// attempt to remove an amount of money from the coin box
public Boolean Withdraw(decimal AmountToRemove)
{
decimal amountRemoved = 0M;
decimal amountLeftToRemove = AmountToRemove;
if ((AmountToRemove % Coin.ValueOfCoin(Coin.Denomination.NICKEL)) != 0)
{
Console.WriteLine("non multiple of 5");
return(false);
}
if (!ContainsExactChangeFor(AmountToRemove))
{
Console.WriteLine("Exact change requirement not met ValueOf={0:c}, AmountToRemove={1:c}",
this.ValueOf, AmountToRemove);
return(false);
}
foreach (Coin.Denomination denominationEnumeral in reversedCoinList)
{
decimal amountOfThisCoinRemoved = 0M;
if (amountLeftToRemove >= Coin.ValueOfCoin(denominationEnumeral))
{
amountOfThisCoinRemoved = removeCoinDenomiation(
amountLeftToRemove, denominationEnumeral);
amountLeftToRemove -= amountOfThisCoinRemoved;
amountRemoved += amountOfThisCoinRemoved;
}
}
Console.WriteLine("AmountRemoved {0}, AmountToRemove {1}", amountRemoved, AmountToRemove);
return(amountRemoved == AmountToRemove);
}
private bool ContainsExactChangeFor(decimal Amount)
{
Boolean result = false;
decimal amountToCheckFor = Amount;
if (amountToCheckFor < 0M)
{
result = false;
}
else if (amountToCheckFor == 0M)
{
result = true;
}
else
{
foreach (Coin.Denomination denominationEnumeral in reversedCoinList)
{
for (int i = 0; i < coinCount(denominationEnumeral); i++)
{
if (amountToCheckFor >= Coin.ValueOfCoin(denominationEnumeral))
{
amountToCheckFor -= Coin.ValueOfCoin(denominationEnumeral);
}
else
{
break;
}
}
result = amountToCheckFor == 0M;
}
}
return(result);
}
// remove as many of a specified coin as possible, without going over
private decimal removeCoinDenomiation(decimal AmountToRemove, Coin.Denomination denominationEnumeral)
{
var coins =
from aCoin in box
where aCoin.DenominationEnumeral == denominationEnumeral
select aCoin;
var coinArray = coins.ToArray();
decimal amountRemoved = 0M;
decimal amountLeftToRemove = AmountToRemove;
foreach (Coin aCoin in coinArray)
{
if (amountLeftToRemove >= Coin.ValueOfCoin(denominationEnumeral))
{
box.Remove(aCoin);
amountRemoved += aCoin.ValueOf;
amountLeftToRemove -= aCoin.ValueOf;
}
else
{
break;
}
}
return(amountRemoved);
}
