/// <summary>
/// Calculate the potential profit margin.
/// </summary>
/// <param name="costInput">Cost in dollars and cents (from user input as string)</param>
/// <param name="priceInput">Desired percent profit margin, no decimal places (from user input as string)</param>
/// <returns>Suggested product price</returns>
public static decimal CalculateMargin(string costInput, string priceInput)
{
//if (string.IsNullOrWhiteSpace(costInput)) throw new ArgumentException("Please enter the cost");
//if (string.IsNullOrWhiteSpace(priceInput)) throw new ArgumentException("Please enter the price");
// decimal cost = decimal.Parse(costInput);
// decimal price = decimal.Parse(priceInput);
decimal cost = 0;
var success = decimal.TryParse(costInput, out cost);
if (!success || cost < 0)
{
throw new ArgumentException("The cost must be a number 0 or greater");
}
decimal price = 0;
success = decimal.TryParse(priceInput, out price);
if (!success || price <= 0)
{
throw new ArgumentException("The price must be a number greater than 0");
}
// Build an object with the validated values
var pricingInput = new PricingInput(cost, price);
//var x = CalculateMargin(null);
return(CalculateMargin(pricingInput));
}
internal static decimal CalculateMargin(PricingInput priceInput)
{
if (priceInput == null)
{
throw new NullReferenceException("Pricing information cannot be null");
}
//if (priceInput.Price <= 0) throw new ArgumentException("Price must be greater than 0");
var margin = ((priceInput.Price - priceInput.Cost) / priceInput.Price) * 100M;
return(Math.Round(margin, 2));
}
