static void Main(string[] args)
{
var parameters = new CreditParameters
{
CreditValue = 196879.95d,
InstallmentsCount = 48,
InstallmentsPerYear = 12,
WiborRate = 0.0164d,
Start = 0.075d,
End = 0.080d,
Delta = 0.0005d
};
var tasks = new List<Task>();
for (var i = parameters.Start; i <= parameters.End; i += parameters.Delta)
{
var margin = i;
tasks.Add(Task.Factory.StartNew(() =>
{
CalculateInstallmentValue(parameters, margin);
}));
}
Task.WaitAll(tasks.ToArray());
Console.WriteLine("Press any key to continue...");
Console.ReadKey(true);
}
static void CalculateInstallmentValue(CreditParameters parameters, double m)
{
//Console.WriteLine(String.Format("Margin: {0:F4}", margin));
var q = 1.0d + (parameters.WiborRate + m) / parameters.InstallmentsPerYear;
var w1 = Math.Pow(q, parameters.InstallmentsCount);
var w2 = Math.Pow(q, parameters.InstallmentsCount) - 1.0d;
var r = parameters.CreditValue * w1 * (q - 1) / w2;
Console.WriteLine(String.Format("m:{0,-10:F6}q:{1,-10:F6}r:{2,-10:F6}", m, q, r));
}
public static CreditResult DoCalculation(CreditParameters creditParameters)
{
var q = 1.0d + creditParameters.TotalLoanRate / (double)creditParameters.InstallmentsPerYear;
var qPowN = Math.Pow(q, creditParameters.InstallmentsCount);
var singleRate = creditParameters.CreditValue * qPowN * (q - 1) / (qPowN - 1);
return new CreditResult
{
InstallmentValue = singleRate,
TotalCredit = creditParameters.InstallmentsCount * singleRate,
};
}
public static void DoSimulationWithFixedInstallmentValue(CreditParameters creditParameters, Action<int, double, double, double, double, double> displayAction)
{
var multiplier = creditParameters.LoanRate / creditParameters.InstallmentsPerYear;
var remainingCapital = creditParameters.CreditValue;
var installmentValue = creditParameters.InstallmentValue;
var counter = 0;
do
{
var interest = multiplier * remainingCapital;
var capitalPart = installmentValue - interest;
displayAction(++counter, installmentValue, interest, capitalPart, remainingCapital, remainingCapital -= capitalPart);
}
while (installmentValue <= remainingCapital);
displayAction(++counter, remainingCapital, 0.0d, 0.0d, remainingCapital, 0.0d);
}
//static void Main(string[] args)
//{
// ConsoleKeyInfo key;
// do
// {
// try
// {
// string line = string.Empty;
// Console.Write("Credit value: ");
// var creditParameters = new CreditParameters
// {
// CreditValue = Double.Parse(Console.ReadLine()),
// };
// Console.Write("Total installments: ");
// creditParameters.InstallmentsCount = Int32.Parse(Console.ReadLine());
// Console.Write("Installments per year: ");
// creditParameters.InstallmentsPerYear = Int32.Parse(Console.ReadLine());
// Console.Write("Loan rate (e.g. 5% = 0.05):");
// creditParameters.LoanRate = Double.Parse(Console.ReadLine());
// var res = KLSystems.Finances.Commons.CreditCalculator.DoCalculation(creditParameters);
// Console.WriteLine(String.Format("Installment value: {0:F4}", res.InstallmentValue));
// Console.WriteLine(String.Format("Total credit value: {0:F4}", res.TotalCredit));
// }
// catch(Exception excep)
// {
// Console.WriteLine(excep.Message);
// }
// Console.WriteLine("Do you want to continue ? ('Y' or 'y')");
// key = Console.ReadKey();
// }
// while (Char.ToUpper(key.KeyChar) == 'Y');
//}
static void Main(string[] args)
{
ConsoleKeyInfo key;
do
{
try
{
string line = string.Empty;
Console.Write("Credit value: ");
var creditParameters = new CreditParameters
{
CreditValue = Double.Parse(Console.ReadLine()),
};
Console.Write("Installments per year: ");
creditParameters.InstallmentsPerYear = Int32.Parse(Console.ReadLine());
Console.Write("Loan rate (e.g. 5% = 0.05): ");
creditParameters.LoanRate = Double.Parse(Console.ReadLine());
Console.Write("Fixed installment value: ");
creditParameters.InstallmentValue = Double.Parse(Console.ReadLine());
Commons.CreditCalculator.DoSimulationWithFixedInstallmentValue(creditParameters, DisplaySimulationRow);
}
catch (Exception excep)
{
Console.WriteLine(excep.Message);
}
Console.WriteLine("Do you want to continue ? ('Y' or 'y')");
key = Console.ReadKey();
}
while (Char.ToUpper(key.KeyChar) == 'Y');
}
