public static void IncreaseRates(LoanPortfolio portfolio)
{
Console.Write("Rate increase (%): ");
decimal rateIncrease = decimal.Parse(Console.ReadLine());
portfolio.PortfolioAction((l) => l.Rate += (rateIncrease / 100));
}
private static void QueryLoansByRate(LoanPortfolio portfolio)
{
Console.Write("Enter the rate: ");
decimal rate = decimal.Parse(Console.ReadLine());
rate = (rate / 100);
Console.Write("Enter comparison: (< or >): ");
string comparer = Console.ReadLine();
if (comparer == "<")
{
Console.WriteLine();
Console.WriteLine($"Loans with rates < then {rate.ToString("p")}");
foreach (var loan in portfolio.FindLoans((l) => l.Rate < rate))
{
Console.WriteLine(loan);
}
Console.WriteLine();
Console.WriteLine();
}
else
{
Console.WriteLine();
Console.WriteLine($"Loans with rates > then {rate.ToString("p")}");
foreach (var loan in portfolio.FindLoans((l) => l.Rate > rate))
{
Console.WriteLine(loan);
}
Console.WriteLine();
Console.WriteLine();
}
}
private static void QueryLoansByBalance(LoanPortfolio portfolio)
{
Console.Write("Enter the balance: ");
decimal balance = decimal.Parse(Console.ReadLine());
Console.Write("Enter comparison: (< or >): ");
string comparer = Console.ReadLine();
if (comparer == "<")
{
Console.WriteLine();
Console.WriteLine($"Loans with balance < then {balance.ToString("c")}");
foreach (var loan in portfolio.FindLoans((l) => l.Balance < balance))
{
Console.WriteLine(loan);
}
Console.WriteLine();
Console.WriteLine();
}
else
{
Console.WriteLine();
Console.WriteLine($"Loans with balance > then {balance.ToString("c")}");
foreach (var loan in portfolio.FindLoans((l) => l.Balance > balance))
{
Console.WriteLine(loan);
}
Console.WriteLine();
Console.WriteLine();
}
}
public static void DisplayLoans(LoanPortfolio portfolio)
{
foreach (Loan item in portfolio.Loans)
{
Console.WriteLine(item);
}
Console.WriteLine();
}
public static void PayoffAllLoans(LoanPortfolio portfolio)
{
Console.Write("This action will payoff all loans are you sure? ");
string ans = Console.ReadLine();
if (ans.ToLower() == "y")
{
portfolio.PortfolioAction((l) => l.MakePayment(l.Balance));
}
}
private static void PrePopulateLoans(LoanPortfolio portfolio)
{
Random rand = new Random(DateTime.Now.Second);
int numLoans = rand.Next(2, 5);
for (int i = 0; i < numLoans; i++)
{
int loanNum = _nextLoanNumber++;
decimal balance = (decimal)(rand.NextDouble() * 10000);
decimal paymentAmount = balance / (20 * 12);
decimal rate = (decimal)(rand.NextDouble() % .2);
portfolio.AddLoan(new Loan()
{
Balance = balance, LoanNumber = loanNum, PaymentAmount = paymentAmount, Rate = rate
});
}
}
public static void AddLoan(LoanPortfolio portfolio)
{
Console.Write("Loan Balance: ");
decimal balance = decimal.Parse(Console.ReadLine());
Console.Write("Monthly Payment: ");
decimal payment = decimal.Parse(Console.ReadLine());
Console.Write("Interest Rate: ");
decimal rate = decimal.Parse(Console.ReadLine());
Console.WriteLine("");
portfolio.AddLoan(new Loan()
{
Balance = balance, Rate = rate / 100, LoanNumber = _nextLoanNumber++, PaymentAmount = payment
});
}
public static void MakePayment(LoanPortfolio portfolio)
{
Console.Write("Enter Loan number: ");
int loanNum = int.Parse(Console.ReadLine());
Loan loan = portfolio.FindLoans((l) => l.LoanNumber == loanNum).FirstOrDefault();
if (loan != null)
{
Console.WriteLine("Details for loan:");
Console.WriteLine(loan);
Console.WriteLine();
Console.Write("Payment amount: ");
decimal paymentAmount = decimal.Parse(Console.ReadLine());
loan.MakePayment(paymentAmount);
}
else
{
Console.WriteLine("Loan not found.");
}
}
static void Main(string[] args)
{
// goals:
// 1. understand and use delegates as a function pointer
// 2. understand and implement a class that fires events and a class that handles the events
// 3. use Actions and Functions and lambdas
LoanPortfolio portfolio = new LoanPortfolio();
portfolio.Journal = JournalEvent;
PrePopulateLoans(portfolio);
Console.WriteLine("Welcome to the CSharp Loan Portfolio.");
Console.WriteLine("");
while (true)
{
Console.WriteLine("Select an option:");
Console.WriteLine("1. Add Loan");
Console.WriteLine("2. Make Payment");
Console.WriteLine("3. Increase Rates on Portfolio");
Console.WriteLine("4. Payoff all loans!");
Console.WriteLine("5. Display Loans");
Console.WriteLine("6. Display loans by balance");
Console.WriteLine("7. Display loans by rate");
Console.WriteLine("8. Display loans by query");
Console.WriteLine("9. Exit");
Console.WriteLine("");
Console.Write("Option: ");
string option = Console.ReadLine();
Console.WriteLine("");
switch (option)
{
case "1":
AddLoan(portfolio);
break;
case "2":
MakePayment(portfolio);
break;
case "3":
IncreaseRates(portfolio);
break;
case "4":
PayoffAllLoans(portfolio);
break;
case "5":
DisplayLoans(portfolio);
break;
case "6":
QueryLoansByBalance(portfolio);
break;
case "7":
QueryLoansByRate(portfolio);
break;
default:
Environment.Exit(0);
break;
}
}
}
