public void CustomFunction()
{
var compiler = new EquationCompiler("factorial(5)");
compiler.AddFunction("factorial", x =>
{
int factorial = 1;
for (int i = 1; i <= x; i++)
{
factorial *= i;
}
return(factorial);
});
Assert.AreEqual(5 * 4 * 3 * 2 * 1, compiler.Calculate());
}