public JsonResult ConvertChange(decimal number)
{
string error = "";
moneyChangeController = new MoneyChangeController();
moneyChangeList = moneyChangeController.GetMoneyChangeFromDataBase(number);
if (moneyChangeController.Error != null && moneyChangeList.Count <= 0)
{
//There is an error with the sql, try no connection
error = moneyChangeController.Error;
moneyChangeList = moneyChangeController.GetMoneyChange(number);
}
return(Json(moneyChangeList, JsonRequestBehavior.AllowGet));
}
public void GetMoneyChange()
{
decimal number = Convert.ToDecimal(36.7);//834.35
Debug.WriteLine("Number: " + number);
decimal total = 0;
MoneyChangeController moneyChangeController = new MoneyChangeController();
List <MoneyChange> moneyChangeList = moneyChangeController.GetMoneyChange(number);
for (int i = 0; i < moneyChangeList.Count; i++)
{
//if is the last one just add it
if (i == moneyChangeList.Count - 1)
{
total += moneyChangeList[i].CurrencyValue * moneyChangeList[i].Quantity;
}
else
{
//make sure the next coin or bill is lower than the current one
if ((moneyChangeList[i + 1].Quantity <= moneyChangeList[i].Quantity) ||
(moneyChangeList[i + 1].Quantity * moneyChangeList[i + 1].CurrencyValue < moneyChangeList[i].CurrencyValue))
{
// if it is lower sum up to toal
total += moneyChangeList[i].CurrencyValue * moneyChangeList[i].Quantity;
}
//if it is not lower it wont add it to the total and it means we are not making sure that the highest values of coins and bills are used first
else
{
Assert.Fail("The algorithm is not making sure to use always the higher value coins and bills. ");
}
}
Debug.WriteLine("Currency Value: " + moneyChangeList[i].CurrencyValue + " Quantity: " + moneyChangeList[i].Quantity + " Total: " + total);
}
//if the total isn't the same as the original number it means there was one quantity of currency bigger hence the test fails
Assert.IsTrue(total == number);
}