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Contents
using System;
using System.Linq;
public enum TriangleKind
{
Equilateral,
Isosceles,
Scalene
}
public class Triangle
{
public static TriangleKind Kind(decimal side1, decimal side2, decimal side3)
{
if (AllSidesAreZero(side1, side2, side3) ||
HasImpossibleSides(side1, side2, side3) ||
ViolatesTriangleInequality(side1, side2, side3))
{
throw new TriangleException();
}
int uniqueSides = UniqueSides(side1, side2, side3);
if (uniqueSides == 1)
return TriangleKind.Equilateral;
if (uniqueSides == 2)
return TriangleKind.Isosceles;
return TriangleKind.Scalene;
}
private static bool AllSidesAreZero(decimal side1, decimal side2, decimal side3)
{
return side1 == 0 && side2 == 0 && side3 == 0;
}
private static bool HasImpossibleSides(decimal side1, decimal side2, decimal side3)
{
return side1 < 0 || side2 < 0 || side3 < 0;
}
private static bool ViolatesTriangleInequality(decimal side1, decimal side2, decimal side3)
{
return side1 + side2 <= side3 || side1 + side3 <= side2 || side2 + side3 <= side1;
}
private static int UniqueSides(decimal side1, decimal side2, decimal side3)
{
decimal[] sides = { side1, side2, side3 };
return sides.Distinct().Count();
}
}
public class TriangleException : Exception { }
Version data entries
115 entries across 115 versions & 1 rubygems