public void TestTwistyMathCalculations()
{
//Test code path when customer owes money
Change owedMoney = new Change();
owedMoney.AmountOwed = 532;
owedMoney.MoneyOwed = true;
TwistyMath TwistOwed = new TwistyMath();
Change owedMoneyTestResult = TwistOwed.CalculateChange((decimal)7.25, (decimal)12.57);
Assert.AreEqual(owedMoney.MoneyOwed, owedMoneyTestResult.MoneyOwed);
Assert.AreEqual(owedMoney.AmountOwed, owedMoneyTestResult.AmountOwed);
Assert.AreEqual(owedMoney.Dollars, owedMoneyTestResult.Dollars);
//Test code path when change is due and the amount owed is not divisible by 3
Change StandardChange = new Change();
StandardChange.Dollars = 1;
StandardChange.Quarters = 3;
StandardChange.Pennies = 3;
StandardChange.IsRandomChange = false;
StandardChange.ChangeOwed = 178;
TwistyMath TwistStandardChange = new TwistyMath();
Change StandardChangeTestResult = TwistStandardChange.CalculateChange((decimal)5.00, (decimal)3.22);
Assert.AreEqual(StandardChange.Dollars, StandardChangeTestResult.Dollars);
Assert.AreEqual(StandardChange.Quarters, StandardChangeTestResult.Quarters);
Assert.AreEqual(StandardChange.Dimes, StandardChangeTestResult.Dimes);
Assert.AreEqual(StandardChange.Nickels, StandardChangeTestResult.Nickels);
Assert.AreEqual(StandardChange.Pennies, StandardChangeTestResult.Pennies);
Assert.AreEqual(StandardChange.IsRandomChange, StandardChangeTestResult.IsRandomChange);
Assert.AreEqual(StandardChange.ChangeOwed, StandardChangeTestResult.ChangeOwed);
}
public void GetChange()
{
try
{
Change = new TwistyMath().CalculateChange(AmountPaid, AmountOwed);
}
catch(Exception ex)
{
Console.WriteLine("An error has occured calculating the changed owed to the customer. Error details: " + ex.Message + " ----- " + ex.StackTrace);
}
}
public Change CalculateChange(decimal AmountPaid, decimal AmountOwed)
{
Change _change = new Change();
int _calculatedChange = 0;
int _amountPaidHundreds = 0;
int _amountOwedHundreds = 0;
List<int> Denominations = new List<int>();
Denominations.Add(100);
Denominations.Add(25);
Denominations.Add(10);
Denominations.Add(5);
Denominations.Add(1);
try
{
_amountPaidHundreds = (int)(AmountPaid * 100);
_amountOwedHundreds = (int)(AmountOwed * 100);
_calculatedChange = _amountPaidHundreds - _amountOwedHundreds;
if (_calculatedChange < 0)
{
//If the customer has not provided enough money to cover thier bill tell the cashier that they owe more money.
_change.MoneyOwed = true;
_change.AmountOwed = _calculatedChange * -1;
}
else
{
_change.ChangeOwed = _calculatedChange;
if (_calculatedChange % 3 == 0)
{
_change.IsRandomChange = true;
//Twisty Math -- If the "owed" amount is divisible by 3, the app should randomly generate the change denominations
Random rand = new Random();
while (_calculatedChange > 0)
{
var randInt = Denominations[rand.Next(0, Denominations.Count)];
if (randInt <= _calculatedChange)
{
switch (randInt)
{
case 100:
_change.Dollars = _change.Dollars + (int)(_calculatedChange / _dollar);
_calculatedChange = _calculatedChange - ((int)(_calculatedChange / _dollar) * _dollar);
break;
case 25:
_change.Quarters = _change.Quarters + (int)(_calculatedChange / _quarter);
_calculatedChange = _calculatedChange - ((int)(_calculatedChange / _quarter) * _quarter);
break;
case 10:
_change.Dimes = _change.Dimes + (int)(_calculatedChange / _dime);
_calculatedChange = _calculatedChange - ((int)(_calculatedChange / _dime) * _dime);
break;
case 5:
_change.Nickels = _change.Nickels + (int)(_calculatedChange / _nickel);
_calculatedChange = _calculatedChange - ((int)(_calculatedChange / _nickel) * _nickel);
break;
case 1:
_change.Pennies = _change.Pennies + (int)(_calculatedChange / _penny);
_calculatedChange = _calculatedChange - ((int)(_calculatedChange / _penny) * _penny);
break;
}
}
}
}
else
{
//The function of the application is to tell the cashier how much change is owed, and what denominations should be used.
//In most cases the app should return the minimum amount of physical change.
_change.Dollars = (int)(_calculatedChange / _dollar);
_change.Quarters = (int)((_calculatedChange % _dollar) / _quarter);
_change.Dimes = (int)(((_calculatedChange % _dollar) % _quarter) / _dime);
_change.Nickels = (int)((((_calculatedChange % _dollar) % _quarter) % _dime) / _nickel);
_change.Pennies = (int)(((((_calculatedChange % _dollar) % _quarter) % _dime) % _nickel) / _penny);
}
}
}
catch (Exception ex)
{
throw ex;
}
return _change;
}
private static void ProcessFile(string file)
{
List <string> lines = HandleFile(file);
List <string> writeOut = new List <string>();
int t = lines.Count;
int count = 0;
l.Output(String.Format("Lines in file:{0}", t));
foreach (string m in lines)
{
if (m.Contains(","))
{
string[] arr = m.Split(',');
if (arr.Length == 2 && !string.IsNullOrWhiteSpace(arr[0]) && !string.IsNullOrWhiteSpace(arr[1]))
{
decimal ttl, given;
decimal.TryParse(arr[0], out ttl);
decimal.TryParse(arr[1], out given);
if (given > ttl)
{
decimal chng = given - ttl;
decimal dollars = Math.Truncate(chng);
chng = chng - dollars;
decimal outofCoin = 0.5m;
if ((ttl * 100) % 3 == 0)
{
// always between 1, 2, or 3
int rnd = _r.Next(1, 4);
if (rnd == 3)
{
rnd = 5;
}
outofCoin = 0.05m * rnd;
}
string fmt = Change.GetListOfChange(chng, outofCoin);
writeOut.Add(string.Format("{0} {1}", (dollars > 0 ? (dollars + " dollar" + (dollars == 1 ? "" : "s")) : ""), fmt));
}
else
{
decimal chng = ttl - given;
if (chng == 0)
{
writeOut.Add("No change needed");
}
else
{
writeOut.Add(string.Format("Still need {0}", chng));
}
}
}
else
{
throw new Exception(string.Format("Format not correct in file {1} at line {0}", count, file));
}
}
else
{
throw new Exception(string.Format("Expected comma in file {1} at line {0}", count, file));
}
}
if (writeOut.Count > 0)
{
// try catch in preceding method
// output results to new file in same folder ending with _cmpl
string newfilename = file.Substring(0, file.Length - 4) + "_cmpl.txt";
string curfilepath = Path.GetDirectoryName(file) + "\\";
if (!Directory.Exists(outPutFolderPath))
{
Directory.CreateDirectory(outPutFolderPath);
}
newfilename = newfilename.Replace(curfilepath, outPutFolderPath);
File.WriteAllLines(newfilename, writeOut);
}
}
