static void Main(string[] args)
{
Console.WriteLine("ax^2 + bx + c = 0");
Console.Write("Enter a: ");
var aString = Console.ReadLine();
double a = InputValidation.CheckValidity(aString);
Console.Write("Enter b: ");
var bString = Console.ReadLine();
double b = InputValidation.CheckValidity(bString);
Console.Write("Enter c: ");
var cString = Console.ReadLine();
double c = InputValidation.CheckValidity(cString);
var discriminant = SquareEquationMath.Discriminant(a, b, c);
Console.WriteLine($"Discriminant = {discriminant}");
if (discriminant == 0)
{
var firstRoot = SquareEquationMath.FirstRoot(discriminant, a, b);
Console.WriteLine("Equation has 1 root");
Console.WriteLine($"x1 = {firstRoot:F2}");
Console.WriteLine($"{a}x^2 + {b}x + {c} = {a}*(x - {firstRoot:F2})*(x - {firstRoot:F2})");
}
if (discriminant > 0)
{
var firstRoot = SquareEquationMath.FirstRoot(discriminant, a, b);
var secondRoot = SquareEquationMath.SecondRoot(discriminant, a, b);
Console.WriteLine("Equation has 2 roots");
Console.WriteLine($"x1 = {firstRoot:F2}");
Console.WriteLine($"x2 = {secondRoot:F2}");
Console.WriteLine($"{a}x^2 + {b}x + {c} = {a}*(x - {firstRoot:F2})*(x - {secondRoot:F2})");
}
if (discriminant < 0)
{
Console.WriteLine("Equation has no roots");
}
Console.ReadKey();
}
private void btnCalculate_Click(object sender, EventArgs e)
{
var stringA = txtA.Text;
var stringB = txtB.Text;
var stringC = txtC.Text;
double a;
if (double.TryParse(stringA, out a) == false)
{
MessageBox.Show("Supplied value 'a' is not a number, please try again");
}
double b;
if (double.TryParse(stringB, out b) == false)
{
MessageBox.Show("Supplied value 'b' is not a number, please try again");
}
double c;
if (double.TryParse(stringC, out c) == false)
{
MessageBox.Show("Supplied value 'c' is not a number, please try again");
}
var discriminant = SquareEquationMath.Discriminant(a, b, c);
if (discriminant < 0)
{
MessageBox.Show("D < 0, equation has no roots!");
}
var firstRoot = SquareEquationMath.FirstRoot(discriminant, a, b);
var secondRoot = SquareEquationMath.SecondRoot(discriminant, a, b);
lblDiscriminant.Text = discriminant.ToString();
lblFirstRoot.Text = firstRoot.ToString();
lblSecondRoot.Text = secondRoot.ToString();
lblPolyFactor.Text = $"{a}x² + {b}x + {c} = {a}*(x - {firstRoot:F2})*(x - {secondRoot:F2})";
}