public void Solve_2()
{
void Test(double c)
{
var actual = target2(c);
var det = -c;
Assert.AreEqual(det < 0 ? 0 : det == 0 ? 1 : 2, actual.Length);
var f = QuadraticEquation1.CreateFunction(c);
foreach (var x in actual)
{
Assert2.AreNearlyEqual(0, f(x));
}
}
for (int c = -1000; c <= 1000; c++)
{
Test(c);
}
for (int c1 = 1; c1 <= 100; c1++)
{
for (double c2 = -100; c2 <= 100; c2++)
{
Test(c2 / c1);
}
}
}
public void Solve_1()
{
void Test(double a, double b, double c)
{
var actual = target1(a, b, c);
var det = b * b - 4 * a * c;
// Errors can be occurred.
Assert.AreEqual(det < 0 ? 0 : det == 0 ? 1 : 2, actual.Length);
var f = QuadraticEquation1.CreateFunction(a, b, c);
foreach (var x in actual)
{
Assert2.AreNearlyEqual(0, f(x), -9);
}
}
// A case with error for c - b * b / 4.
Test(100, 80, 16);
for (int a = -50; a <= 50; a++)
{
if (a != 0)
{
for (int b = -50; b <= 50; b++)
{
for (int c = -50; c <= 50; c++)
{
Test(a, b, c);
}
}
}
}
}