public void GivenInvalidMultiplesToDouble_ThrowsArgumentException()
{
var range = new Range { Min = 1, Max = 5 };
int[] multiplesToDouble = null;
Assert.Throws<ArgumentNullException>(() => SummingAlgorithm.SumWithDoubling(range, multiplesToDouble));
}
public void GivenInvalidRange_ThrowsArgumentException()
{
var range = new Range { Min = 1, Max = 0 };
var multiplesToDouble = new int[] { 3, 5 };
Assert.Throws<ArgumentException>(() => SummingAlgorithm.SumWithDoubling(range, multiplesToDouble));
}
public void GivenRange1To1000AndDoubles3And5_ReturnsTotalOf734668()
{
var range = new Range { Min = 1, Max = 1000 };
var multiplesToDouble = new int[] { 3, 5 };
var sum = SummingAlgorithm.SumWithDoubling(range, multiplesToDouble);
Assert.That(sum, Is.EqualTo(734668));
}
public void GivenRange1To5AndDoublesNone_ReturnsTotalOf15()
{
var range = new Range { Min = 1, Max = 5 };
var multiplesToDouble = new int[] {};
var sum = SummingAlgorithm.SumWithDoubling(range, multiplesToDouble);
Assert.That(sum, Is.EqualTo(15));
}
static void Main(string[] args)
{
var range = new Range { Min = 1, Max = 1000 };
var multiplesToDouble = new int[] { 3, 5 };
var sum = SummingAlgorithm.SumWithDoubling(range, multiplesToDouble);
Console.WriteLine("The solution is: " + sum);
Console.ReadKey();
}
public static int SumWithDoubling(Range range, int[] multiplesToDouble)
{
if (range == null)
throw new ArgumentNullException("range", "The range parameter should not be null.");
if (multiplesToDouble == null)
throw new ArgumentNullException("multiplesToDouble", "The multiplesToDouble parameter should not be null.");
if (range.Min > range.Max)
throw new ArgumentException("The minimum range should not be greater than the maximum range.", "range");
var rangeCount = range.Max - range.Min + 1;
return Enumerable.Range(range.Min, rangeCount)
.Select(num =>
multiplesToDouble.Any(multiple => num % multiple == 0)
? num * 2
: num)
.Sum();
}