private int FindSumOfShortestSides(Triangle givenTriangle)
{
int sum = 0;
int longest = FindLengthOfLongestSide(givenTriangle);
int[] sides = { givenTriangle.Length0, givenTriangle.Length1, givenTriangle.Length2, };
for (int idx = 0; idx < sides.Length; sum += sides[idx++]) ;
sum -= longest;
return sum;
}
private int FindLengthOfLongestSide(Triangle givenTriangle)
{
int longest = -1;
int[] sides = { givenTriangle.Length0, givenTriangle.Length1, givenTriangle.Length2, };
for (int idx = 0; idx < sides.Length; idx++)
{
if (longest < sides[idx]) longest = sides[idx];
}
return longest;
}
public void TestEquilateralDetection()
{
//setup
int l0, l1, l2;
l0 = l1 = l2 = 5;
TriangleType expectedType = TriangleType.EQUILATERAL;
Triangle givenTriangle = new Triangle(l0, l1, l2);
//execute
TriangleType actualType = new Classifier().Classify(givenTriangle);
//assert
Assert.AreEqual(expectedType, actualType, "A triangle with 3 equal length sides is always equilateral");
}
public TriangleType Classify(Triangle givenTriangle)
{
TriangleType type = TriangleType.INVALID;
if (givenTriangle != null)
{
if (!Validate(givenTriangle))
{
type = TriangleType.INVALID;
}
else if (givenTriangle.Length0 != 0
&& givenTriangle.Length1 != 0
&& givenTriangle.Length2 != 0)
{
int l0, l1, l2;
l0 = givenTriangle.Length0;
l1 = givenTriangle.Length1;
l2 = givenTriangle.Length2;
if (l0 == l1 && l1 == l2)
{
type = TriangleType.EQUILATERAL;
}
else if (l0 == l1 || l0 == l2 || l1 == l2)
{
type = TriangleType.ISOSCELES;
}
else
{
type = TriangleType.SCALENE;
}
}
else
{
float a0, a1, a2;
a0 = givenTriangle.Angle0;
a1 = givenTriangle.Angle1;
a2 = givenTriangle.Angle2;
if (a0 == NINTY || a1 == NINTY || a2 == NINTY)
{
type = TriangleType.RIGHT;
}
else if (a0 > NINTY || a1 > NINTY || a2 > NINTY)
{
type = TriangleType.OBTUSE;
}
else
{
type = TriangleType.ACUTE;
}
}
}
return type;
}
public void TestIsoscelesDetection()
{
//setup
int l0, l1, l2;
l0 = l1 = 5;
l2 = 3;
TriangleType expectedType = TriangleType.ISOSCELES;
Triangle givenTriangle = new Triangle(l0, l1, l2);
//execute
TriangleType actualType = new Classifier().Classify(givenTriangle);
//assert
Assert.AreEqual(expectedType, actualType, "A triangle with 2 equal length sides is always isosceles");
}
public void TestRightDetection()
{
//setup
float a0, a1, a2;
a0 = 90.0f;
a1 = 45.0f;
a2 = 45.0f;
TriangleType expectedType = TriangleType.RIGHT;
Triangle givenTriangle = new Triangle(a0, a1, a2);
//execute
TriangleType actualType = new Classifier().Classify(givenTriangle);
//assert
Assert.AreEqual(expectedType, actualType, "A triangle with 1 90 degrees angle is always right");
}
public void TestObtuseDetection()
{
//setup
float a0, a1, a2;
a0 = 100.0f;
a1 = 40.0f;
a2 = 40.0f;
TriangleType expectedType = TriangleType.OBTUSE;
Triangle givenTriangle = new Triangle(a0, a1, a2);
//execute
TriangleType actualType = new Classifier().Classify(givenTriangle);
//assert
Assert.AreEqual(expectedType, actualType, "A triangle with 1 angle > 90 degrees is always obtuse");
}
public void TestAcuteDetection()
{
//setup
float a0, a1, a2;
a0 = 80.0f;
a1 = 50.0f;
a2 = 50.0f;
TriangleType expectedType = TriangleType.ACUTE;
Triangle givenTriangle = new Triangle(a0, a1, a2);
//execute
TriangleType actualType = new Classifier().Classify(givenTriangle);
//assert
Assert.AreEqual(expectedType, actualType, "A triangle with no angle >= 90 degrees is always acute");
}
private bool Validate(Triangle givenTriangle)
{
bool valid = true;
float sumOfAngles = givenTriangle.Angle0 + givenTriangle.Angle1 + givenTriangle.Angle2;
valid &= sumOfAngles == 0.0f || sumOfAngles == 180.0f;
valid &= (givenTriangle.Length0 != 0 && givenTriangle.Length1 != 0 && givenTriangle.Length2 != 0) ||
(givenTriangle.Length0 == 0 && givenTriangle.Length1 == 0 && givenTriangle.Length2 == 0);
valid &= FindLengthOfLongestSide(givenTriangle) < FindSumOfShortestSides(givenTriangle) ||
(givenTriangle.Length0 == 0 && givenTriangle.Length1 == 0 && givenTriangle.Length2 == 0);
return valid;
}
public void TestScaleneDetection()
{
//setup
int l0, l1, l2;
l0 = 2;
l1 = 4;
l2 = 3;
TriangleType expectedType = TriangleType.SCALENE;
Triangle givenTriangle = new Triangle(l0, l1, l2);
//execute
TriangleType actualType = new Classifier().Classify(givenTriangle);
//assert
Assert.AreEqual(expectedType, actualType, "A triangle with no equal length sides is always scalene");
}
public void TestValidationZeroLengthSides()
{
//setup
int l0, l1, l2;
l0 = 0;
l1 = 5;
l2 = 3;
TriangleType expectedType = TriangleType.INVALID;
Triangle givenTriangle = new Triangle(l0, l1, l2);
//execute
TriangleType actualType = new Classifier().Classify(givenTriangle);
//assert
Assert.AreEqual(expectedType, actualType, "A triangle cannot have a zero length side");
}
public void TestValidationTooMuchAngle()
{
//setup
float a0, a1, a2;
a0 = 91.0f;
a1 = 45.0f;
a2 = 45.0f;
TriangleType expectedType = TriangleType.INVALID;
Triangle givenTriangle = new Triangle(a0, a1, a2);
//execute
TriangleType actualType = new Classifier().Classify(givenTriangle);
//assert
Assert.AreEqual(expectedType, actualType, "A triangle cannot have a total of all angles greater than 180 degrees");
}
public void TestValidationShortSide()
{
//setup
int l0, l1, l2;
l0 = 9;
l1 = 5;
l2 = 3;
TriangleType expectedType = TriangleType.INVALID;
Triangle givenTriangle = new Triangle(l0, l1, l2);
//execute
TriangleType actualType = new Classifier().Classify(givenTriangle);
//assert
Assert.AreEqual(expectedType, actualType, "A triangle's longest side cannot be longer than the sum of the two shorter sides");
}
