Banking System Simulator (C# Console)

C# console-based banking system that demonstrates Object-Oriented Programming (OOP) through Accounts, Transactions (Deposit, Withdraw, Transfer), and rollback aspects.

Features

• Create and store accounts in-memory
• Deposit and Withdraw with validation
• Transfer between accounts (withdraw + deposit)
• Transaction state tracking: Executed, Success, Reversed
• Rollback support for transactions
• Interactive console menu (text UI)

OOP concepts

• Encapsulation
  • Account state (Name, Balance) is private and modified only via methods deposit() and withdraw().
• Composition
  • TranserTransaction composes a WithdrawTransaction and DepositTransaction to perform an atomic transfer.
• Abstraction (interfaces suggested)
  • Each transaction exposes Execute(), RollBack(), and read-only flags.
  • Future improvement: Introduce a common ITransaction interface or abstract base class to unify transaction handling.
• Information Hiding & Invariants
  • Balance updates are only allowed via guarded methods that validate amounts and available funds.
• Error Handling as Part of Design
  • Transactions guard against double execution and invalid rollback attempts with clear exceptions and flags.

How to use

1. Clone the Repository

git clone https://github.com/nodogx/Banking-System-Simulator.git
cd Banking-System-Simulator

### 2. Build the Project
Make sure you have the .NET SDK installed (e.g., .NET 7 or .NET 8):
```bash
dotnet build

3. Run the Application

dotnet run

4. Use the Menu Interface

You’ll see:

1. Withdraw
2. Deposit
3. Print Account
4. Transfer
5. Add Account
6. Quit

Enter the number for your action.

5. Example Session

• Add an account

  Select option: 5
  Enter account name: Alice
  Enter starting balance: 100
  

• Deposit funds

  Select option: 2
  Enter account name: Alice
  Enter amount to deposit: 50
  

• Withdraw funds

  Select option: 1
  Enter account name: Alice
  Enter amount to withdraw: 30
  

• Transfer funds

  Select option: 4
  Enter source account name: Alice
  Enter destination account name: Bob
  Enter amount to transfer: 20
  

• Print balance

  Select option: 3
  Enter account name: Alice
  

• Exit

  Select option: 6