Private balance with public Deposit method.
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using System;
class Program
{
static void Main()
{
var w = new Wallet();
w.Deposit(50);
Console.WriteLine(w.GetBalance());
class Wallet {
private decimal _balance;
public void Deposit(decimal amt) => _balance += amt;
public decimal GetBalance() => _balance;
}
}
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Encapsulation hides fields; expose controlled methods.
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