static string Derivative(Calculus calculator)
{
string result;
try
{
Console.WriteLine();
Console.Write($"Calculating derivative of {calculator.GetPolynomial()} evaluated at what x? ");
}
catch (InvalidOperationException e)
{
return(e.Message);
}
if (double.TryParse(Console.ReadLine().Trim(), out double x))
{
try
{
result = $"result = {calculator.EvaluatePolynomialDerivative(x)}";
}
catch (InvalidOperationException e)
{
result = e.Message;
}
}
else
{
result = "Not a valid number";
}
return(result);
}
static string Integral(Calculus calculator)
{
string result;
try
{
Console.WriteLine();
Console.WriteLine($"Calculating integral of {calculator.GetPolynomial()} from a to b.");
}
catch (InvalidOperationException e)
{
return(e.Message);
}
Console.Write("What is a? ");
if (!double.TryParse(Console.ReadLine().Trim(), out double a))
{
result = "Not a valid number.";
}
else
{
Console.Write("What is b? ");
if (!double.TryParse(Console.ReadLine().Trim(), out double b))
{
result = "Not a valid number.";
}
else
{
try
{
result = $"result = {calculator.EvaluatePolynomialIntegral(a, b)}";
}
catch (InvalidOperationException e)
{
result = e.Message;
}
}
}
return(result);
}
static void Main()
{
Calculus calculator = new Calculus();
Console.WriteLine("Welcome to the calculator program! Select from the menu:");
while (true)
{
Console.WriteLine();
Console.Write("(a)rithmetic, (s)et polynomial, (g)et all roots, (p)rint polynomial, (d)ifferentiate, (i)ntegrate, (q)uit? ");
string choice;
try
{
choice = Console.ReadLine().Trim().ToLower();
}
catch (System.IO.IOException e)
{
Console.WriteLine($"IO Exception: {e.Message}");
continue;
}
string result = string.Empty;
const double accuracy = 0.000001; //For simplcity, accuracy is set to a constant.
if (choice.StartsWith("a"))
{
result = Arithmetic.BasicArithmetic();
}
else if (choice.StartsWith("d"))
{
result = Derivative(calculator);
}
else if (choice.StartsWith("i"))
{
result = Integral(calculator);
}
else if (choice.StartsWith("g"))
{
try
{
List <double> roots = calculator.GetAllRoots(accuracy);
if (roots.Count == 0)
{
result = "No real roots found.";
}
else
{
for (int i = 0; i < roots.Count; i++)
{
result += $"root{i} = {roots[i]}\n";
}
}
}
catch (InvalidOperationException e)
{
result = e.Message;
}
}
else if (choice.StartsWith("p"))
{
try
{
result = calculator.GetPolynomial();
}
catch (InvalidOperationException e)
{
result = e.Message;
}
}
else if (choice.StartsWith("q"))
{
break;
}
else if (choice.StartsWith("s"))
{
if (calculator.SetPolynomial())
{
result = $"Polynomial saved successfully: {calculator.GetPolynomial()}";
}
else
{
result = "Not a valid polynomial.";
}
}
else
{
result = "Please choose from the menu";
}
Console.WriteLine();
Console.WriteLine(result);
}
}