public List<Term> Derivate(Term[] equation)
{
var results = new List<Term>();
foreach (Term term in equation)
{
if (term.Exponent == 0)
{
continue;
}
var result = new Term();
result.Exponent = term.Exponent - 1;
result.Coeff = term.Exponent*term.Coeff;
results.Add(result);
}
return results;
}
static void Main()
{
// 3x^2 + 5x + 2
var term1 = new Term {Coeff = 3, Exponent = 2};
var term2 = new Term {Coeff = 5, Exponent = 1};
var term3 = new Term {Coeff = 2, Exponent = 0};
var equation = new[] { term1, term2, term3};
var calculator = new DerivativeCalculator();
List<Term> results = calculator.Derivate(equation);
foreach (Term term in results)
{
Console.Write("{0}x^{1}", term.Coeff, term.Exponent);
Console.Write(term.Coeff >= 0 ? " + ": " - ");
}
Console.WriteLine();
Console.WriteLine("Expected");
Console.WriteLine("6x^1 + 5x^0");
}