static void Main(string[] args)
{
LoanTerms loanTerms = new LoanTerms();
while (loanTerms.Amount <= 0)
{
Console.WriteLine("amount:");
if (loanTerms.HasAmountFailed)
{
Console.WriteLine("Please type an integer above zero:");
}
var amount = Console.ReadLine();
loanTerms.SetAmount(amount);
}
while (loanTerms.Interest <= 0)
{
Console.WriteLine("interest:");
if (loanTerms.HasInterestFailed)
{
Console.WriteLine("Please type a percentage above zero:");
}
var interest = Console.ReadLine();
loanTerms.SetInterest(interest);
}
while (loanTerms.Downpayment <= 0)
{
Console.WriteLine("downpayment:");
if (loanTerms.HasDownpaymentFailed)
{
Console.WriteLine("Please type an integer above zero:");
}
var downpayment = Console.ReadLine();
loanTerms.SetDownpayment(downpayment);
}
while (loanTerms.Term <= 0)
{
Console.WriteLine("term:");
if (loanTerms.HasTermFailed)
{
Console.WriteLine("Please type an integer above zero:");
}
var term = Console.ReadLine();
loanTerms.SetTerm(term);
}
Console.WriteLine("");
LoanProcessor loanProcessor = new LoanProcessor();
loanProcessor.Calculate(loanTerms);
Console.WriteLine(JsonConvert.SerializeObject(loanProcessor.LoanValues));
Console.ReadKey();
}
public void Calculate(LoanTerms loanTerms)
{
double rate = (loanTerms.Interest / 12) * .01;
int numberOfPeriods = loanTerms.Term * 12;
int principal = loanTerms.Amount - loanTerms.Downpayment;
double amortizationNumerator = rate * Math.Pow((1 + rate), numberOfPeriods);
double amortizationDenominator = Math.Pow((1 + rate), numberOfPeriods) - 1;
decimal monthlyPayment = Convert.ToDecimal(principal * (amortizationNumerator / amortizationDenominator));
decimal totalPayment = (monthlyPayment * numberOfPeriods);
decimal totalInterest = totalPayment - principal;
_loanValues = new Dictionary <string, decimal>()
{
{ "monthly payment", decimal.Round(monthlyPayment, 2) }, { "total interest", decimal.Round(totalInterest, 2) }, { "total payment", decimal.Round(totalPayment, 2) }
};
}