/// <summary>
/// Finds the 2 most profitable days to trade on by comparing the highest and lowest stock prices for the month.
/// </summary>
/// <param name="monthlyStocks"></param>
/// <returns>The two best trading days to buy and sell on.</returns>
public static MostProfitableStocks FindMostProfitableStocks(List <Stock> monthlyStocks)
{
double largestStockPriceDifference = 0;
MostProfitableStocks mostProfitableMonthlyStocks = null;
foreach (Stock stockToBuy in monthlyStocks)
{
foreach (Stock stockToSell in monthlyStocks.Where(x => x.Day > stockToBuy.Day))
{
double stockPriceDifference = stockToSell.Price - stockToBuy.Price;
if (mostProfitableMonthlyStocks == null || stockPriceDifference >= largestStockPriceDifference)
{
largestStockPriceDifference = stockPriceDifference;
mostProfitableMonthlyStocks = new MostProfitableStocks {
StockToBuy = stockToBuy, StockToSell = stockToSell
};
}
}
}
return(mostProfitableMonthlyStocks);
}
/// <summary>
/// Outputs the 2 most profitable stocks of the month to buy and sell to the user
/// </summary>
/// <param name="mostProfitableStocks"></param>
public static void OutputStocks(MostProfitableStocks mostProfitableStocks)
{
Console.WriteLine($"{mostProfitableStocks.StockToBuy.Day}({mostProfitableStocks.StockToBuy.Price}), {mostProfitableStocks.StockToSell.Day}({mostProfitableStocks.StockToSell.Price})");
Console.WriteLine("Press any key to exit...");
Console.ReadLine();
}
public void FindBestDaysToTradeOn_NoStocks()
{
// Arrange
List <Stock> stocks = new List <Stock>();
// Act
MostProfitableStocks mostProfitableStocks = ProfitableStockFinder.FindMostProfitableStocks(stocks);
// Assert
mostProfitableStocks.Should().BeNull();
}
/// <summary>
/// Main
/// </summary>
/// <param name="args">The arguments.</param>
public static void Main(string[] args)
{
string[] stockPricesInput = File.ReadAllText(@"L:\StockPriceInputFiles\ChallengeSampleDataSet1.txt").Split(',');
List <Stock> monthlyStocks = StockBuilder.BuildStocks(stockPricesInput);
MostProfitableStocks mostProfitableMonthlystocks = ProfitableStockFinder.FindMostProfitableStocks(monthlyStocks);
if (mostProfitableMonthlystocks != null)
{
OutputMostProfitableStocks.OutputStocks(mostProfitableMonthlystocks);
}
else
{
Console.WriteLine("No stock prices found in file. Please ensure the input file contains comma seperated decimals only.");
Console.WriteLine("Press any key to exit...");
Console.ReadLine();
}
}
public void FindBestDaysToTradeOn_NoDifferenceInMonthlystockPrice()
{
// Arrange
List <Stock> stocks = new List <Stock>
{
new Stock
{
Day = 1,
Price = 1.00
},
new Stock
{
Day = 2,
Price = 1.00
},
new Stock
{
Day = 3,
Price = 1.00
},
new Stock
{
Day = 4,
Price = 1.00
},
new Stock
{
Day = 5,
Price = 1.00
},
};
// Act
MostProfitableStocks mostProfitableStocks = ProfitableStockFinder.FindMostProfitableStocks(stocks);
// Assert
mostProfitableStocks.StockToBuy.Day.Should().Be(stocks[3].Day);
mostProfitableStocks.StockToSell.Day.Should().Be(stocks[4].Day);
}
public void FindBestDaysToTradeOn_Valid()
{
// Arrange
List <Stock> stocks = new List <Stock>
{
new Stock
{
Day = 1,
Price = 1.00
},
new Stock
{
Day = 2,
Price = 2.00
}
};
// Act
MostProfitableStocks mostProfitableStocks = ProfitableStockFinder.FindMostProfitableStocks(stocks);
// Assert
mostProfitableStocks.StockToBuy.Should().BeEquivalentTo(stocks.First());
mostProfitableStocks.StockToSell.Should().BeEquivalentTo(stocks.Last());
}
