/// <summary>
/// The GetHalfTablespoons method gets the greatest number of half tablespoons
/// that can be formed from given number of teaspoons
/// </summary>
/// <param name="teaspoons">Fraction representing number of teaspoons</param>
/// <returns>Greatest number of half tablespoons that can be formed</returns>
private static int GetHalfTablespoons(Fraction teaspoons)
{
//equivelant of teaspoons/number_of_teaspoons_per_half_teaspoon, but need Fraction's div
//method because they are both fractions
return(Fraction.Div(teaspoons.Copy(), new Fraction(3, 2)));
}
/// <summary>
/// The Subtract method subtracts a Fraction from the NonNegativeFraction
/// If the passed Fraction would cause the NonNegativeFraction to be negative, throws an ArgumentOutOfRangeException
/// </summary>
/// <param name="fraction">Fraction to subtract</param>
protected override void Subtract(Fraction fraction)
{
fraction = fraction.Copy();
fraction *= -1;
Add(fraction);
}