public interface IBankAccount // Can only add public Modifier , Or nothing
{
void Playin(decimal money); // Function without any embellishment
bool WithDrew(decimal money);
decimal Account
{
get;
}

}
class aa:IBankAccount
{
private decimal banance;

public void Playin(decimal money)// We have to add only public Modifier
{
banance+=money;
}

public bool WithDrew(decimal money)
{
if (banance >= money)
{
banance -= money;
return true;
}
else return false;
}
public decimal Account
{
get
{
return banance;
}
}
public override string ToString()// Within the system tostring Is a virtual base class , Can be rewritten
{
return String.Format("{0,6:c}",banance);
}

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