public void IsWholeNumber_IsValidResultNegative()
{
// arrange
Fraction fraction1 = new Fraction(-3);
Fraction fraction2 = new Fraction(-3, 4);
Fraction fraction3 = new Fraction(-3, 2, 5);
Boolean expected1 = true;
Boolean expected2 = false;
Boolean expected3 = false;
// action
Boolean actual1 = fraction1.IsWholeNumber();
Boolean actual2 = fraction2.IsWholeNumber();
Boolean actual3 = fraction3.IsWholeNumber();
// assert
Assert.AreEqual(expected1, actual1, "Invalid result with one argument; negative whole number.");
Assert.AreEqual(expected2, actual2, "Invalid result with two arguments; negative fraction.");
Assert.AreEqual(expected3, actual3, "Invalid result with three arguments; negative mixed number.");
}
/// <summary>
/// MakeImproper - converts a mixed fraction or whole number to an improper fraction.
/// </summary>
/// <param name="fraction">Fraction to to convert.</param>
/// <returns>Proper or Improper Fraction.</returns>
public static Fraction MakeImproper(Fraction fraction)
{
// Check for mixed number fractions
if (fraction.IsMixedNumber()){
// Check whole part for negative sign
if(fraction.WholePart < 0)
{
// Convert a mixed number fraction to an improper fraction
return new Fraction( -1 * (fraction.Denominator * Math.Abs(fraction.WholePart) + fraction.Numerator), fraction.Denominator);
}
else
{
// Convert a mixed number fraction to an improper fraction
return new Fraction((fraction.Denominator * fraction.WholePart) + fraction.Numerator, fraction.Denominator);
}
} else if (fraction.IsWholeNumber()) {
// Convert a whole number to an improper fraction
return new Fraction(fraction.WholePart, 1);
} else {
// If not improper fraction, return original fraction
return new Fraction(fraction.Numerator, fraction.Denominator);
}
}
/// <summary>
/// MakeDecimal - provides the "decimal" version of a fraction.
/// </summary>
/// <param name="fraction"></param>
/// <returns>Decimal</returns>
public static decimal MakeDecimal(Fraction fraction)
{
Fraction prepFraction;
if(fraction.IsWholeNumber())
{ // whole number
return (decimal)fraction.WholePart;
}
else
{ // fractions
// Convert fractions to improper fraction format (returns the same fraction if it's proper fraction.)
prepFraction = FractionOperations.MakeImproper(fraction);
return ((decimal)prepFraction.Numerator / (decimal)prepFraction.Denominator);
}
}
