public void IsMixedNumber_ValidResultNegative()
{
// arrange
Fraction fraction1 = new Fraction(-3);
Fraction fraction2 = new Fraction(-3, 4);
Fraction fraction3 = new Fraction(-3, 2, 5);
Boolean expected1 = false;
Boolean expected2 = false;
Boolean expected3 = true;
// action
Boolean actual1 = fraction1.IsMixedNumber();
Boolean actual2 = fraction2.IsMixedNumber();
Boolean actual3 = fraction3.IsMixedNumber();
// assert
Assert.AreEqual(expected1, actual1, "Invalid result with one argument, negative whole number.");
Assert.AreEqual(expected2, actual2, "Invalid result with two arguments, negative proper 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);
}
}