
                }
                break;
            case 3:
                std::cout << "Enter account number: ";
                std::cin >> accNumber;
                if (Account* account = bank.findAccount(accNumber)) {
                    std::cout << "Enter amount to withdraw: ";
                    std::cin >> amount;
                    account->withdraw(amount);
                } else {
                    std::cout << "Account not found.\n";
                }
                break;
            case 4:
                std::cout << "Enter account number: ";
                std::cin >> accNumber;
                if (Account* account = bank.findAccount(accNumber)) {
                    std::cout << "Balance: " << account->getBalance() << "\n";
                } else {
                    std::cout << "Account not found.\n";
                }
                break;
            case 5:
                bank.displayAllAccounts();
                break;
            case 6:
                std::cout << "Exiting...\n";
                break;
            default:
                std::cout << "Invalid choice. Please try again.\n";
        }
    } while (choice != 6);

    return 0;
}