Why encapsulation matters in C Sharp (C#) - See It in Action

Why encapsulation matters

📖 Scenario: Imagine you are building a simple bank account system. You want to keep the account balance safe so no one can change it directly by mistake. This is where encapsulation helps.

🎯 Goal: You will create a BankAccount class that keeps the balance private. You will add methods to safely deposit and withdraw money. Finally, you will show the balance using a method.

📋 What You'll Learn

Create a class called BankAccount with a private field balance of type decimal

Add a public method Deposit that adds money to balance

Add a public method Withdraw that subtracts money from balance only if there is enough money

Add a public method GetBalance that returns the current balance

Create an instance of BankAccount and use the methods to deposit, withdraw, and print the balance

💡 Why This Matters

🌍 Real World

Encapsulation is used in real bank software to protect account balances and prevent errors or fraud.

💼 Career

Understanding encapsulation is essential for writing safe and maintainable code in any software development job.

1

Create the BankAccount class with a private balance

Create a class called BankAccount with a private field balance of type decimal and set it to 0.

C Sharp (C#)

class BankAccount
{
    // Your code here
}

Need a hint?

Use private decimal balance = 0m; inside the class.

2

Add Deposit and Withdraw methods

Add a public method Deposit that takes a decimal amount and adds it to balance. Add a public method Withdraw that takes a decimal amount and subtracts it from balance only if balance is greater or equal to amount.

C Sharp (C#)

class BankAccount
{
    private decimal balance = 0m;

    // Your code here
}

Need a hint?

Use public void Deposit(decimal amount) and public void Withdraw(decimal amount) methods with the described logic.

3

Add GetBalance method

Add a public method GetBalance that returns the current balance as decimal.

C Sharp (C#)

class BankAccount
{
    private decimal balance = 0m;

    public void Deposit(decimal amount)
    {
        balance += amount;
    }

    public void Withdraw(decimal amount)
    {
        if (balance >= amount)
        {
            balance -= amount;
        }
    }

    // Your code here
}

Need a hint?

Use public decimal GetBalance() method that returns balance.

4

Create BankAccount instance and use methods

Create an instance of BankAccount called account. Deposit 100.50, withdraw 20.25, then print the balance using Console.WriteLine and account.GetBalance().

C Sharp (C#)

class BankAccount
{
    private decimal balance = 0m;

    public void Deposit(decimal amount)
    {
        balance += amount;
    }

    public void Withdraw(decimal amount)
    {
        if (balance >= amount)
        {
            balance -= amount;
        }
    }

    public decimal GetBalance()
    {
        return balance;
    }
}

// Your code here

Need a hint?

Create BankAccount account = new BankAccount();, then call Deposit(100.50m), Withdraw(20.25m), and print balance with Console.WriteLine(account.GetBalance());.